diff --git a/lib/new_relic/agent.rb b/lib/new_relic/agent.rb
index cc93bdd18f..02a91595b0 100644
--- a/lib/new_relic/agent.rb
+++ b/lib/new_relic/agent.rb
@@ -62,6 +62,7 @@ module Agent
     require 'new_relic/agent/attribute_processing'
     require 'new_relic/agent/linking_metadata'
     require 'new_relic/agent/local_log_decorator'
+    require 'new_relic/agent/llm'
 
     require 'new_relic/agent/instrumentation/controller_instrumentation'
 
diff --git a/lib/new_relic/agent/llm.rb b/lib/new_relic/agent/llm.rb
new file mode 100644
index 0000000000..3057d635a1
--- /dev/null
+++ b/lib/new_relic/agent/llm.rb
@@ -0,0 +1,11 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+require_relative 'llm/llm_event'
+require_relative 'llm/chat_completion'
+require_relative 'llm/chat_completion_message'
+require_relative 'llm/chat_completion_summary'
+require_relative 'llm/embedding'
+require_relative 'llm/feedback'
+require_relative 'llm/response_headers'
diff --git a/lib/new_relic/agent/llm/chat_completion.rb b/lib/new_relic/agent/llm/chat_completion.rb
new file mode 100644
index 0000000000..ca24221135
--- /dev/null
+++ b/lib/new_relic/agent/llm/chat_completion.rb
@@ -0,0 +1,15 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+module NewRelic
+  module Agent
+    module Llm
+      module ChatCompletion
+        ATTRIBUTES = %i[conversation_id]
+
+        attr_accessor(*ATTRIBUTES)
+      end
+    end
+  end
+end
diff --git a/lib/new_relic/agent/llm/chat_completion_message.rb b/lib/new_relic/agent/llm/chat_completion_message.rb
new file mode 100644
index 0000000000..eca258e1ad
--- /dev/null
+++ b/lib/new_relic/agent/llm/chat_completion_message.rb
@@ -0,0 +1,26 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+module NewRelic
+  module Agent
+    module Llm
+      class ChatCompletionMessage < LlmEvent
+        include ChatCompletion
+
+        ATTRIBUTES = %i[content role sequence completion_id is_response]
+        EVENT_NAME = 'LlmChatCompletionMessage'
+
+        attr_accessor(*ATTRIBUTES)
+
+        def attributes
+          LlmEvent::ATTRIBUTES + ChatCompletion::ATTRIBUTES + ATTRIBUTES
+        end
+
+        def event_name
+          EVENT_NAME
+        end
+      end
+    end
+  end
+end
diff --git a/lib/new_relic/agent/llm/chat_completion_summary.rb b/lib/new_relic/agent/llm/chat_completion_summary.rb
new file mode 100644
index 0000000000..15fa09e493
--- /dev/null
+++ b/lib/new_relic/agent/llm/chat_completion_summary.rb
@@ -0,0 +1,33 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+require_relative 'response_headers'
+
+module NewRelic
+  module Agent
+    module Llm
+      class ChatCompletionSummary < LlmEvent
+        include ChatCompletion
+        include ResponseHeaders
+
+        ATTRIBUTES = %i[api_key_last_four_digits request_max_tokens
+          response_number_of_messages request_model response_organization
+          response_usage_total_tokens response_usage_prompt_tokens
+          response_usage_completion_tokens response_choices_finish_reason
+          request_temperature duration error]
+        EVENT_NAME = 'LlmChatCompletionSummary'
+
+        attr_accessor(*ATTRIBUTES)
+
+        def attributes
+          LlmEvent::ATTRIBUTES + ChatCompletion::ATTRIBUTES + ResponseHeaders::ATTRIBUTES + ATTRIBUTES
+        end
+
+        def event_name
+          EVENT_NAME
+        end
+      end
+    end
+  end
+end
diff --git a/lib/new_relic/agent/llm/embedding.rb b/lib/new_relic/agent/llm/embedding.rb
new file mode 100644
index 0000000000..773831211f
--- /dev/null
+++ b/lib/new_relic/agent/llm/embedding.rb
@@ -0,0 +1,28 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+module NewRelic
+  module Agent
+    module Llm
+      class Embedding < LlmEvent
+        include ResponseHeaders
+
+        ATTRIBUTES = %i[input api_key_last_four_digits request_model
+          response_organization response_usage_total_tokens
+          response_usage_prompt_tokens duration error]
+        EVENT_NAME = 'LlmEmbedding'
+
+        attr_accessor(*ATTRIBUTES)
+
+        def attributes
+          LlmEvent::ATTRIBUTES + ResponseHeaders::ATTRIBUTES + ATTRIBUTES
+        end
+
+        def event_name
+          EVENT_NAME
+        end
+      end
+    end
+  end
+end
diff --git a/lib/new_relic/agent/llm/feedback.rb b/lib/new_relic/agent/llm/feedback.rb
new file mode 100644
index 0000000000..225a398eb0
--- /dev/null
+++ b/lib/new_relic/agent/llm/feedback.rb
@@ -0,0 +1,12 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+module NewRelic
+  module Agent
+    module Llm
+      class Feedback < LlmEvent
+      end
+    end
+  end
+end
diff --git a/lib/new_relic/agent/llm/llm_event.rb b/lib/new_relic/agent/llm/llm_event.rb
new file mode 100644
index 0000000000..7869e7fa70
--- /dev/null
+++ b/lib/new_relic/agent/llm/llm_event.rb
@@ -0,0 +1,59 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+module NewRelic
+  module Agent
+    module Llm
+      class LlmEvent
+        # Every subclass must define its own ATTRIBUTES constant, an array of symbols representing
+        # that class's unique attributes
+        ATTRIBUTES = %i[id request_id span_id transaction_id
+          trace_id response_model vendor ingest_source]
+        # These attributes should not be passed as arguments to initialize and will be set by the agent
+        AGENT_DEFINED_ATTRIBUTES = %i[span_id transaction_id trace_id ingest_source]
+        INGEST_SOURCE = 'Ruby'
+
+        attr_accessor(*ATTRIBUTES)
+
+        # This initialize method is used for all subclasses.
+        # It leverages the subclass's `attributes` method to iterate through
+        # all the attributes for that subclass.
+        # It assigns instance variables for all arguments passed to the method.
+        # It also assigns agent-defined attributes.
+        def initialize(opts = {})
+          (attributes - AGENT_DEFINED_ATTRIBUTES).each do |attr|
+            instance_variable_set(:"@#{attr}", opts[attr]) if opts.key?(attr)
+          end
+
+          @span_id = NewRelic::Agent::Tracer.current_span_id
+          @transaction_id = NewRelic::Agent::Tracer.current_transaction&.guid
+          @trace_id = NewRelic::Agent::Tracer.current_trace_id
+          @ingest_source = INGEST_SOURCE
+        end
+
+        # All subclasses use event_attributes to get a full hash of all
+        # attributes and their values
+        def event_attributes
+          attributes.each_with_object({}) do |attr, hash|
+            hash[attr] = instance_variable_get(:"@#{attr}")
+          end
+        end
+
+        # Subclasses define an attributes method to concatenate attributes
+        # defined across their ancestors and other modules
+        def attributes
+          ATTRIBUTES
+        end
+
+        # Subclasses that record events will override this method
+        def event_name
+        end
+
+        def record
+          NewRelic::Agent.record_custom_event(event_name, event_attributes)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/new_relic/agent/llm/response_headers.rb b/lib/new_relic/agent/llm/response_headers.rb
new file mode 100644
index 0000000000..892b7a1cf4
--- /dev/null
+++ b/lib/new_relic/agent/llm/response_headers.rb
@@ -0,0 +1,36 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+module NewRelic
+  module Agent
+    module Llm
+      module ResponseHeaders
+        ATTRIBUTES = %i[llm_version rate_limit_requests rate_limit_tokens
+          rate_limit_remaining_requests rate_limit_remaining_tokens
+          rate_limit_reset_requests rate_limit_reset_tokens]
+
+        OPENAI_VERSION = 'openai-version'
+        X_RATELIMIT_LIMIT_REQUESTS = 'x-ratelimit-limit-requests'
+        X_RATELIMIT_LIMIT_TOKENS = 'x-ratelimit-limit-tokens'
+        X_RATELIMIT_REMAINING_REQUESTS = 'x-ratelimit-remaining-requests'
+        X_RATELIMIT_REMAINING_TOKENS = 'x-ratelimit-remaining-tokens'
+        X_RATELIMIT_RESET_REQUESTS = 'x-ratelimit-reset-requests'
+        X_RATELIMIT_RESET_TOKENS = 'x-ratelimit-reset-tokens'
+
+        attr_accessor(*ATTRIBUTES)
+
+        # Headers is a hash of Net::HTTP response headers
+        def populate_openai_response_headers(headers)
+          self.llm_version = headers[OPENAI_VERSION]&.first
+          self.rate_limit_requests = headers[X_RATELIMIT_LIMIT_REQUESTS]&.first
+          self.rate_limit_tokens = headers[X_RATELIMIT_LIMIT_TOKENS]&.first
+          self.rate_limit_remaining_requests = headers[X_RATELIMIT_REMAINING_REQUESTS]&.first
+          self.rate_limit_remaining_tokens = headers[X_RATELIMIT_REMAINING_TOKENS]&.first
+          self.rate_limit_reset_requests = headers[X_RATELIMIT_RESET_REQUESTS]&.first
+          self.rate_limit_reset_tokens = headers[X_RATELIMIT_RESET_TOKENS]&.first
+        end
+      end
+    end
+  end
+end
diff --git a/test/new_relic/agent/llm/chat_completion_message_test.rb b/test/new_relic/agent/llm/chat_completion_message_test.rb
new file mode 100644
index 0000000000..7695b6fc91
--- /dev/null
+++ b/test/new_relic/agent/llm/chat_completion_message_test.rb
@@ -0,0 +1,90 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+require_relative '../../../test_helper'
+
+module NewRelic::Agent::Llm
+  class ChatCompletionMessageTest < Minitest::Test
+    def test_attributes_assigned_by_parent_present
+      assert_includes NewRelic::Agent::Llm::ChatCompletionMessage.ancestors, NewRelic::Agent::Llm::LlmEvent
+      assert_includes NewRelic::Agent::Llm::LlmEvent::AGENT_DEFINED_ATTRIBUTES, :transaction_id
+
+      in_transaction do |txn|
+        event = NewRelic::Agent::Llm::ChatCompletionMessage.new
+
+        assert_equal txn.guid, event.transaction_id
+      end
+    end
+
+    def test_attributes_in_parent_list_can_be_assigned_on_init
+      assert_includes NewRelic::Agent::Llm::LlmEvent::ATTRIBUTES, :id
+
+      event = NewRelic::Agent::Llm::ChatCompletionMessage.new(id: 123)
+
+      assert_equal 123, event.id
+    end
+
+    def test_included_module_attributes_list_can_be_assigned_on_init
+      assert_includes NewRelic::Agent::Llm::ChatCompletionMessage.ancestors, NewRelic::Agent::Llm::ChatCompletion
+      assert_includes NewRelic::Agent::Llm::ChatCompletion::ATTRIBUTES, :conversation_id
+
+      conversation_id = '123abc'
+      event = NewRelic::Agent::Llm::ChatCompletionMessage.new(conversation_id: conversation_id)
+
+      assert_equal conversation_id, event.conversation_id
+    end
+
+    def test_attributes_constant_values_can_be_passed_as_args_and_set_on_init
+      assert_includes NewRelic::Agent::Llm::ChatCompletionMessage::ATTRIBUTES, :role
+      role = 'user'
+      event = NewRelic::Agent::Llm::ChatCompletionMessage.new(role: role)
+
+      assert_equal role, event.role
+    end
+
+    def test_args_passed_to_init_not_set_as_instance_vars_when_not_in_attributes_constant
+      event = NewRelic::Agent::Llm::ChatCompletionMessage.new(fake: 'fake')
+
+      refute_includes event.attributes, :fake
+      refute event.instance_variable_defined?(:@fake)
+    end
+
+    def test_record_creates_an_event
+      in_transaction do |txn|
+        message = NewRelic::Agent::Llm::ChatCompletionMessage.new(
+          id: 7, content: 'Red-Tailed Hawk'
+        )
+        message.sequence = 2
+        message.conversation_id = 25
+        message.request_id = '789'
+        message.response_model = 'gpt-4'
+        message.vendor = 'OpenAI'
+        message.role = 'system'
+        message.completion_id = 123
+        message.is_response = 'true'
+
+        message.record
+        _, events = NewRelic::Agent.agent.custom_event_aggregator.harvest!
+        type, attributes = events[0]
+
+        assert_equal 'LlmChatCompletionMessage', type['type']
+
+        assert_equal 7, attributes['id']
+        assert_equal 25, attributes['conversation_id']
+        assert_equal '789', attributes['request_id']
+        assert_equal txn.current_segment.guid, attributes['span_id']
+        assert_equal txn.guid, attributes['transaction_id']
+        assert_equal txn.trace_id, attributes['trace_id']
+        assert_equal 'gpt-4', attributes['response_model']
+        assert_equal 'OpenAI', attributes['vendor']
+        assert_equal 'Ruby', attributes['ingest_source']
+        assert_equal 'Red-Tailed Hawk', attributes['content']
+        assert_equal 'system', attributes['role']
+        assert_equal 2, attributes['sequence']
+        assert_equal 123, attributes['completion_id']
+        assert_equal 'true', attributes['is_response']
+      end
+    end
+  end
+end
diff --git a/test/new_relic/agent/llm/chat_completion_summary_test.rb b/test/new_relic/agent/llm/chat_completion_summary_test.rb
new file mode 100644
index 0000000000..f496346a4e
--- /dev/null
+++ b/test/new_relic/agent/llm/chat_completion_summary_test.rb
@@ -0,0 +1,119 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+require_relative '../../../test_helper'
+
+module NewRelic::Agent::Llm
+  class ChatCompletionSummaryTest < Minitest::Test
+    def test_attributes_assigned_by_parent_present
+      assert_includes NewRelic::Agent::Llm::ChatCompletionSummary.ancestors, NewRelic::Agent::Llm::LlmEvent
+      assert_includes NewRelic::Agent::Llm::LlmEvent::AGENT_DEFINED_ATTRIBUTES, :transaction_id
+
+      in_transaction do |txn|
+        event = NewRelic::Agent::Llm::ChatCompletionSummary.new
+
+        assert_equal txn.guid, event.transaction_id
+      end
+    end
+
+    def test_attributes_in_parent_list_can_be_assigned_on_init
+      assert_includes NewRelic::Agent::Llm::LlmEvent::ATTRIBUTES, :id
+
+      event = NewRelic::Agent::Llm::ChatCompletionSummary.new(id: 123)
+
+      assert_equal 123, event.id
+    end
+
+    def test_included_module_attributes_list_can_be_assigned_on_init
+      assert_includes NewRelic::Agent::Llm::ChatCompletionSummary.ancestors, NewRelic::Agent::Llm::ChatCompletion
+      assert_includes NewRelic::Agent::Llm::ChatCompletion::ATTRIBUTES, :conversation_id
+
+      conversation_id = '123abc'
+      event = NewRelic::Agent::Llm::ChatCompletionSummary.new(conversation_id: conversation_id)
+
+      assert_equal conversation_id, event.conversation_id
+    end
+
+    def test_attributes_constant_values_can_be_passed_as_args_and_set_on_init
+      assert_includes NewRelic::Agent::Llm::ChatCompletionSummary::ATTRIBUTES, :request_model
+      request_model = 'gpt-4-turbo-preview'
+      event = NewRelic::Agent::Llm::ChatCompletionSummary.new(request_model: request_model)
+
+      assert_equal request_model, event.request_model
+    end
+
+    def test_args_passed_to_init_not_set_as_instance_vars_when_not_in_attributes_constant
+      event = NewRelic::Agent::Llm::ChatCompletionSummary.new(fake: 'fake')
+
+      refute_includes event.attributes, :fake
+      refute event.instance_variable_defined?(:@fake)
+    end
+
+    def test_record_creates_an_event
+      in_transaction do |txn|
+        summary = NewRelic::Agent::Llm::ChatCompletionSummary.new(
+          id: 123,
+          request_model: 'gpt-4-turbo-preview',
+          api_key_last_four_digits: 'sk-0713'
+        )
+        summary.request_id = '789'
+        summary.conversation_id = 456
+        summary.response_usage_total_tokens = 20
+        summary.request_max_tokens = 500
+        summary.response_number_of_messages = 5
+        summary.request_model = 'gpt-4-turbo-preview'
+        summary.response_model = 'gpt-4'
+        summary.response_organization = '98338'
+        summary.response_usage_total_tokens = 20
+        summary.response_usage_prompt_tokens = '24'
+        summary.response_usage_completion_tokens = '26'
+        summary.response_choices_finish_reason = 'stop'
+        summary.vendor = 'OpenAI'
+        summary.duration = '500'
+        summary.error = 'true'
+        summary.llm_version = '2022-01-01'
+        summary.rate_limit_requests = '100'
+        summary.rate_limit_tokens = '101'
+        summary.rate_limit_reset_tokens = '102'
+        summary.rate_limit_reset_requests = '103'
+        summary.rate_limit_remaining_tokens = '104'
+        summary.rate_limit_remaining_requests = '105'
+
+        summary.record
+        _, events = NewRelic::Agent.agent.custom_event_aggregator.harvest!
+        type, attributes = events[0]
+
+        assert_equal 'LlmChatCompletionSummary', type['type']
+
+        assert_equal 123, attributes['id']
+        assert_equal 456, attributes['conversation_id']
+        assert_equal '789', attributes['request_id']
+        assert_equal txn.current_segment.guid, attributes['span_id']
+        assert_equal txn.guid, attributes['transaction_id']
+        assert_equal txn.trace_id, attributes['trace_id']
+        assert_equal 'sk-0713', attributes['api_key_last_four_digits']
+        assert_equal 500, attributes['request_max_tokens']
+        assert_equal 5, attributes['response_number_of_messages']
+        assert_equal 'gpt-4-turbo-preview', attributes['request_model']
+        assert_equal 'gpt-4', attributes['response_model']
+        assert_equal '98338', attributes['response_organization']
+        assert_equal 20, attributes['response_usage_total_tokens']
+        assert_equal '24', attributes['response_usage_prompt_tokens']
+        assert_equal '26', attributes['response_usage_completion_tokens']
+        assert_equal 'stop', attributes['response_choices_finish_reason']
+        assert_equal 'OpenAI', attributes['vendor']
+        assert_equal 'Ruby', attributes['ingest_source']
+        assert_equal '500', attributes['duration']
+        assert_equal 'true', attributes['error']
+        assert_equal '2022-01-01', attributes['llm_version']
+        assert_equal '100', attributes['rate_limit_requests']
+        assert_equal '101', attributes['rate_limit_tokens']
+        assert_equal '102', attributes['rate_limit_reset_tokens']
+        assert_equal '103', attributes['rate_limit_reset_requests']
+        assert_equal '104', attributes['rate_limit_remaining_tokens']
+        assert_equal '105', attributes['rate_limit_remaining_requests']
+      end
+    end
+  end
+end
diff --git a/test/new_relic/agent/llm/chat_completion_test.rb b/test/new_relic/agent/llm/chat_completion_test.rb
new file mode 100644
index 0000000000..0bfbb39b37
--- /dev/null
+++ b/test/new_relic/agent/llm/chat_completion_test.rb
@@ -0,0 +1,13 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+require_relative '../../../test_helper'
+
+module NewRelic::Agent::Llm
+  class ChatCompletionTest < Minitest::Test
+    def test_attributes_include_conversation_id
+      assert_includes ChatCompletion::ATTRIBUTES, :conversation_id
+    end
+  end
+end
diff --git a/test/new_relic/agent/llm/embedding_test.rb b/test/new_relic/agent/llm/embedding_test.rb
new file mode 100644
index 0000000000..e10eceadca
--- /dev/null
+++ b/test/new_relic/agent/llm/embedding_test.rb
@@ -0,0 +1,95 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+require_relative '../../../test_helper'
+
+module NewRelic::Agent::Llm
+  class EmbeddingTest < Minitest::Test
+    def test_attributes_assigned_by_parent_present
+      assert_includes NewRelic::Agent::Llm::Embedding.ancestors, NewRelic::Agent::Llm::LlmEvent
+      assert_includes NewRelic::Agent::Llm::LlmEvent::AGENT_DEFINED_ATTRIBUTES, :transaction_id
+
+      in_transaction do |txn|
+        event = NewRelic::Agent::Llm::Embedding.new
+
+        assert_equal txn.guid, event.transaction_id
+      end
+    end
+
+    def test_attributes_in_parent_list_can_be_assigned_on_init
+      assert_includes NewRelic::Agent::Llm::LlmEvent::ATTRIBUTES, :id
+
+      event = NewRelic::Agent::Llm::Embedding.new(id: 123)
+
+      assert_equal 123, event.id
+    end
+
+    def test_attributes_constant_values_can_be_passed_as_args_and_set_on_init
+      assert_includes NewRelic::Agent::Llm::Embedding::ATTRIBUTES, :input
+      input = 'Salut!'
+      event = NewRelic::Agent::Llm::Embedding.new(input: input)
+
+      assert_equal input, event.input
+    end
+
+    def test_args_passed_to_init_not_set_as_instance_vars_when_not_in_attributes_constant
+      event = NewRelic::Agent::Llm::Embedding.new(fake: 'fake')
+
+      refute_includes event.attributes, :fake
+      refute event.instance_variable_defined?(:@fake)
+    end
+
+    def test_record_creates_an_event
+      in_transaction do |txn|
+        embedding = NewRelic::Agent::Llm::Embedding.new(input: 'Bonjour', request_model: 'text-embedding-ada-002', id: 123)
+        embedding.request_id = '789'
+        embedding.api_key_last_four_digits = 'sk-0126'
+        embedding.response_model = 'text-embedding-3-large'
+        embedding.response_organization = '98338'
+        embedding.response_usage_total_tokens = '20'
+        embedding.response_usage_prompt_tokens = '24'
+        embedding.vendor = 'OpenAI'
+        embedding.duration = '500'
+        embedding.error = 'true'
+        embedding.llm_version = '2022-01-01'
+        embedding.rate_limit_requests = '100'
+        embedding.rate_limit_tokens = '101'
+        embedding.rate_limit_reset_tokens = '102'
+        embedding.rate_limit_reset_requests = '103'
+        embedding.rate_limit_remaining_tokens = '104'
+        embedding.rate_limit_remaining_requests = '105'
+
+        embedding.record
+        _, events = NewRelic::Agent.agent.custom_event_aggregator.harvest!
+        type, attributes = events[0]
+
+        assert_equal 'LlmEmbedding', type['type']
+
+        assert_equal 123, attributes['id']
+        assert_equal '789', attributes['request_id']
+        assert_equal txn.current_segment.guid, attributes['span_id']
+        assert_equal txn.guid, attributes['transaction_id']
+        assert_equal txn.trace_id, attributes['trace_id']
+        assert_equal 'Bonjour', attributes['input']
+        assert_equal 'sk-0126', attributes['api_key_last_four_digits']
+        assert_equal 'text-embedding-ada-002', attributes['request_model']
+        assert_equal 'text-embedding-3-large', attributes['response_model']
+        assert_equal '98338', attributes['response_organization']
+        assert_equal '20', attributes['response_usage_total_tokens']
+        assert_equal '24', attributes['response_usage_prompt_tokens']
+        assert_equal 'OpenAI', attributes['vendor']
+        assert_equal 'Ruby', attributes['ingest_source']
+        assert_equal '500', attributes['duration']
+        assert_equal 'true', attributes['error']
+        assert_equal '2022-01-01', attributes['llm_version']
+        assert_equal '100', attributes['rate_limit_requests']
+        assert_equal '101', attributes['rate_limit_tokens']
+        assert_equal '102', attributes['rate_limit_reset_tokens']
+        assert_equal '103', attributes['rate_limit_reset_requests']
+        assert_equal '104', attributes['rate_limit_remaining_tokens']
+        assert_equal '105', attributes['rate_limit_remaining_requests']
+      end
+    end
+  end
+end
diff --git a/test/new_relic/agent/llm/feedback_test.rb b/test/new_relic/agent/llm/feedback_test.rb
new file mode 100644
index 0000000000..680d94ecbb
--- /dev/null
+++ b/test/new_relic/agent/llm/feedback_test.rb
@@ -0,0 +1,10 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+require_relative '../../../test_helper'
+
+module NewRelic::Agent::Llm
+  class FeedbackTest < Minitest::Test
+  end
+end
diff --git a/test/new_relic/agent/llm/llm_event_test.rb b/test/new_relic/agent/llm/llm_event_test.rb
new file mode 100644
index 0000000000..c69c121724
--- /dev/null
+++ b/test/new_relic/agent/llm/llm_event_test.rb
@@ -0,0 +1,51 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+require_relative '../../../test_helper'
+
+module NewRelic::Agent::Llm
+  class LlmEventTest < Minitest::Test
+    def test_agent_defined_attributes_set
+      assert_includes NewRelic::Agent::Llm::LlmEvent::AGENT_DEFINED_ATTRIBUTES, :transaction_id
+
+      in_transaction do |txn|
+        event = NewRelic::Agent::Llm::LlmEvent.new(transaction_id: 'fake')
+
+        refute_equal 'fake', event.transaction_id
+        assert_equal txn.guid, event.transaction_id
+      end
+    end
+
+    def test_attributes_constant_values_can_be_passed_as_args_and_set_on_init
+      id = 123
+      event = NewRelic::Agent::Llm::LlmEvent.new(id: id)
+
+      assert_equal id, event.id
+    end
+
+    def test_args_passed_to_init_not_set_as_instance_vars_when_not_in_attributes_constant
+      event = NewRelic::Agent::Llm::LlmEvent.new(fake: 'fake')
+
+      refute event.instance_variable_defined?(:@fake)
+    end
+
+    def test_event_attributes_returns_a_hash_of_assigned_attributes_and_values
+      event = NewRelic::Agent::Llm::LlmEvent.new(id: 123)
+      event.vendor = 'OpenAI'
+      result = event.event_attributes
+
+      assert_equal(result.keys, NewRelic::Agent::Llm::LlmEvent::ATTRIBUTES)
+      assert_equal(123, result[:id])
+      assert_equal('OpenAI', result[:vendor])
+    end
+
+    def test_record_does_not_create_an_event
+      event = NewRelic::Agent::Llm::LlmEvent.new
+      event.record
+      _, events = NewRelic::Agent.agent.custom_event_aggregator.harvest!
+
+      assert_empty events
+    end
+  end
+end
diff --git a/test/new_relic/agent/llm/response_headers_test.rb b/test/new_relic/agent/llm/response_headers_test.rb
new file mode 100644
index 0000000000..478ca21f7c
--- /dev/null
+++ b/test/new_relic/agent/llm/response_headers_test.rb
@@ -0,0 +1,54 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+require_relative '../../../test_helper'
+
+module NewRelic::Agent::Llm
+  class ResponseHeadersTest < Minitest::Test
+    def openai_response_headers_hash
+      # Response headers from a real OpenAI request
+      # rubocop:disable Style/StringLiterals, Style/WordArray
+      {"date" => ["Thu, 25 Jan 2024 23:16:44 GMT"],
+       "content-type" => ["application/json"],
+       "transfer-encoding" => ["chunked"],
+       "connection" => ["keep-alive"],
+       "access-control-allow-origin" => ["*"],
+       "openai-model" => ["text-embedding-ada-002"],
+       "openai-organization" =>
+      ["user-whatever"],
+       "openai-processing-ms" => ["22"],
+       "openai-version" => ["2020-10-01"],
+       "strict-transport-security" =>
+      ["max-age=15724800; includeSubDomains"],
+       "x-ratelimit-limit-requests" => ["200"],
+       "x-ratelimit-limit-tokens" => ["150000"],
+       "x-ratelimit-remaining-requests" => ["199"],
+       "x-ratelimit-remaining-tokens" => ["149990"],
+       "x-ratelimit-reset-requests" => ["7m12s"],
+       "x-ratelimit-reset-tokens" => ["4ms"],
+       "x-request-id" => ["123abc456"],
+       "cf-cache-status" => ["DYNAMIC"],
+       "set-cookie" =>
+      ["we-dont-use-this-value",
+        "we-dont-use-this-value"],
+       "server" => ["cloudflare"],
+       "cf-ray" => ["123abc-SJC"],
+       "alt-svc" => ["h3=\":443\"; ma=86400"]}
+      # rubocop:enable Style/StringLiterals, Style/WordArray
+    end
+
+    def test_populate_openai_response_headers
+      event = NewRelic::Agent::Llm::ChatCompletionSummary.new
+      event.populate_openai_response_headers(openai_response_headers_hash)
+
+      assert_equal '2020-10-01', event.llm_version
+      assert_equal '200', event.rate_limit_requests
+      assert_equal '150000', event.rate_limit_tokens
+      assert_equal '199', event.rate_limit_remaining_requests
+      assert_equal '149990', event.rate_limit_remaining_tokens
+      assert_equal '7m12s', event.rate_limit_reset_requests
+      assert_equal '4ms', event.rate_limit_reset_tokens
+    end
+  end
+end