Add GPT-4o mini support (#2102)

Reference:
- https://platform.openai.com/docs/models/gpt-4o-mini
- https://openai.com/index/gpt-4o-mini-advancing-cost-efficient-intelligence/

README.md

@@ -216,7 +216,7 @@ services:
       # API interface address, optional, available when OPENAI_API_KEY is set
       OPENAI_API_BASE_URL: xxx
       # API model, optional, available when OPENAI_API_KEY is set, https://platform.openai.com/docs/models
-      # gpt-4, gpt-4o, gpt-4-turbo, gpt-4-turbo-preview, gpt-4-0125-preview, gpt-4-1106-preview, gpt-4-0314, gpt-4-0613, gpt-4-32k, gpt-4-32k-0314, gpt-4-32k-0613, gpt-3.5-turbo-16k, gpt-3.5-turbo-16k-0613, gpt-3.5-turbo, gpt-3.5-turbo-0301, gpt-3.5-turbo-0613, text-davinci-003, text-davinci-002, code-davinci-002
+      # gpt-4, gpt-4o, gpt-4o-mini, gpt-4-turbo, gpt-4-turbo-preview, gpt-4-0125-preview, gpt-4-1106-preview, gpt-4-0314, gpt-4-0613, gpt-4-32k, gpt-4-32k-0314, gpt-4-32k-0613, gpt-3.5-turbo-16k, gpt-3.5-turbo-16k-0613, gpt-3.5-turbo, gpt-3.5-turbo-0301, gpt-3.5-turbo-0613, text-davinci-003, text-davinci-002, code-davinci-002
       OPENAI_API_MODEL: xxx
       # reverse proxy, optional
       API_REVERSE_PROXY: xxx

README.zh.md

@@ -220,7 +220,7 @@ services:
       # API接口地址，可选，设置 OPENAI_API_KEY 时可用
       OPENAI_API_BASE_URL: xxx
       # API模型，可选，设置 OPENAI_API_KEY 时可用，https://platform.openai.com/docs/models
-      # gpt-4, gpt-4o, gpt-4-turbo, gpt-4-turbo-preview, gpt-4-0125-preview, gpt-4-1106-preview, gpt-4-0314, gpt-4-0613, gpt-4-32k, gpt-4-32k-0314, gpt-4-32k-0613, gpt-3.5-turbo-16k, gpt-3.5-turbo-16k-0613, gpt-3.5-turbo, gpt-3.5-turbo-0301, gpt-3.5-turbo-0613, text-davinci-003, text-davinci-002, code-davinci-002
+      # gpt-4, gpt-4o, gpt-4o-mini, gpt-4-turbo, gpt-4-turbo-preview, gpt-4-0125-preview, gpt-4-1106-preview, gpt-4-0314, gpt-4-0613, gpt-4-32k, gpt-4-32k-0314, gpt-4-32k-0613, gpt-3.5-turbo-16k, gpt-3.5-turbo-16k-0613, gpt-3.5-turbo, gpt-3.5-turbo-0301, gpt-3.5-turbo-0613, text-davinci-003, text-davinci-002, code-davinci-002
       OPENAI_API_MODEL: xxx
       # 反向代理，可选
       API_REVERSE_PROXY: xxx

service/src/chatgpt/index.ts

@@ -53,6 +53,10 @@ let api: ChatGPTAPI | ChatGPTUnofficialProxyAPI
         options.maxModelTokens = 32768
         options.maxResponseTokens = 8192
       }
+      else if (/-4o-mini/.test(model.toLowerCase())) {
+        options.maxModelTokens = 128000
+        options.maxResponseTokens = 16384
+      }
       // if use GPT-4 Turbo or GPT-4o
       else if (/-preview|-turbo|o/.test(model.toLowerCase())) {
         options.maxModelTokens = 128000