Support OpenAI reasoning models with intelligent pattern detection

src/config/index.mjs

@@ -65,6 +65,10 @@ export const chatgptApiModelKeys = [
   'chatgptApi4_1',
   'chatgptApi4_1_mini',
   'chatgptApi4_1_nano',
+  'chatgptApiO4Mini',
+  'chatgptApiGpt5',
+  'chatgptApiGpt5Mini',
+  'chatgptApiGpt5Nano',
 ]
 export const customApiModelKeys = ['customModel']
 export const ollamaApiModelKeys = ['ollamaModel']
@@ -256,6 +260,11 @@ export const Models = {
   chatgptApi4_1_mini: { value: 'gpt-4.1-mini', desc: 'ChatGPT (GPT-4.1 mini)' },
   chatgptApi4_1_nano: { value: 'gpt-4.1-nano', desc: 'ChatGPT (GPT-4.1 nano)' },
 
+  chatgptApiO4Mini: { value: 'o4-mini', desc: 'ChatGPT (o4-mini)' },
+  chatgptApiGpt5: { value: 'gpt-5', desc: 'ChatGPT (gpt-5)' },
+  chatgptApiGpt5Mini: { value: 'gpt-5-mini', desc: 'ChatGPT (gpt-5-mini)' },
+  chatgptApiGpt5Nano: { value: 'gpt-5-nano', desc: 'ChatGPT (gpt-5-nano)' },
+
   claude2WebFree: { value: '', desc: 'Claude.ai (Web)' },
   claude12Api: { value: 'claude-instant-1.2', desc: 'Claude.ai (API, Claude Instant 1.2)' },
   claude2Api: { value: 'claude-2.0', desc: 'Claude.ai (API, Claude 2)' },
@@ -541,6 +550,10 @@ export const defaultConfig = {
     'openRouter_anthropic_claude_sonnet4',
     'openRouter_google_gemini_2_5_pro',
     'openRouter_openai_o3',
+    'chatgptApiO4Mini',
+    'chatgptApiGpt5',
+    'chatgptApiGpt5Mini',
+    'chatgptApiGpt5Nano',
   ],
   customApiModes: [
     {

src/services/apis/openai-api.mjs

@@ -5,7 +5,38 @@ import { fetchSSE } from '../../utils/fetch-sse.mjs'
 import { getConversationPairs } from '../../utils/get-conversation-pairs.mjs'
 import { isEmpty } from 'lodash-es'
 import { getCompletionPromptBase, pushRecord, setAbortController } from './shared.mjs'
-import { getModelValue } from '../../utils/model-name-convert.mjs'
+import { getModelValue, isUsingReasoningModel } from '../../utils/model-name-convert.mjs'
+
+/**
+ * Extract content from structured response arrays for reasoning models
+ * @param {Array} contentArray - Array of content segments
+ * @returns {string} - Extracted text content
+ */
+function extractContentFromArray(contentArray) {
+  if (!Array.isArray(contentArray)) {
+    console.debug('Content is not an array, returning empty string')
+    return ''
+  }
+
+  try {
+    const parts = contentArray
+      .map((part) => {
+        if (typeof part === 'string') return part
+        if (part && typeof part === 'object') {
+          // Prefer output_text segments; fallback to text property
+          if (typeof part.output_text === 'string') return part.output_text
+          if (typeof part.text === 'string') return part.text
+        }
+        return ''
+      })
+      .filter(Boolean)
+
+    return parts.join('')
+  } catch (error) {
+    console.debug('Error extracting content from array:', error)
+    return ''
+  }
+}
 
 /**
  * @param {Browser.Runtime.Port} port
@@ -65,10 +96,16 @@ export async function generateAnswersWithGptCompletionApi(port, question, sessio
         return
       }
 
-      answer += data.choices[0].text
+      const choice = data.choices?.[0]
+      if (!choice) {
+        console.debug('No choice in response data')
+        return
+      }
+
+      answer += choice.text
       port.postMessage({ answer: answer, done: false, session: null })
 
-      if (data.choices[0]?.finish_reason) {
+      if (choice.finish_reason) {
         finish()
         return
       }
@@ -116,37 +153,74 @@ export async function generateAnswersWithChatgptApiCompat(
 ) {
   const { controller, messageListener, disconnectListener } = setAbortController(port)
   const model = getModelValue(session)
+  const isReasoningModel = isUsingReasoningModel(session)
 
   const config = await getUserConfig()
   const prompt = getConversationPairs(
     session.conversationRecords.slice(-config.maxConversationContextLength),
     false,
   )
-  prompt.push({ role: 'user', content: question })
+
+  // Filter messages based on model type
+  const filteredPrompt = isReasoningModel
+    ? prompt.filter((msg) => msg.role === 'user' || msg.role === 'assistant')
+    : prompt
+
+  filteredPrompt.push({ role: 'user', content: question })
 
   let answer = ''
   let finished = false
   const finish = () => {
+    if (finished) return
     finished = true
     pushRecord(session, question, answer)
     console.debug('conversation history', { content: session.conversationRecords })
-    port.postMessage({ answer: null, done: true, session: session })
+    port.postMessage({ answer: null, done: true, session })
+  }
+
+  // Build request body with reasoning model-specific parameters
+  const requestBody = {
+    messages: filteredPrompt,
+    model,
+    ...extraBody,
+  }
+
+  if (isReasoningModel) {
+    // Reasoning models use max_completion_tokens instead of max_tokens
+    requestBody.max_completion_tokens = config.maxResponseTokenLength
+    // Reasoning models don't support streaming during beta
+    requestBody.stream = false
+    // Reasoning models have fixed parameters during beta
+    requestBody.temperature = 1
+    requestBody.top_p = 1
+    requestBody.n = 1
+    requestBody.presence_penalty = 0
+    requestBody.frequency_penalty = 0
+    // Disallow tools/functions/function calling in reasoning mode
+    delete requestBody.tools
+    delete requestBody.tool_choice
+    delete requestBody.functions
+    delete requestBody.function_call
+  } else {
+    // Non-reasoning models use the existing behavior
+    requestBody.stream = true
+    requestBody.max_tokens = config.maxResponseTokenLength
+    requestBody.temperature = config.temperature
   }
+
+  // Validate API key
+  if (!apiKey || typeof apiKey !== 'string' || !apiKey.trim()) {
+    throw new Error('Invalid API key provided')
+  }
+
   await fetchSSE(`${baseUrl}/chat/completions`, {
     method: 'POST',
     signal: controller.signal,
     headers: {
       'Content-Type': 'application/json',
-      Authorization: `Bearer ${apiKey}`,
+      Authorization: `Bearer ${apiKey.trim()}`,
     },
-    body: JSON.stringify({
-      messages: prompt,
-      model,
-      stream: true,
-      max_tokens: config.maxResponseTokenLength,
-      temperature: config.temperature,
-      ...extraBody,
-    }),
+    body: JSON.stringify(requestBody),
     onMessage(message) {
       console.debug('sse message', message)
       if (finished) return
@@ -162,21 +236,57 @@ export async function generateAnswersWithChatgptApiCompat(
         return
       }
 
-      const delta = data.choices[0]?.delta?.content
-      const content = data.choices[0]?.message?.content
-      const text = data.choices[0]?.text
-      if (delta !== undefined) {
-        answer += delta
-      } else if (content) {
-        answer = content
-      } else if (text) {
-        answer += text
-      }
-      port.postMessage({ answer: answer, done: false, session: null })
+      if (isReasoningModel) {
+        // For reasoning models (non-streaming), get the complete response
+        const choice = data.choices?.[0]
+        if (!choice) {
+          console.debug('No choice in response data for reasoning model')
+          return
+        }
 
-      if (data.choices[0]?.finish_reason) {
-        finish()
-        return
+        let content = choice.message?.content ?? choice.text
+
+        // Handle structured response arrays for reasoning models
+        if (Array.isArray(content)) {
+          content = extractContentFromArray(content)
+        }
+
+        // Ensure content is a string and not empty
+        if (content && typeof content === 'string') {
+          const trimmedContent = content.trim()
+          if (trimmedContent) {
+            answer = trimmedContent
+            port.postMessage({ answer, done: false, session: null })
+          }
+        }
+
+        // Only finish when we have a proper finish reason
+        if (choice.finish_reason) {
+          finish()
+        }
+      } else {
+        // For non-reasoning models (streaming), handle delta content
+        const choice = data.choices?.[0]
+        if (!choice) {
+          console.debug('No choice in response data')
+          return
+        }
+        const delta = choice.delta?.content
+        const content = choice.message?.content
+        const text = choice.text
+        if (delta !== undefined) {
+          answer += delta
+        } else if (content) {
+          answer = content
+        } else if (text) {
+          answer += text
+        }
+        port.postMessage({ answer, done: false, session: null })
+
+        if (choice.finish_reason) {
+          finish()
+          return
+        }
       }
     },
     async onStart() {},

src/utils/model-name-convert.mjs

@@ -164,3 +164,24 @@ export function isInApiModeGroup(apiModeGroup, configOrSession) {
   const [, { value: groupValue }] = foundGroup
   return groupValue === apiModeGroup
 }
+
+export function isUsingReasoningModel(configOrSession) {
+  const modelValue = getModelValue(configOrSession)
+  if (!modelValue) return false
+
+  // Match o1, o3, or o4 models with optional standard OpenAI suffixes
+  // Allows: o1, o1-preview, o1-mini, o3, o3-mini, o4, o4-mini, etc.
+  // Prevents: o10, o30, o40, o1x, o3x, o4x, and other invalid patterns
+  if (/^o[134](?:$|-(?:preview|mini|turbo|instruct|nano|small|medium|large))$/.test(modelValue)) {
+    return true
+  }
+
+  // Match gpt-5* pattern but exclude gpt-5-chat-* variants
+  // Allows: gpt-5, gpt-5-mini, gpt-5-nano, gpt-5-preview, gpt-5-turbo
+  // Prevents: gpt-5-chat-latest, gpt-5-chat, etc.
+  if (modelValue.startsWith('gpt-5') && !modelValue.startsWith('gpt-5-chat')) {
+    return true
+  }
+
+  return false
+}