perf: request low reasoning effort for OpenAI agents

src/ai/ai-provider.service.spec.ts

@@ -39,6 +39,31 @@ describe('AiProviderService', () => {
     expect(fetchMock).not.toHaveBeenCalled();
   });
 
+  it.each([
+    'gpt-6.1-sol', 'gpt-6-astra', 'gpt-6-sol', 'gpt-6-luna', 'gpt-6.1-sol-2026-10-06',
+    'gpt-5', 'gpt-5-mini', 'gpt-5.1', 'gpt-5.5', 'gpt-5.6-sol', 'o1', 'o3', 'o4-mini',
+  ])('requests low reasoning effort for OpenAI model %s', async model => {
+    const fetchMock = jest.fn().mockResolvedValue({ ok: true, json: async () => ({ choices: [{ message: { content: '{"ok":true}' } }] }) });
+    global.fetch = fetchMock as typeof fetch;
+    const service = new AiProviderService({ get: jest.fn() } as unknown as ConfigService);
+    await service.complete({ provider: 'OPENAI', model, apiKey: 'fixture', system: 'Return JSON', json: true, messages: [{ role: 'user', content: 'Find the steering configuration' }] });
+    const body = JSON.parse(String(fetchMock.mock.calls[0][1].body));
+    expect(body).toMatchObject({ model, reasoning_effort: 'low', response_format: { type: 'json_object' } });
+    expect(body).not.toHaveProperty('temperature');
+    expect(body.messages).toEqual([{ role: 'system', content: 'Return JSON' }, { role: 'user', content: 'Find the steering configuration' }]);
+  });
+
+  it.each([
+    'gpt-4.1-mini', 'gpt-4o', 'custom-model', 'gpt-5-pro', 'gpt-5.2-pro-2025-12-11',
+    'gpt-5-chat-latest', 'gpt-5.1-chat-latest', 'o1-mini', 'o1-preview-2024-09-12', 'o3-deep-research',
+  ])('preserves default reasoning settings for unsupported OpenAI variant %s', async model => {
+    const fetchMock = jest.fn().mockResolvedValue({ ok: true, json: async () => ({ choices: [{ message: { content: 'answer' } }] }) });
+    global.fetch = fetchMock as typeof fetch;
+    const service = new AiProviderService({ get: jest.fn() } as unknown as ConfigService);
+    await service.complete({ provider: 'OPENAI', model, apiKey: 'fixture', system: 'system', messages: [{ role: 'user', content: 'test' }] });
+    expect(JSON.parse(String(fetchMock.mock.calls[0][1].body))).not.toHaveProperty('reasoning_effort');
+  });
+
   it('prefers the course Qwen endpoint over the server default', async () => {
     const fetchMock = jest.fn().mockResolvedValue({
       ok: true,
@@ -89,6 +114,7 @@ describe('AiProviderService', () => {
     const body = JSON.parse(String(fetchMock.mock.calls[0][1].body));
     expect(provider === 'GEMINI' ? body.generationConfig : body).not.toHaveProperty('temperature');
     expect(body).not.toHaveProperty('enable_thinking');
+    if (provider !== 'OPENAI') expect(body).not.toHaveProperty('reasoning_effort');
     if (provider !== 'GEMINI') expect(body.model).toBe(model);
     if (provider === 'OPENAI') expect(body.response_format).toEqual({ type: 'json_object' });
     if (provider === 'GEMINI') expect(body.generationConfig.responseMimeType).toBe('application/json');
@@ -108,6 +134,7 @@ describe('AiProviderService', () => {
     await service.complete({ provider, model, apiKey: 'fixture', system: 'system', messages: [{ role: 'user', content: 'test' }] });
     const body = JSON.parse(String(fetchMock.mock.calls[0][1].body));
     expect(provider === 'GEMINI' ? body.generationConfig.temperature : body.temperature).toBe(0.2);
+    expect(body).not.toHaveProperty('reasoning_effort');
     if (provider !== 'QWEN') expect(body).not.toHaveProperty('enable_thinking');
     if (provider !== 'GEMINI') expect(body.model).toBe(model);
   });

src/ai/ai-provider.service.ts

@@ -54,12 +54,14 @@ export class AiProviderService {
 
   private async openAi(input: CompletionInput): Promise<AiCompletionResult> {
     const reasoningModel = /^gpt-(?:5|6)(?:[.-]|$)|^o[1-9](?:-|$)/.test(input.model);
+    const lowReasoningModel = reasoningModel && !/-(?:pro|chat|deep-research)(?:-|$)|^o1-(?:mini|preview)(?:-|$)/.test(input.model);
     const response = await fetch('https://api.openai.com/v1/chat/completions', {
       method: 'POST',
       headers: { Authorization: `Bearer ${input.apiKey}`, 'Content-Type': 'application/json' },
       body: JSON.stringify({
         model: input.model,
         temperature: reasoningModel ? undefined : 0.2,
+        reasoning_effort: lowReasoningModel ? 'low' : undefined,
         response_format: input.json ? { type: 'json_object' } : undefined,
         messages: [{ role: 'system', content: input.system }, ...input.messages],
       }),

src/ai/copilot-backend.spec.ts

@@ -48,7 +48,7 @@ describe('managed A-Copilot backend', () => {
     await provider.complete({ provider: 'A_COPILOT', model: 'ignored', apiKey: 'ignored', endpointUrl: 'https://untrusted.test', system: 'agent instructions', json: true, messages: [{ role: 'user', content: 'test' }] });
     expect(fetchMock.mock.calls[0][0]).toBe('https://api.openai.com/v1/chat/completions');
     expect(fetchMock.mock.calls[0][1].headers.Authorization).toBe('Bearer shared-openai-key');
-    expect(JSON.parse(fetchMock.mock.calls[0][1].body)).toMatchObject({ model: 'gpt-6-astra', response_format: { type: 'json_object' }, messages: [{ role: 'system', content: 'agent instructions' }, { role: 'user', content: 'test' }] });
+    expect(JSON.parse(fetchMock.mock.calls[0][1].body)).toMatchObject({ model: 'gpt-6-astra', reasoning_effort: 'low', response_format: { type: 'json_object' }, messages: [{ role: 'system', content: 'agent instructions' }, { role: 'user', content: 'test' }] });
   });
 
   it('never falls back to a different server provider when its configured key is missing', async () => {