Support reasoning for OpenRouter using OpenAI provider

[xsun2001]

💻 变更类型 | Change Type

• feat
• fix
• refactor
• perf
• style
• test
• docs
• ci
• chore
• build

🔀 变更说明 | Description of Change

• Add include_reasoning = true in chat request payload for openrouter
• Using delta.reasoning instead of delta.reasoning_content for openrouter
• Optimize reasoning display style to include all reasoning text in one single quote block

📝 补充信息 | Additional Information

Summary by CodeRabbit

• New Features

  • Chat interactions now include enriched contextual details in responses when using "openrouter.ai", enhancing user insights.

• Style

  • Improved live message formatting ensures a clearer and more consistent display during active processing, resulting in a smoother and more engaging user experience.

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[coderabbitai]

Walkthrough

The changes modify three key files. In app/client/platforms/openai.ts, imports have been reorganized to include new constants and modules, and the chat method in the ChatGPTApi class now conditionally adds a reasoning flag based on the request path. The app/utils/chat.ts file sees the repositioning of the UPLOAD_URL constant and updates to the streaming functions for consistent newline formatting during thinking mode. In app/api/common.ts, a new mechanism for modifying the request payload based on the baseUrl is introduced, enhancing request handling.

Changes

File(s)	Change Summary
app/client/platforms/openai.ts	Reorganized imports (added Azure and repositioned OPENAI_BASE_URL); updated chat method to check if chatPath contains "openrouter.ai" and include include_reasoning accordingly; refined extraction and handling of reasoning in response; adjusted streamWithThink callback for new choices structure.
app/utils/chat.ts	Moved UPLOAD_URL constant; updated stream and streamWithThink functions to consistently prefix newlines with "> " during thinking mode and simplified content formatting.
app/api/common.ts	Introduced a mechanism to modify request payloads based on the baseUrl containing "openrouter.ai"; streamlined request body parsing.

Possibly related PRs

• 1 #6289: The changes in the main PR are related to those in the retrieved PR as both involve modifications to the app/api/common.ts file, specifically regarding the handling of request payloads and the addition of properties based on certain conditions.

Poem

I'm a little rabbit, hopping through the code,
Rearranging imports on a winding road.
Chat paths checked with a keen, alert eye,
Reasoning flags set as messages fly.
With every line and every thoughtful tweak,
We dance in the rhythm—our code unique!
🥕🐇

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 6e082ad and a87ec75.

📒 Files selected for processing (2)

• app/api/common.ts (3 hunks)
• app/client/platforms/openai.ts (8 hunks)

🔇 Additional comments (5)

app/api/common.ts (3)

93-100: Efficient enhancement for OpenRouter reasoning capabilities

This addition to modify the request payload for OpenRouter is well implemented. It correctly adds the include_reasoning parameter to enable reasoning functionality specifically for OpenRouter requests.

---

111-111: Using the modified payload in fetchOptions

This change correctly uses the newly processed payload in the fetch request.

---

122-122: Consistent use of modified payload for model validation

Good consistency in using the same modified payload for model validation.

app/client/platforms/openai.ts (2)

298-303: Well-documented client-side implementation for OpenRouter reasoning

The implementation to add include_reasoning: true for OpenRouter on the client side is clean and properly documented. The comment explains the purpose and links to the relevant documentation, which is excellent practice.

---

346-349: Robust handling of different reasoning response formats

This change elegantly handles both the old (reasoning_content) and new (reasoning) response formats, ensuring backward compatibility while supporting the updated structure from OpenRouter.

✨ Finishing Touches

• 📝 Generate Docstrings (Beta)

---

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[xsun2001]

Hi, is there anyone to review this pr?