feat: compatible gpt thinking to nil

[feitianbubu]

gpt5不再支持thinking, 兼容一下客户端误传报错的问题

Summary by CodeRabbit

• Bug Fixes
  • Improved compatibility with newer GPT model versions by ensuring unsupported parameters are properly disabled during request processing.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ba437f60-9c82-451e-8785-f5e41d8056f9

📥 Commits

Reviewing files that changed from the base of the PR and between 9ae9040 and b2003d5.

📒 Files selected for processing (1)

• relay/channel/openai/adaptor.go

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Walkthrough

The OpenAI adaptor is modified to clear the request.THINKING field when processing upstream models with names starting with "gpt-5", disabling this unsupported parameter alongside existing temperature, top-p, and logprobs adjustments.

Changes

Cohort / File(s)	Summary
Request Parameter Handling relay/channel/openai/adaptor.go	Clears request.THINKING field for upstream models starting with "gpt-5" to disable unsupported parameters.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• Fix reasoning adaptor for openrouter #1577: Modifies the same file to clear request.THINKING for "anthropic" model variants, demonstrating a consistent pattern of field clearing for model-specific branches.

Poem

🐰 When gpt-5 comes to play,
Thinking gets whisked away,
Parameters trimmed with care,
One line fix, swift and fair! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat: compatible gpt thinking to nil' directly relates to the main change of clearing the THINKING field for gpt-5 models to ensure compatibility.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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