github / github/app

Execution failed: CAPIError: 400 Function tools with reasoning_effort are not...

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Description

Execution failed: CAPIError: 400 Function tools with reasoning_effort are not supported for gpt-5.6-sol in /v1/chat/completions. To use function tools, use /v1/responses or set reasoning_effort to 'none'. (Request ID: req_99ff04fbcb194c9a8969462fdcd7a452)

---
| Field | Value |
| --- | --- |
| App version | 1.0.25 |
| OS | Windows 10.0.26200 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Day 1 |

Contributor guide

Open the contributing guide

Research direction

Start by reproducing the failure from the /chat path on Windows with app version 1.0.25, then trace the request involving /v1/chat/completions, function tools, and reasoning_effort. Done means the reported gpt-5.6-sol request no longer fails and uses a supported request configuration.

Written by the indexing model from the issue text.

Assessment

Domain
ai, api, desktop
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
35/100

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