github / github/app

Any request to gpt 5.

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Description

Any request to gpt 5.6 terra fails with "Execution failed: Error: Reasoning effort 'high' is not supported for model 'claude-haiku-4.5'.". And then model selector become disabled with lable gpt-5.6-terra (not available)

---
| Field | Value |
| --- | --- |
| App version | 1.1.14 |
| OS | macOS 26.5.2 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Day 1 |

Contributor guide

Open the contributing guide

Research direction

Start by reproducing the failure on the /chat path with app version 1.1.14 and the gpt-5.6-terra model, then inspect how model selection and request execution handle the reported reasoning-effort error. Done means requests no longer fail for this model and the model selector does not become disabled or show it as unavailable.

Written by the indexing model from the issue text.

Assessment

Tech stack
macos
Domain
desktop
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Active
Clarity
Mostly clear
Newbie friendliness
45/100

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