Any request to gpt 5.

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 |

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.

索引モデルが issue の本文から書いたものです。