openai-gpt-56-luna via Venice.ai fails due to thinking level

I have Venice.ai configured as the model provider. I am trying to use openai-gpt-56-luna, which worked fine in the past. Now I get the following error.

Ran into this error: Request failed: Bad request (400): {"error":"Function tools with reasoning_effort are not supported for gpt-5.6-luna in /v1/chat/completions. To use function tools, use /v1/responses or set reasoning_effort to 'none'.","request_id":"r3mgV1AKXDuERfp_Gxj7V"}.

I am unable to use the /v1/responses option (instead of /v1/chat/completions), and I am unable to set the thinking/reasoning effort to none.

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**To Reproduce**
Steps to reproduce the behavior:
1. Set up Venice.ai as the model provider with a Venice API key
2. Select openai-gpt-56-luna as the model
3. Try any prompt
4. See error above

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**Expected behavior**
This model provider and model should work, and has worked fine in the past.

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**Please provide the following information**
- **OS & Arch:** macos 25.6.0 aarch64
- **Interface:** UI
- **Version:** 1.48.0
- **Extensions enabled:** todo, tom, developer, skills, analyze, summon, Extension Manager, Playwright, scheduler
- **Provider & Model:** venice - openai-gpt-56-luna

[diagnostics_20260902_22.json](https://github.com/user-attachments/files/31748860/diagnostics_20260902_22.json)