GPT-5 no longer supports the temperature parameter

[snipeship]

App Version

3.25.11

API Provider

OpenAI

Model Used

GPT-5

Roo Code Task Links (Optional)

No response

🔁 Steps to Reproduce

1. Latest Roo version (insiders) - v3.25.11
2. Set GPT-5 to use the a custom base URL being LiteLLM

3. "litellm.UnsupportedParamsError: The following parameters are not supported for model gpt-5: temperature"

💥 Outcome Summary

Expected request to succeed, but got a panic from LiteLLM saying that "temperature" is no longer supported (it officially isn't supported anymore in the API)

📄 Relevant Logs or Errors (Optional)

[roomote]

I'm here to help out the maintainers and am going to see if I can fix the issue! Looking into the GPT-5 temperature parameter compatibility issue with LiteLLM now.

[roomote]

I've created a pull request to fix this issue: #6966

The fix removes the temperature parameter from GPT-5 API requests since it's no longer supported. The changes include:

• Removed temperature from GPT-5 Responses API requests
• Updated model parameter handling to exclude temperature for GPT-5 models
• Updated tests to reflect this change

All tests are passing locally and CI checks are currently running on the PR.

[hannesrudolph]

GPT-5 does not support tempterature.