I have searched all existing open AND closed issues and discussions for similar requests. I have found none that is comparable to my request.
Problem Description
Using OpenWebUI v0.6.34 with OpenAI API key, some models like GPT-5 work but others like GPT-5-PRO fail with this message:
This model is only supported in v1/responses and not in v1/chat/completions.
Desired Solution you'd like
It would be cool for OpenWebUI to be compatible with models like GPT-5-PRO and/or future models.
Alternatives Considered
n/a
Additional Context
No response
Originally created by @i-rme on GitHub (Oct 24, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/18575
### Check Existing Issues
- [x] I have searched all existing open AND closed issues and discussions for similar requests. I have found none that is comparable to my request.
### Problem Description
Using OpenWebUI v0.6.34 with OpenAI API key, some models like GPT-5 work but others like GPT-5-PRO fail with this message:
`This model is only supported in v1/responses and not in v1/chat/completions.`
### Desired Solution you'd like
It would be cool for OpenWebUI to be compatible with models like GPT-5-PRO and/or future models.
### Alternatives Considered
n/a
### Additional Context
_No response_
I'm afraid Open WebUI does not support the responses API (and as far as I know there's no intent in supporting it). You can bypass this issue by using OpenRouter
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@sebslight commented on GitHub (Oct 24, 2025):
I'm afraid Open WebUI does not support the responses API (and as far as I know there's no intent in supporting it). You can bypass this issue by using OpenRouter
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Originally created by @i-rme on GitHub (Oct 24, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/18575
Check Existing Issues
Problem Description
Using OpenWebUI v0.6.34 with OpenAI API key, some models like GPT-5 work but others like GPT-5-PRO fail with this message:
This model is only supported in v1/responses and not in v1/chat/completions.Desired Solution you'd like
It would be cool for OpenWebUI to be compatible with models like GPT-5-PRO and/or future models.
Alternatives Considered
n/a
Additional Context
No response
@sebslight commented on GitHub (Oct 24, 2025):
I'm afraid Open WebUI does not support the responses API (and as far as I know there's no intent in supporting it). You can bypass this issue by using OpenRouter