OpenAI 404/400 errors

[alanmead]

Describe the bug

Out of the box, Goose doesn't work with OpenAI models. Trying to follow "goose in 5 minutes" using OpenAI. All models I've tried (babbage, gpt-4o, codex, o3, gpt-5, gpt-5.1, etc; see below) report 404 or 400 errors.

EDIT: Some details were reported wrong because I didn't realize that model choice was sticky in a session. I've corrected them.

codex:

Ran into this error: Request failed: Resource not found (404): This model is only supported in v1/responses and not in v1/chat/completions..

gpt-4o, babbage:

Ran into this error: Request failed: Resource not found (404): tools is not supported in this model. For a list of supported models, refer to https://platform.openai.com/docs/guides/function-calling#models-supporting-function-calling..

I edited the OpenAI configuration and changed the endpoint to v1/responses and this enabled a new set of models. I tried several (gpt-4o-mini, o3, gpt-5). This endpoint requires a different JSON payload that is not produced by Goose:

Ran into this error: Request failed: Bad request (400): Unsupported parameter: 'messages'. In the Responses API, this parameter has moved to 'input'. Try again with the new parameter. See the API documentation for more information: https://platform.openai.com/docs/api-reference/responses/create..

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To Reproduce
Steps to reproduce the behavior:

1. Generate a new OpenAI API key
2. Configure provider (accept defaults), use default model (gpt-4o)
3. Enter any prompt, like: create an interactive browser-based tic-tac-toe game in javascript where a player competes against a bot
4. See error
5. Configure provider, change endpoint to 'v1/responses', use default model (gpt-4o)
6. Enter any prompt, like: create an interactive browser-based tic-tac-toe game in javascript where a player competes against a bot
7. See error
8. Switch models (either from list of custom)
9. Enter any prompt, like: create an interactive browser-based tic-tac-toe game in javascript where a player competes against a bot
10. See error

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Expected behavior
It seems like Goose should work with OpenAI models.

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Please provide the following information

• OS & Arch: Fedora 43 x86
• Interface: UI
• Version: v1.16.1
• Extensions enabled: Default (Chatrecall, Developer, Extension Manager, Skills, Todo)
• Provider & Model: See above (multiple OpenAI on two endpoints)

[DOsinga]

we don't support the responses API yet, so don't change the url there. /cc @katzdave

[DOsinga]

we're working on it though

[michaelneale]

should be ok now - with the chatgpt/codex provider as well? please open if not