Model Claude Sonnet 4.5 Error: temperature and top_p cannot both be specified for this model. Please use only one.

[GentleSource]

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Bug

Copilot Feature Area

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Using Copilot as Eclipse Plugin.

Sorry, an error occurred while generating a response. Details: unhandled status from server: 400

{"error":{"code":"invalid_request_error","message":"temperature and top_p cannot both be specified for this model. Please use only one.","type":"invalid_request_error","param":null}}

Request ID: f9cb1b83-c24d-4fbb-9d0a-e257053b28bc

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[novello-dev]

lol. this isn’t actually a copilot bug. the error comes from the model itself: claude sonnet 4.5 doesn’t allow both temperature and top_p to be set at the same time. if the eclipse plugin sends both, the api returns that 400.

the fix is basically choosing one of them. if the plugin lets you adjust the settings, set either temperature or top_p to null/disabled. if you can’t change it manually, it’s probably an issue in the plugin’s config and the maintainers need to update it so it only sends one parameter for this model.

hope this helps. if it solves your issue, feel free to mark the thread as answered so others can find it later.

[GentleSource]

this isn’t actually a copilot bug

It's a bug in the Copilot Eclipse Plugin but there was no option to select that. It worked fine until the last update and I found no way to change the configuration of that model.

Is there another way to report this bug?

[novello-dev]

Yeah, that makes sense, if the plugin doesn’t let you change the model settings, then it’s definitely something the Eclipse extension needs to fix.

The best way to report it is through the Copilot Eclipse plugin’s issue tracker on GitHub. That’s where the maintainers handle config/parameter bugs like this one.

And if my previous reply cleared things up, feel free to mark the thread as answered so it doesn’t get buried. 👍