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Using any cerebras model with api key causes unsupported property errors #6648
Description
Description
Using a Cerebras provider connected via /connect or opencode auth login the model list is properly retrieved and you can select one, but when using any model I get:
body.maxTokens: property 'body.maxTokens' is unsupported
body.thinking: property 'body.thinking' is unsupported
Errors back
OpenCode version
1.0.223
Steps to reproduce
- Authorize cerebras via /connect and api key
- Select any cerebras model
- type in a prompt
- (or) opencode run --model cerebras/gpt-oss-120b "test"
Error: body.maxTokens: property 'body.maxTokens' is unsupported
body.thinking: property 'body.thinking' is unsupported
Screenshot and/or share link
https://opncd.ai/share/W5OP1lFi
Operating System
Darwin Mac 25.2.0
Terminal
Warp
Activity
github-actions commentedon Jan 2, 2026
This issue might be a duplicate of or related to existing Cerebras provider issues. Please check:
The errors you're experiencing (unsupported properties for maxTokens and thinking) suggest there may be compatibility issues between the Vercel AI SDK and the Cerebras API request format. These related issues might provide context or workarounds.
sra commentedon Jan 2, 2026
I checked this on dev branch and it doesn't happen so something between v1.0.223 and dev looks to have fixed it. I'll verify in v1.0.224 and close this
sra commentedon Jan 4, 2026
As of v1.1.1 this is resolved.
misterdojo777 commentedon Mar 2, 2026
still an issue on version 1.2.15.