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Using any cerebras model with api key causes unsupported property errors #4092

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opened 2026-02-16 17:42:34 -05:00 by yindo · 3 comments
yindo commented 2026-02-16 17:42:34 -05:00
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Originally created by @sra on GitHub (Jan 2, 2026).

Originally assigned to: @rekram1-node on GitHub.

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

  1. Authorize cerebras via /connect and api key
  2. Select any cerebras model
  3. type in a prompt
  4. (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

Originally created by @sra on GitHub (Jan 2, 2026). Originally assigned to: @rekram1-node on GitHub. ### 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 1. Authorize cerebras via /connect and api key 2. Select any cerebras model 3. type in a prompt 4. (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
yindo added the bug label 2026-02-16 17:42:34 -05:00
yindo closed this issue 2026-02-16 17:42:34 -05:00
yindo commented 2026-02-16 17:42:34 -05:00
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@github-actions[bot] commented on GitHub (Jan 2, 2026):

This issue might be a duplicate of or related to existing Cerebras provider issues. Please check:

  • #1481: Cerebras API Bad Request errors with max_tokens
  • #4086: Could not set base URL for Cerebras provider
  • #976: Docs for OpenAI Compatible providers like Cerebras

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.

@github-actions[bot] commented on GitHub (Jan 2, 2026): This issue might be a duplicate of or related to existing Cerebras provider issues. Please check: - #1481: Cerebras API Bad Request errors with max_tokens - #4086: Could not set base URL for Cerebras provider - #976: Docs for OpenAI Compatible providers like Cerebras 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.
yindo commented 2026-02-16 17:42:34 -05:00
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@sra commented on GitHub (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 commented on GitHub (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
yindo commented 2026-02-16 17:42:35 -05:00
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@sra commented on GitHub (Jan 4, 2026):

As of v1.1.1 this is resolved.

@sra commented on GitHub (Jan 4, 2026): As of v1.1.1 this is resolved.
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Reference: anomalyco/opencode#4092
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