Azure models fail due to reasoning_effort being sent even with --variant none

[bkocis]

When using OpenCode with Azure OpenAI models, OpenCode appears to always include the reasoning_effort request argument, even when reasoning is explicitly disabled via --variant none.

Azure rejects this parameter for certain deployments with a hard error:

Error: Unrecognized request argument supplied: reasoning_effort

This makes it impossible to use some Azure models with OpenCode at the moment.

When I use gpt-4 based models this issue does not appear!

Environment

OpenCode version: 1.1.20
OS: Mac 26.2 (25C56)
Provider: azure-apim
Model: gpt-5
Azure OpenAI via APIM
Azure region: EU

Steps to reproduce

opencode run
-m "azure-apim/gpt-5"
--variant none
"Hello"

Returns:

Error: Unrecognized request argument supplied: reasoning_effort

Expected Behavior

When using --variant none, OpenCode should omit the reasoning_effort parameter entirely from the request.

Azure requires unsupported parameters to be omitted, not set to "none".

Also, how to indeed use the reasoning models gpt-5 on Azure with Opencode?

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• Reasoning effort from opencode.json not passed through for Azure models #1823: Reasoning effort from opencode.json not passed through for Azure models - related Azure reasoning_effort configuration issue
• using groq DeepseekR1DistillLlama70b failes with: reasoning_effort is unsupported #53: using groq DeepseekR1DistillLlama70b failes with: reasoning_effort is unsupported - similar reasoning_effort parameter rejection
• Azure OpenAI need to change completions -> responses #7180: Azure OpenAI need to change completions -> responses - other Azure API compatibility issues

Feel free to ignore if none of these address your specific case.

[JosXa]

Same for reasoningSummary, see #13546

[rekram1-node]

Are you going through litellm?

[bkocis]

Are you going through litellm?

no

[github-actions]

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