No Chain of Thought retrieved if Provider lacks support, despite `thinkmode` config

[DevSissi]

Description

If the Claude model offered by my model provider does not support the "thinking" capabilities (Thinking Model), does this mean I will be unable to retrieve the Chain of Thought (CoT) even if I have explicitly configured thinkmode in opencode.json?

It seems that the local configuration cannot override the provider's lack of support, effectively resulting in no CoT output.

Plugins

oh-my-opencode @latest, opencode-antigravity-auth @1.2.7

OpenCode version

1.0.223

Steps to reproduce

No response

Screenshot and/or share link

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Operating System

No response

Terminal

No response

[github-actions]

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

• Claude Sonnet 4.5 is not thinking by default #3284: Claude Sonnet 4.5 is not thinking by default - configuration not being applied
• Sonntet 4.5 thinking boxes are not showing despite thinking boxes enabled. #2919: Sonnet 4.5 thinking boxes are not showing despite thinking boxes enabled
• Support reasoning configuration for AWS Bedrock provider #3428: Support reasoning configuration for AWS Bedrock provider - related to provider capability limitations
• DeepSeek V3.2 : reasoning_content not cleared from message history on new turns, causing excess token usage and violating API spec #5577: DeepSeek V3.2 reasoning_content not cleared from message history - related to reasoning/thinking handling

These issues involve thinking/reasoning configuration not being properly applied or displayed, which may be related to your situation where thinkmode config is ignored when the provider lacks support. Feel free to ignore if none of these address your specific case.

[rekram1-node]

im not sure what u mean whats thinkmode?

[DevSissi]

I am utilizing the Claude models(e.g., Opus 4.5) by kiro(aiclient-2-api). However, it appears that the models in Kiro do not support toggling thinking via the thinking parameter in opencode.json. Is my explanation clear?

[rekram1-node]

what is kiro? How are u hitting it? Is this an issue w/ ur plugin? I dont think we maintain a kiro provider

[DevSissi]

In fact, this is the Claude model provided by Amazon. Is there a more convenient way to check if the current model supports "thinking" and simultaneously display whether thinking mode is enabled?
(Kiro is an AI IDE provided by AWS. I used the AIclient-2-API project to convert it into a local API service and integrated it into OpenCode.)

[rekram1-node]

i mean if it is entirely custom model then opencode doesnt know but all the models we maintain lists of we track:

• reasoning (is it a reasoning model)
• context limits
• tool call capabilities
  and much more

[DevSissi]

By reading Kiro's official documentation, it appears they implement think mode through extensions in their own CLI tool. Does this mean that models from Kiro are inherently models without a think mode?

the doc: https://kiro.dev/docs/cli/experimental/thinking/