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Kimi K2: thinking block does not render <think> tags #4263

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Kimi K2: thinking block does not render <think> tags#4263
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fwang
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zenRelates to Zen

Description

@Arasple
Arasple
opened on Nov 12, 2025

Description

The “thinking” block is not rendered for the Kimi K2 model. The same UI renders a thinking block for Claude Sonnet 4.5.

OpenCode version

1.0.61

Steps to reproduce

  1. Select model: Kimi K2 Thinking Alpha
  2. Submit a prompt that produces a chain-of-thought/thinking stream.
  3. Observe the response pane.

Screenshot and/or share link

Expected Behavior
A “Thinking” block renders (as it does with Claude Sonnet 4.5).

Image

Actual Behavior

Image

Operating System

macOS 26.1

Terminal

Ghostty

Activity

  1. Arasple
    added
    bugSomething isn't working
    on Nov 12, 2025
  2. github-actions
    added
    opentuiThis relates to changes in v1.0, now that opencode uses opentui
    on Nov 12, 2025

  3. github-actions commented on Nov 12, 2025

    @github-actions
    github-actionsBot
    on Nov 12, 2025 – with GitHub Actions
    Contributor

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

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

  4. rekram1-node
    added
    zenRelates to Zen
    and removed
    bugSomething isn't working
    opentuiThis relates to changes in v1.0, now that opencode uses opentui
    on Nov 12, 2025
  5. rekram1-node
    assigned
    fwang
    on Nov 12, 2025
  6. Arasple
    closed this as completedon Dec 3, 2025
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