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Assistant messages missing thinking block in conversation history when extended thinking is enabled #20427
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Description
Description
When using an Anthropic-compatible API provider with extended thinking enabled, opencode does not include the thinking content block in assistant messages when replaying conversation history. This may cause downstream errors like:
{
"error": {
"type":"invalid_request_error",
"message": "thinking is enabled but reasoning_content is missing in assistant tool call message at index 1"
}
}
Plugins
No response
OpenCode version
1.3.3
Steps to reproduce
- Configure opencode to use an Anthropic-compatible provider (e.g. Moonshot API: https://api.moonshot.cn/anthropic/v1/messages)
- Select kimi-k2.5 under ZenMux as the provider
- Enable extended thinking with budget_tokens
- Trigger a multi-turn conversation that involves tool use (e.g. type "Please search for news about opencode"), which causes the model to invoke a tool call followed by a tool result
- The second API request fails with the error above
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Operating System
macOs Sonoma 14.8.3
Terminal
No response
Reacted by Felipe Linares
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github-actions commentedon Apr 1, 2026
This issue might be a duplicate of existing issues. Please check:
"thinking is enabled but reasoning_content is missing in assistant tool call message"If your issue is the same, please consider adding a comment there instead or linking these issues together.
github-actions commentedon Jul 4, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.