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Interleaved reasoning_content lost for non-Claude models on Anthropic SDK #14638
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Description
Description
When non-Claude models (e.g. kimi-k2.5) are configured via the Anthropic SDK (@ai-sdk/anthropic) with interleaved reasoning capability, reasoning content from previous assistant turns is silently dropped in subsequent requests.
The root cause is that the Anthropic SDK only knows how to serialize thinking blocks — it has no concept of a top-level reasoning_content field on assistant messages. So when opencode replays prior assistant messages that contain reasoning parts, the SDK discards them and the upstream API never receives the reasoning history.
Steps to reproduce
- Configure a non-Claude model (e.g. kimi-k2.5) using
@ai-sdk/anthropicprovider - Enable thinking/reasoning
- Have a multi-turn conversation where the model produces reasoning content
- Observe that on subsequent turns, the prior reasoning content is missing from the request sent to the API
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github-actions commentedon Feb 22, 2026
This issue might be a duplicate of existing issues. Please check:
reasoning_detailsfield causing 400 errors on subsequent turns)reasoning_contentfrom prior turns accumulates in context for DeepSeek modelsThe root cause described here (Anthropic SDK only serializing
thinkingblocks and droppingreasoning_content) may be a distinct variant, but the underlying problem domain overlaps significantly.zwhe99 commentedon Apr 11, 2026
I’m also running into this issue. Any updates on this?
llc1123 commentedon Apr 11, 2026
Just use
@ai-sdk/openai-compatible.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.