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OpenAI-compatible parser drops streamed delta.reasoning (v2) #37553
Description
Description
Description
Some OpenAI-compatible providers, including vLLM, stream reasoning through choices[].delta.reasoning rather than delta.reasoning_content.
OpenCode v2 ignores these deltas, so no reasoning part is stored or displayed. The final response text still appears.
OpenCode version
0.0.0-next-15766
Steps to reproduce
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Configure an OpenAI-compatible provider that emits:
{"choices":[{"delta":{"reasoning":"Thinking text"}}]} -
Run a reasoning model with --thinking.
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Observe that only the final text is displayed and reasoning is recorded as zero.
Expected: both delta.reasoning_content and delta.reasoning produce reasoning events.
Actual: only delta.reasoning_content is parsed.
Plugins
No response
OpenCode version
No response
Steps to reproduce
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Screenshot and/or share link
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Operating System
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Terminal
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Activity
github-actions commentedon Jul 17, 2026
This issue might be a duplicate of existing issues. Please check:
reasoningfield is dropped #35283: OpenAI-compatible reasoning streamed underreasoningfield is dropped — same symptom ofdelta.reasoningbeing ignored for OpenAI-compatible providersbbartels commentedon Jul 17, 2026
Duplicate of #35283