Fix magistral streaming to emit reasoning chunks #16434
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ishaan-jaff
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Nov 11, 2025
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ishaan-jaff
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Title
Fix magistral streaming to emit reasoning chunks
Relevant issues
Fixes #16272
Pre-Submission checklist
I have Added testing in the
tests/litellm/directory, Adding at least 1 test is a hard requirement - see detailsI have added a screenshot of my new test passing locally
pytest output attached in PR description
My PR passes all unit tests on
make test-unitpytest litellm/tests/test_litellm/llms/mistral/test_mistral_chat_transformation.pyMy PR's scope is as isolated as possible, it only solves 1 specific problem
Type
🐛 Bug Fix
Changes
mistral/magistral-medium-2509pricing entry inmodel_prices_and_context_window*.jsonthinking_blocks+reasoning_contentwith signatures inlitellm/llms/mistral/chat/transformation.pytests/test_litellm/llms/mistral/test_mistral_chat_transformation.pyto cover streaming reasoning output