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fix(openai): normalize Pydantic objects before JSON serialization in truncate_messages_by_size #5351

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fix(openai): normalize Pydantic objects before JSON serialization in truncate_messages_by_size #5351

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4 changes: 4 additions & 0 deletions sentry_sdk/ai/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -660,6 +660,10 @@ def truncate_messages_by_size(
In the single message case, the serialized message size may exceed `max_bytes`, because
truncation is based only on character count in that case.
"""
# Normalize messages to ensure JSON serialization works
# (handles Pydantic objects from OpenAI SDK v1+)
messages = _normalize_data(messages, unpack=False)

serialized_json = json.dumps(messages, separators=(",", ":"))
current_size = len(serialized_json.encode("utf-8"))

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