Every Messages API response includes a stop_reason field that tells you why Claude stopped generating. Check this field to decide whether to use the response as-is, continue the conversation, retry, or fall back to another model.

For the full response schema, see the Messages API reference.

本篇目录

• Quick reference
• The stop\reason field
• Stop reason values
• Best practices for handling stop reasons
• Stop reasons vs. errors
• Streaming considerations
• Common patterns
• Next steps