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The Instructions field in OpenAIResponsesResponse was defined as string, but upstream providers may return null or non-string JSON values for this field. This causes json.Unmarshal to fail, resulting in HTTP 500 on /v1/responses endpoint. Other fields in the same struct (Status, ToolChoice, Truncation, etc.) already use json.RawMessage. The request-side DTO (openai_request.go) also defines Instructions as json.RawMessage. This fix aligns the response-side with both patterns. Co-authored-by: 40005415C\Administrator <linbin@envicool.com> Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>