[ERROR] OpenAI 응답 실패: 400 – { “error”: { “message”: “This model’s maximum context length is 8192 tokens. However, you requested 8415 tokens (4415 in the messages, 4000 in the completion). Please reduce the length of the messages or completion.”, “type”: “invalid_request_error”, “param”: “messages”, “code”: “context_length_exceeded” } }