The One Parameter That Broke Every GPT-5 Call

You upgrade your model to GPT-5.2. Every single request returns a 400 error. Your agent retries, hits the fallback chain, and eventually times out. The logs show: { "error": { "message": "Unsupported parameter: 'max_tokens' is not supported with this model. Use 'max_completion_tokens' instead.", "type": "invalid_request_error" } } One renamed parameter. 100% failure rate. OpenClaw #62130 tells the story. What Happened OpenAI's GPT-5.x family dropped support for the max_tokens parameter. The repl