GPT-5.3 Codex: The AI That Helped Debug Its Own Training

OpenAI's GPT-5.3 Codex scored 77.3% on Terminal-Bench 2.0 and 56.8% on SWE-Bench Pro — and it helped debug its own training. With a 400K-token context window and Cerebras Spark hitting 1,000+ tokens/sec, this is the most capable coding AI yet.

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