GPT-5.3-Codex-Spark is a lightweight version of the company’s coding model, GPT-5.3-Codex, that is optimized to run on ultra-low latency hardware and can deliver over 1,000 tokens per second.
Claude Opus 4.6 improves on Opus’ coding skills, and it now sustains agent tasks for longer and can run more reliably in larger codebases.
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