Simon Willison • 2/5/2026

Opus 4.6 and Codex 5.3

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The article discusses the near-simultaneous release of two major AI models: Anthropic's Opus 4.6 and OpenAI's GPT-5.3-Codex. It notes the challenge in highlighting significant leaps over their already-capable predecessors but references a compelling demonstration of Opus 4.6's ability to build a C compiler using parallel AI agents.

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#llm #code generation #Openai
Opus 4.6 and Codex 5.3

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