"OpenAI today announced the launch of GPT-5.3-Codex, which OpenAI claims is the most capable agentic coding model yet released. Interestingly enough, Anthropic, maker of Claude Code, is also releasing a new powerful model at exactly the same time. Anthropic's model, Opus 4.6, is a more general-purpose model, but Anthropic is well known for its Claude Code offering. As with Anthropic's Opus 4.6, OpenAI describes GPT-5.3 as a 'frontier model.'"
"GPT-5.3-Codex is OpenAI's 'first model that was instrumental in creating itself.' The Codex team used Codex to debug its own training, manage its own deployment, and diagnose test results. Also: I got 4 years of product development done in 4 days for $200, and I'm still stunned OpenAI's blog post says, 'With GPT-5.3-Codex, Codex goes from an agent that can write and review code to an agent that can do nearly anything developers and professionals can do on a computer.'"
GPT-5.3-Codex is a new agentic coding model that runs about 25% faster and supports longer-running tasks. Anthropic released Opus 4.6, a general-purpose model, at the same time. Codex was used to debug its own training, manage deployment, and diagnose test results. Codex can be steered mid-task without losing context, and underspecified prompts now yield richer, more usable results. A dedicated Codex Mac app is available, and the release number suggests a general GPT-5.3 may follow soon. The model expands from writing and reviewing code to broad developer and professional computer tasks.
Read at ZDNET
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