OpenAI / Elyse Betters Picaro / ZDNET
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ZDNET's key takeaways
GPT-5.3-Codex helped debug and deploy parts of itself.
Codex can be steered mid-task without losing context.
"Underspecified" prompts now produce richer, more usable results.
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.
Also: OpenAI's Codex just got its own Mac app - and anyone can try it for free now
As with Anthropic's Opus 4.6, OpenAI describes GPT-5.3 as a "frontier model." This is a term the AI industry uses to describe models at the bleeding edge of performance and capability. According to OpenAI, the new 5.3 Codex runs 25% faster, enabling longer-running tasks.
OpenAI's GPT-5.3-Codex is being announced just days after OpenAI's announcement and release of a Mac app dedicated to Codex.
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