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2h ago

OpenAI Releases GPT-5.3-Codex, a Faster Coding Model That Helped Build Itself

The agentic system extends beyond code to long‑running software workflows under tightened cybersecurity safeguards.

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Credit: The New Stack.
SUN VALLEY, IDAHO - JULY 08: CEO of OpenAI Sam Altman arrives at the Sun Valley lodge for the Allen & Company Sun Valley Conference on July 8, 2025 in Sun Valley, Idaho. Every year, some of the world's wealthiest and most powerful figures from the media, finance, technology, and political spheres converge at the Sun Valley Resort for the exclusive week-long conference hosted by boutique investment bank Allen & Co.
Altman said the model powering Codex represents a bigger leap than performance benchmarks may suggest.

Overview

  • OpenAI says GPT-5.3-Codex runs 25% faster than GPT-5.2-Codex while using fewer computing resources.
  • The company reports early Codex versions debugged training, managed deployment, and diagnosed test results during the model’s development.
  • OpenAI classifies the model as “high-capability” for cybersecurity tasks and is introducing expanded safeguards, a Trusted Access for Cyber pilot, and $10 million in API credit grants for researchers.
  • OpenAI cites new industry highs on SWE-Bench Pro and Terminal Bench with strong results on OSWorld and GDPVal.
  • GPT-5.3-Codex is available in paid ChatGPT Codex tools across app, CLI, IDE extension, and web, with API access planned and a new Mac desktop app surpassing 500,000 downloads.