OpenAI Launches GPT-5-Codex: Smarter, Flexible AI for Coding

OpenAI has unveiled a major upgrade to its coding assistant with the release of GPT-5-Codex, a new version of Codex built on GPT-5. The model introduces a unique ability to decide how much time it should spend on solving coding problems—ranging from just seconds to as long as seven hours. This dynamic approach has already helped it score higher in coding benchmarks compared to earlier models.

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OpenAI Launches GPT-5-Codex

The rollout is underway for ChatGPT Plus, Pro, Business, Edu, and Enterprise users, with access also available through GitHub, IDEs, and the terminal. OpenAI says API support will follow soon.

The launch comes as AI coding tools gain strong global momentum. Rivals like Claude Code, Cursor, and Windsurf have rapidly grown, while GitHub Copilot remains the market leader. Cursor recently surpassed $500 million in annual recurring revenue, and Windsurf was partly acquired by Google and Cognition after a fierce bidding war. Against this backdrop, GPT-5-Codex is seen as OpenAI’s push to keep Codex highly competitive.

Beyond writing new code, GPT-5-Codex excels at reviewing and refactoring existing projects. It outperforms GPT-5 on SWE-bench Verified, a key benchmark for coding agents, and provides more precise, actionable feedback. OpenAI credits input from professional engineers during training for reducing wrong suggestions and making reviews more practical.

Alexander Embiricos, Codex product lead, highlighted the model’s dynamic problem-solving ability as its biggest breakthrough. “Unlike other systems that fix how much time or compute to spend upfront, GPT-5-Codex can adapt as it works. In some cases, it has extended problem-solving up to seven hours,” he said.

For developers, the tool promises more reliable coding support and peer-like code reviews. Still, its growing sophistication raises ongoing questions about the future role of human programmers. OpenAI maintains that GPT-5-Codex is designed to assist, not replace, developers—though its capabilities may blur that line in the future.

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