OpenAI upgrades Codex with a new version of GPT-5

OpenAI announced Monday that it’s releasing a new version of GPT-5 to its AI coding agent, Codex. The company says its new model, called GPT-5-Codex, spends its “thinking” time more dynamically than previous models and could spend anywhere from a few seconds to seven hours on a coding task. As a result, it performs better on agentic coding benchmarks.