OpenAI has announced the release of GPT-5.5, the latest upgrade to the company’s family of models powering its ChatGPT and Codex apps.
OpenAI describes GPT-5.5 as better at multi-step work, claiming it can plan, use tools, and verify its own output with less hand-holding. The model is said to offer gains in agentic coding, computer use, and early-stage scientific research.
GPT-5.5 Thinking offers “faster help for harder problems,” according to OpenAI, while GPT-5.5 Pro is being pitched as a research partner for tougher questions where accuracy matters more than speed.
OpenAI argues that its latest model is more token-efficient, so Codex tasks should – in theory – finish with less overhead despite the bump.
ChatGPT Plus, Pro, Business, and Enterprise subscribers get GPT-5.5 Thinking, while the more powerful GPT-5.5 Pro model is limited to ChatGPT Pro, Business, and Enterprise. In Codex, GPT-5.5 spans Plus, Pro, Business, Enterprise, Edu, and Go plans. API access is said to be coming “very soon.”