OpenAI launches GPT-5.5 on ChatGPT and Codex

OpenAI launched GPT-5.5 for ChatGPT and Codex, positioning it as a more autonomous model for coding, research, and office work.

The company says GPT-5.5 improves task completion and agentic workflows, with stronger performance on software, analysis, and long-context use cases.

It is rolling out to paid ChatGPT and Codex tiers, with different context windows and fast-mode options for various plans.

OpenAI also highlighted benchmark gains and said API access is coming soon, intensifying competition with Claude and Gemini.