OpenAI Debuts GPT-5.5 Claiming Agentic Coding and Research Gains

OpenAI announced GPT-5.5, a new model family for ChatGPT and Codex.

The company says it is better at multi-step work, agentic coding, tool use, verification, and early research.

Access is being split across subscription tiers, with some of the strongest models reserved for higher plans.

API access is expected soon.