OpenAI · OpenAI (GPT / ChatGPT)
GPT-5.5
CurrentDefaultCurrent flagship general-purpose model; strong coding, reasoning, writing, and agentic tasks. Tiered pricing above a context threshold.
About this version
GPT‑5.5 is the current flagship model in the ChatGPT family, released on 23 April 2026 with a knowledge cutoff of January 2026. It offers an expanded context window of one million tokens and is positioned for strong performance across coding, reasoning, writing, and agentic tasks, with tiered pricing applied beyond a certain context usage threshold.
- API string
- gpt-5.5
- Context window
- 1M ctx
- Knowledge cutoff
- Jan 1, 2026
- Tier
- Flagship
- Released
- Apr 23, 2026
Release & change timeline
1 event- Release
GPT-5.5 released
Current flagship; 1M context, $5/$30 per 1M tokens.
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