GPT-5.5 Instant
β ActiveDefault ChatGPT model optimized for fast, accurate, concise everyday assistance and personalization
Context Window
128K
Input Price
N/A/1M
Available in the API through the chat-latest alias
Output Price
N/A/1M
Released
May 5, 2026
Capabilities
textvisionweb-searchpersonalizationfunction-calling
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Get API Access βVersion History
May 28, 2026Update
Updated in ChatGPT and the API for more natural, better-paced responses with fewer overly long or bullet-heavy answers
May 5, 2026New Release
GPT-5.5 Instant rolled out as ChatGPT's default model for all users and as chat-latest in the API, replacing GPT-5.3 Instant