GPT-5.5 Instant Update

Updated GPT-5.5 Instant in ChatGPT and the API to improve response style and quality. Responses are now easier to read, more natural in everyday conversations, and better paced in practical help tasks, with fewer overly long or bullet-heavy responses.

Canvas is no longer available in GPT-5.5 Instant or GPT-5.5 Thinking. Writing and coding functionality is now supported directly in chat responses through writing blocks and code blocks. Paid users can continue using canvas for a limited time through legacy models until those models are sunset.