OpenAI Makes GPT-5.5 Instant the New Default Model for ChatGPT
OpenAI quietly swapped ChatGPT’s default brain to GPT-5.5 Instant, the fast model most users now talk to, replacing GPT-5.3 Instant.
OpenAI quietly swapped the brain behind everyday ChatGPT, making GPT-5.5 Instant the model most users now talk to by default.
The short version
- GPT-5.5 Instant replaces GPT-5.3 Instant as ChatGPT’s default for most users.
- It follows the wider GPT-5.5 rollout that began reaching paid tiers in April.
- “Instant” models prioritise fast, low-latency responses for routine queries.
Context
The change is part of a steady cadence of model updates as OpenAI iterates on speed, cost and capability across its lineup.
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