Is GPT-5.5 Instant out yet?
Yes.
About GPT-5.5 Instant
A model variant designed to improve health and wellness responses in ChatGPT with stronger reasoning.
How we confirmed it
Released via the API
May 5, 2026 at 12:00 PM UTC
An administrator marked this model available (silently).
Open detection source →Release timeline
- 2026-06-18 Official announcement or source
- 2026-07-02T02:07:50.673Z First official availability observed
- 2026-07-02T02:07:50.673Z Availability confirmed after the second check
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Benchmarks
LM Arena#28
gpt-5.5-instant · via LM Arena · 25,904 votes · captured Aug 16, 2026 · source
1473.3555292924889
Sourced metrics mirrored with attribution - not community sentiment.
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Model Pulse
How is this model behaving today? One check-in per person per day: the running record of “did they nerf it”. Resets at midnight UTC.
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Community consensus
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Compare GPT-5.5 Instant with another model →
Also waiting on: Gemini 3.5 Pro, Claude Fable 5.1, Claude Mythos 5.1, GLM-6
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