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OpenAI model product

GPT-5.5-Instant

5 Instant is OpenAI's latest Instant model and the default ChatGPT model released on May 5, 2026.

Updated Aug 12, 2026. Default version: GPT-5.5 Instant

Compare
LLMBoard score53.7GPT-5.5 Instant
Coverage60%9 benchmark families
Context window400KTokens
Official input priceN/AOfficial price unavailable

On this page

  • Specification
  • Capability
  • Benchmarks
  • Arena
  • Runtime
  • Pricing
  • Versions
  • About
  • Compare
  • Similar models
  • FAQ

GPT-5.5-Instant Specifications

Technical details for the model's default version.

Version
GPT-5.5 Instant
Released
May 5, 2026
Knowledge cutoff
Aug 31, 2025
Parameters
N/A
Context window
400K
Max output
128K
Inputs
image, pdf, text
Outputs
text
Open weights
No
License
Proprietary

GPT-5.5-Instant Capability Profile

This profile uses the model's current scored version. Arena ratings and prices are shown separately.

GPT-5.5 Instant category scores

GPT-5.5-Instant Benchmark Results

Benchmark scores for GPT-5.5 Instant.

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HealthBench Consensus94.7%0440.0%CAug 11, 2026
HealthBench Hard22.9%07925.0%CAug 11, 2026
HealthBench51.4%08912.5%CAug 11, 2026
HealthBench Professional38.4%08912.5%CAug 11, 2026
OmniDocBench 1.587.5%101743.8%CAug 11, 2026
CharXiv-R81.6%154870.2%CAug 11, 2026
MMMU-Pro76.0%296656.9%CAug 11, 2026
GPQA85.6%5123478.5%CAug 11, 2026
AIME 202581.2%6811440.7%CAug 11, 2026

GPT-5.5-Instant Arena Results

Preference and agent-evaluation results for the default version.

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document style controloverall231455.48,442N/AJul 30, 2026
vision style controloverall241278.07,224N/AAug 6, 2026
text style controloverall261473.325,908N/AAug 10, 2026
documentoverall361401.68,442N/AJul 30, 2026
visionoverall441251.57,224N/AAug 6, 2026
text factualityoverall671444.325,908N/AAug 10, 2026
textoverall981419.525,908N/AAug 10, 2026

GPT-5.5-Instant Runtime Performance

Provider-specific output speed and catalog latency for GPT-5.5 Instant. Runtime does not affect the capability score.

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OpenAI42.14 tok/s1.377 s400K128KAug 11, 2026

Output Speed is generated output tokens received per second. Catalog latency is reported separately from observed provider TTFT.

GPT-5.5-Instant Pricing

Official vendor API pricing appears first, followed by individual provider offers.

Official API
N/A
Official provider
N/A
Lowest third-party
From $5 input, $30 output per 1M via ZenMux
Tracked offerings
1
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ZenMuxopenai/gpt-5.5-instantglobal$5$30400KAug 11, 2026

Official prices use only the vendor's configured official Provider and positive standard USD PAYG rates. Third-party offers remain explicitly labeled.

GPT-5.5-Instant Versions

Available versions of this model. The score column identifies the version used in the overall ranking.

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GPT-5.5 InstantMay 5, 202653.7N/A400K128KNoProprietary

What is GPT-5.5-Instant?

Key information about GPT-5.5-Instant and its available data.

5 Instant is OpenAI's latest Instant model and the default ChatGPT model released on May 5, 2026. 3 Instant. In the API, it is exposed through the chat-latest alias, which points to the latest Instant model used in ChatGPT.

Data as of 2026-08-11.

GPT-5.5-Instant vs nearby models

Open a comparison with the three ranked models immediately above and below this model.

GPT-5.5-InstantvsGrok 3GPT-5.5-InstantvsGLM 4.6GPT-5.5-InstantvsGrok 4 FastGPT-5.5-InstantvsMiniMax M2.1GPT-5.5-InstantvsSeed 2.0 LiteGPT-5.5-InstantvsMiMo V2 Omni

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FAQ

Common questions about GPT-5.5-Instant.

When was GPT-5.5-Instant released?

GPT-5.5-Instant's default version was released on May 5, 2026.

How much does GPT-5.5-Instant cost?

No official standard PAYG price is currently available for GPT-5.5-Instant. The lowest tracked third-party offer starts at $5 input and $30 output via ZenMux.

Who created GPT-5.5-Instant?

GPT-5.5-Instant was created by OpenAI.

What is the context window for GPT-5.5-Instant?

The default version has a 400K token context window.

Is GPT-5.5-Instant open weight?

No. The default version is not marked as having publicly available weights.

How many API providers offer GPT-5.5-Instant?

1 provider offerings are linked to the default version.

What models should I compare GPT-5.5-Instant with?

Nearby ranked alternatives include Grok 3, GLM 4.6, Grok 4 Fast.