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GPT-5.5 Instant

OpenAIGPTProprietary

Description

GPT-5.5 Instant is OpenAI's latest Instant model and the default ChatGPT model released on May 5, 2026. It improves factuality, everyday reasoning, image understanding, STEM answers, concision, conversational tone, and personalization over GPT-5.3 Instant. In the API, it is exposed through the chat-latest alias, which points to the latest Instant model used in ChatGPT.

Release Date
2026-05-05
Parameters
—
Context Length
—
Modalities
image, text

Capability Radar

80
general
0
coding
80
reasoning
77
scienceest.
0
agents
80
multimodal

Science uses a reasoning proxy when dedicated science benchmarks are unavailable.

Rankings

Domain#RankScoreSource
Multimodal Ranking19
85.0
LS

Benchmark Scores (LLM Stats)

Biology

GPQA85.6%SR

General

MMMU-Pro76.0%SR

Healthcare

HealthBench Consensus94.7%SR
HealthBench51.4%SR
HealthBench Professional38.4%SR
HealthBench Hard22.9%SR

Math

AIME 202581.2%SR

Multimodal

OmniDocBench 1.587.5%SR
CharXiv-R81.6%SR

AA Evaluation Indices

No AA evaluation data available

LLM Stats Category Scores

Structured Output
90
Biology
90
Chemistry
90
Physics
90
Vision
80
General
80
Math
80
Multimodal
80
Reasoning
80
Healthcare
40

Pricing

Input Price$5 / 1M tokens
Output Price$30 / 1M tokens
Blended Price (3:1)$11.25 / 1M tokens

Speed

No speed data available

Available Providers

(LS internal units)
ProviderInput PriceOutput Price
OpenAI5.0M30.0M

External Sources

LLM Stats