GPT-5.5 Instant (May 2026)
OpenAIGPT
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
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Context Length
—
Modalities
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Capability Radar
31
general
50
coding
85
reasoning
60
scienceest.
75
agents
85
multimodal
Science uses a reasoning proxy when dedicated science benchmarks are unavailable.
Rankings
| Domain | #Rank | Score | Source |
|---|---|---|---|
| Code Ranking | 104 | 69.0 | AA |
| General Ranking | 142 | 61.0 | AA |
| Science | 77 | 70.0 | AA |
Benchmark Scores (LLM Stats)
Biology
GPQA
85.6%SR
General
MMMU-Pro
76.0%SR
Healthcare
HealthBench Consensus
94.7%SR
HealthBench
51.4%SR
HealthBench Professional
38.4%SR
HealthBench Hard
22.9%SR
Math
AIME 2025
81.2%SR
Multimodal
OmniDocBench 1.5
87.5%SR
CharXiv-R
81.6%SR
AA Evaluation Indices
Intelligence Index33.5
Gpqa0.8
Ifbench0.7
Lcr0.6
Scicode0.5
Tau20.5
Terminalbench Hard0.4
Hle0.2
LLM Stats Category Scores
Physics90
Structured Output90
Biology90
Chemistry90
Math80
Multimodal80
Reasoning80
General80
Vision80
Healthcare50
Pricing
Input Price$5 / 1M tokens
Output Price$30 / 1M tokens
Blended Price (3:1)$11.25 / 1M tokens
Speed
Tokens/sec0.0
Time to First Token0.00s
Time to Answer0.00s
Provider Price Ranking
Provider Price Ranking
1 providers
ProviderInputOutput
1OpenAIPRIMARY
$5
$30
Compare pricing across different API providers for this model.