OpenAI model product
GPT-5.5-Instant
5-Instant is an OpenAI large language model released as the default ChatGPT model on May 5, 2026.
Updated Sep 8, 2026. Default version: GPT-5.5 Instant
LLMBoard Score52.1GPT-5.5 Instant
Coverage0%9 benchmark families
Context window400KTokens
Official input priceN/AOfficial price unavailable
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 Benchmark Results
Benchmark scores for GPT-5.5 Instant.
Sort by
Benchmark | Score | Rank | Participants | Percentile | Evidence | Evaluated |
|---|
| BenchmarkHealthBench Consensus | Score94.70% | Rank04 | Participants4 | Percentile0.00% | EvidenceC | Evaluated |
| BenchmarkHealthBench Hard | Score22.90% | Rank07 | Participants9 | Percentile25.00% | EvidenceC | Evaluated |
| BenchmarkHealthBench | Score51.40% | Rank08 | Participants9 | Percentile12.50% | EvidenceC | Evaluated |
| BenchmarkHealthBench Professional | Score38.40% | Rank09 | Participants10 | Percentile11.11% | EvidenceC | Evaluated |
| BenchmarkOmniDocBench 1.5 | Score87.50% | Rank11 | Participants18 | Percentile41.18% | EvidenceC | Evaluated |
| BenchmarkLM Arena Document Style Control | Score1,455.45 rating | Rank19 | Participants33 | Percentile43.75% | EvidenceA | Evaluated |
| BenchmarkLM Arena Vision Style Control | Score1,277.64 rating | Rank19 | Participants107 | Percentile83.02% | EvidenceA | Evaluated |
| BenchmarkCharXiv-R | Score81.60% | Rank21 | Participants55 | Percentile62.96% | EvidenceC | Evaluated |
| BenchmarkLM Arena Text Style Control | Score1,473.71 rating | Rank25 | Participants210 | Percentile88.52% | EvidenceA | Evaluated |
| BenchmarkMMMU-Pro | Score76.00% | Rank29 | Participants69 | Percentile58.82% | EvidenceC | Evaluated |
| BenchmarkLM Arena Document | Score1,401.60 rating | Rank32 | Participants33 | Percentile3.13% | EvidenceA | Evaluated |
| BenchmarkLM Arena Vision | Score1,251.24 rating | Rank40 | Participants107 | Percentile63.21% | EvidenceA | Evaluated |
| BenchmarkLM Arena Text Factuality | Score1,443.99 rating | Rank58 | Participants121 | Percentile52.50% | EvidenceA | Evaluated |
| BenchmarkGPQA | Score85.60% | Rank59 | Participants247 | Percentile76.42% | EvidenceC | Evaluated |
| BenchmarkAIME 2025 | Score81.20% | Rank71 | Participants119 | Percentile40.68% | EvidenceC | Evaluated |
| BenchmarkLM Arena Text | Score1,419.82 rating | Rank81 | Participants210 | Percentile61.72% | EvidenceA | Evaluated |
GPT-5.5-Instant Arena Results
Preference and agent-evaluation results for the default version.
Sort by
Arena | Category | Rank | Rating / score | Votes | Observations | Result date |
|---|
| Arenavision style control | Categoryhumor | Rank07 | Rating / score1,295.03 | Votes243 | ObservationsN/A | Result date |
| Arenatext style control | Categoryspanish | Rank08 | Rating / score1,486.63 | Votes783 | ObservationsN/A | Result date |
| Arenatext style control | Categorykorean | Rank10 | Rating / score1,457.89 | Votes426 | ObservationsN/A | Result date |
| Arenavision style control | Categorydiagram | Rank11 | Rating / score1,313.03 | Votes2,080 | ObservationsN/A | Result date |
| Arenavision style control | Categoryenglish | Rank13 | Rating / score1,280.12 | Votes3,158 | ObservationsN/A | Result date |
| Arenatext style control | Categoryjapanese | Rank16 | Rating / score1,459.53 | Votes258 | ObservationsN/A | Result date |
| Arenatext style control | Categorypolish | Rank17 | Rating / score1,485.41 | Votes557 | ObservationsN/A | Result date |
| Arenadocument style control | Categoryoverall | Rank19 | Rating / score1,455.45 | Votes8,442 | ObservationsN/A | Result date |
| Arenatext style control | Categorynon english | Rank19 | Rating / score1,469.63 | Votes13,491 | ObservationsN/A | Result date |
| Arenavision style control | Categoryoverall | Rank19 | Rating / score1,277.64 | Votes7,225 | ObservationsN/A | Result date |
| Arenatext style control | Categorycreative writing | Rank20 | Rating / score1,456.26 | Votes4,104 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry business and management and financial operations | Rank20 | Rating / score1,475.99 | Votes5,434 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry entertainment and sports and media | Rank20 | Rating / score1,452.22 | Votes5,475 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry life and physical and social science | Rank21 | Rating / score1,491.99 | Votes4,235 | ObservationsN/A | Result date |
| Arenavision style control | Categorycreative writing vision | Rank21 | Rating / score1,260.69 | Votes331 | ObservationsN/A | Result date |
| Arenavision style control | Categoryocr | Rank21 | Rating / score1,285.66 | Votes5,390 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry writing and literature and language | Rank22 | Rating / score1,462.07 | Votes6,291 | ObservationsN/A | Result date |
| Arenatext style control | Categoryexclude ties | Rank24 | Rating / score1,484.96 | Votes20,243 | ObservationsN/A | Result date |
| Arenatext style control | Categoryfrench | Rank24 | Rating / score1,489.54 | Votes1,009 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry medicine and healthcare | Rank24 | Rating / score1,487.86 | Votes1,972 | ObservationsN/A | Result date |
| Arenatext style control | Categorymulti turn | Rank24 | Rating / score1,482.76 | Votes4,908 | ObservationsN/A | Result date |
| Arenatext style control | Categoryoverall | Rank25 | Rating / score1,473.71 | Votes25,860 | ObservationsN/A | Result date |
| Arenatext style control | Categoryrussian | Rank26 | Rating / score1,477.83 | Votes2,796 | ObservationsN/A | Result date |
| Arenavision | Categoryhumor | Rank27 | Rating / score1,270.60 | Votes243 | ObservationsN/A | Result date |
| Arenavision style control | Categoryhomework | Rank29 | Rating / score1,281.96 | Votes1,131 | ObservationsN/A | Result date |
| Arenatext style control | Categorygerman | Rank30 | Rating / score1,465.56 | Votes426 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry legal and government | Rank30 | Rating / score1,477.65 | Votes2,182 | ObservationsN/A | Result date |
| Arenatext style control | Categoryhard prompts | Rank31 | Rating / score1,491.04 | Votes17,462 | ObservationsN/A | Result date |
| Arenadocument | Categoryoverall | Rank32 | Rating / score1,401.60 | Votes8,442 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry software and it services | Rank32 | Rating / score1,502.44 | Votes10,641 | ObservationsN/A | Result date |
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
Sort by
Provider | Provider model ID | Region | Input / 1M | Output / 1M | Context | Updated |
|---|
| ProviderZenMux | Provider model IDopenai/gpt-5.5-instant | Regionglobal | Input / 1M$5 | Output / 1M$30 | Context400K | Updated |
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 Runtime Performance
Provider-specific output speed and catalog latency for GPT-5.5 Instant. Runtime does not affect the capability score.
Sort by
Provider | Output Speed | Catalog Latency | Max Input | Max Output | Updated |
|---|
| ProviderOpenAI | Output Speed206.89 tok/s | Catalog Latency1.89 s | Max Input400K | Max Output128K | Updated |
Output Speed is generated output tokens received per second. Catalog latency is reported separately from observed provider TTFT.
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, text
- Outputs
- text
- Open weights
- No
- License
- Proprietary
GPT-5.5-Instant Versions
Available versions of this model. The score column identifies the version used in the overall ranking.
Sort by
Version | Released | LLMBoard | Parameters | Context | Max output | Open weights | License |
|---|
| VersionGPT-5.5 Instant | Released | LLMBoard52.10 | ParametersN/A | Context400K | Max output128K | Open weightsNo | LicenseProprietary |
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What is GPT-5.5-Instant?
Key information about GPT-5.5-Instant and its available data.
3 Instant in factuality, everyday reasoning, image understanding, STEM answers, concision, conversational tone, and personalization. In the API, it is available through the chat-latest alias, which points to the latest Instant model used in ChatGPT.
Data as of 2026-09-08.
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.