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 17, 2026. Default version: GPT-5.5 Instant
LLMBoard Score53.5GPT-5.5 Instant
Coverage60%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 | Score94.7% | Rank04 | Participants4 | Percentile0.0% | EvidenceC | Evaluated |
| BenchmarkHealthBench Hard | Score22.9% | Rank07 | Participants9 | Percentile25.0% | EvidenceC | Evaluated |
| BenchmarkHealthBench | Score51.4% | Rank08 | Participants9 | Percentile12.5% | EvidenceC | Evaluated |
| BenchmarkHealthBench Professional | Score38.4% | Rank08 | Participants9 | Percentile12.5% | EvidenceC | Evaluated |
| BenchmarkOmniDocBench 1.5 | Score87.5% | Rank11 | Participants18 | Percentile41.2% | EvidenceC | Evaluated |
| BenchmarkCharXiv-R | Score81.6% | Rank17 | Participants51 | Percentile68.0% | EvidenceC | Evaluated |
| BenchmarkMMMU-Pro | Score76.0% | Rank29 | Participants68 | Percentile58.2% | EvidenceC | Evaluated |
| BenchmarkGPQA | Score85.6% | Rank55 | Participants239 | Percentile77.3% | EvidenceC | Evaluated |
| BenchmarkAIME 2025 | Score81.2% | Rank68 | Participants115 | Percentile41.2% | EvidenceC | 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 |
|---|
| Arenadocument style control | Categoryoverall | Rank23 | Rating / score1455.4 | Votes8,442 | ObservationsN/A | Result date |
| Arenavision style control | Categoryoverall | Rank24 | Rating / score1278.0 | Votes7,224 | ObservationsN/A | Result date |
| Arenatext style control | Categoryoverall | Rank27 | Rating / score1473.4 | Votes25,900 | ObservationsN/A | Result date |
| Arenadocument | Categoryoverall | Rank36 | Rating / score1401.6 | Votes8,442 | ObservationsN/A | Result date |
| Arenavision | Categoryoverall | Rank44 | Rating / score1251.5 | Votes7,224 | ObservationsN/A | Result date |
| Arenatext factuality | Categoryoverall | Rank68 | Rating / score1444.3 | Votes25,900 | ObservationsN/A | Result date |
| Arenatext | Categoryoverall | Rank99 | Rating / score1419.6 | Votes25,900 | 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 Speed100 tok/s | Catalog Latency2 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, pdf, 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 | LLMBoard53.5 | 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.
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 2026-08-17.
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, MAI Thinking 1, GLM 4.6.