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GPT-5.1 Instant
🇺🇸OpenAI8mo
Context:400K tokens
Input:$1.25/1M
Output:$10/1M
Neura Index
76.3
Rank #39—
mediumCategory Profile
Benchmark Scores (5)
reasoning
| Benchmark | Score | Source |
|---|---|---|
| GPQA Diamond | 88.1 | verified |
math
| Benchmark | Score | Source |
|---|---|---|
| AIME 2025 | 94 | verified |
| FrontierMath | 26.7 | verified |
coding
| Benchmark | Score | Source |
|---|---|---|
Performance History
Similar Models
Frequently Asked Questions about GPT-5.1 Instant
What is GPT-5.1 Instant's Neura Intelligence Index score?▾
GPT-5.1 Instant by OpenAI scores 76.3 out of 100 on the Neura Intelligence Index, ranking #39 among tracked AI models. This composite score is computed from 5 individual benchmarks across coding, math, reasoning, and language categories.
How much does GPT-5.1 Instant cost to use?▾
GPT-5.1 Instant costs $1.25/1M input tokens and $10/1M output tokens via API. At a typical 3:1 input-to-output ratio with 1M tokens/day usage, the estimated monthly cost is approximately $103.
Is GPT-5.1 Instant open source?▾
No, GPT-5.1 Instant is a proprietary model by OpenAI. It is only accessible via their API.
What is GPT-5.1 Instant's context window?▾
GPT-5.1 Instant supports a context window of 400K tokens, allowing it to process very long documents, codebases, and conversations in a single request.
What benchmark does GPT-5.1 Instant perform best on?▾
GPT-5.1 Instant achieves its highest score on AIME 2025 with a score of 94.0%. This benchmark evaluates american invitational mathematics examination 2025 — competition-level math problems.