GPT-5.1 pricing & benchmarks
GPT-5.1 is available from OpenAI at $1.25 per million input tokens and $10.00 per million output tokens ($3.44 blended at 3:1). It accepts up to 400,000 tokens of context. GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning...
Pricing
Per million tokens · OpenRouter
Input$1.25
Output$10.00
Blended (3:1)$3.44
Specification
openai/gpt-5.1
Context window400K
Max output128K
ReleasedNov 2025
LicenceProprietary
Modalitiesin:text, in:image, in:file, out:text
Benchmarks
Independently run — not vendor self-reports. Every score links its source.
| Benchmark | Score | Config | Run | Source |
|---|---|---|---|---|
| GPQA Diamond | 87.6% ±1.9 | high effort | 2025-11-13 | Independently run · Epoch AI |
| SWE-bench Verified | 68.0% ±2.1 | high effort | 2026-02-18 | Independently run · Epoch AI |
| SimpleQA Verified | 48.9% ±1.6 | high effort | 2025-12-09 | Independently run · Epoch AI |
| OTIS Mock AIME | 88.6% ±4.0 | high effort | 2025-11-13 | Independently run · Epoch AI |
Scores published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0.
Cheaper models that score at least as well on GPQA Diamond
Strictly lower blended price AND an equal-or-higher GPQA Diamond score. One benchmark is one dimension — a model that wins here may still be weaker at your specific task.
| Model | Provider | Blended $/1M | GPQA Diamond | |
|---|---|---|---|---|
| DeepSeek V4 Flash 0731 | DeepSeek | $0.113 (−97%) | 91.0% | Compare → |
| GPT-5.6 Luna | OpenAI | $0.225 (−93%) | 91.6% | Compare → |
| GLM 5.2 | Zhipu AI | $0.387 (−89%) | 91.9% | Compare → |
| DeepSeek V4 Pro | DeepSeek | $0.544 (−84%) | 90.9% | Compare → |
| Qwen3.6 Plus | Alibaba | $0.731 (−79%) | 88.4% | Compare → |
Where to run GPT-5.1
5 options across 2 providers · 4.0× between cheapest and dearest. Blended at 3:1. ⚠ marks an option serving less context than the best available, or re-pricing above a prompt-length threshold. Bracketed labels are the provider's own service tier or region.
| Host | Blended $/1M | In / Out | Context | Uptime 24h |
|---|---|---|---|---|
| OpenAI (default/flex) | $1.72 | $0.625 / $5.00 | 400K | 99.7% |
| OpenAI (default) | $3.44 | $1.25 / $10.00 | 400K | 99.7% |
| Azure | $3.44 | $1.25 / $10.00 | 400K | 100.0% |
| Azure (swedencentral) | $3.78 | $1.38 / $11.00 | 400K | — |
| OpenAI (default/priority) | $6.88 | $2.50 / $20.00 | 400K | 99.7% |
Host prices and uptime from OpenRouter, synced 2026-08-08.
Compare GPT-5.1
FAQ
How much does GPT-5.1 cost?
GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens on OpenRouter. At a 3:1 input:output mix that blends to $3.44 per million tokens.
What is GPT-5.1's context window?
GPT-5.1 accepts up to 400,000 tokens of context, and can generate up to 128,000 output tokens.
How good is GPT-5.1 on benchmarks?
GPT-5.1 scores 87.6% on GPQA Diamond, independently run and published by Epoch AI. 4 benchmark results are listed on this page, each with its run date and source.
Is there a cheaper model as good as GPT-5.1?
Yes — 5 models in our catalogue cost less per token than GPT-5.1 and score at least as high on the same benchmark. The cheapest is DeepSeek V4 Flash 0731 at $0.113 per million tokens blended.