GPT-5.1 pricing
API list price by OpenAI · same on Azure · checked Oct 23, 2026
$1.25 / $10per 1M tokens in / out
$0.13cache read · −90%
#136on OpenRouter by tokens · 31.5B / week
Price sheetper 1M tokens
| Input | $1.25 | list |
| Output | $10 | |
| Cache read | $0.13 | −90% vs input |
| Context · max output | 400K · 128K | tokens |
Where to buy2 providers · per 1M tokens
| Provider | Input | Output | Context |
|---|---|---|---|
| Azure | $1.25 | $10 | 400K |
| OpenAIlab | $1.25 | $10 | 400K |
In OpenAI's line-upper 1M in / out
| o3 Mini High | $1.10 / $4.40 | −44% |
| o4 Mini High | $1.10 / $4.40 | −44% |
| GPT-3.5 Turbo 16k | $3 / $4 | −5% |
| GPT-5.1 | $1.25 / $10 | this model |
| GPT-5.1 (2025-11-13) | $1.25 / $10 | 0% |
| o3 | $2 / $8 | +2% |
| GPT-6.1 Sol | $2 / $10 | +16% |
Cheaper for the same workvs GPT-5.1
| Muse Spark 1.3 max | -42% | score ×3.6 | $1.60 |
| Grok 4.7 xhigh | -13% | score ×3.5 | $3.74 |
| MiMo v2.6 Pro thinkingOpen | -84% | score ×3.5 | $0.13 |
| Qwen3.8 Max (0902) thinking | -13% | score ×3.4 | $5.41 |
| DeepSeek V4.1 Flash 1017 maxOpen | -85% | score ×3.4 | $0.26 |
Pricing questions
How much does GPT-5.1 cost?›
$1.25 per 1M input tokens and $10 per 1M output tokens on OpenAI's API and Azure. Cached input is $0.13.
Is GPT-5.1 free to use?›
There is no free API tier.
How much does prompt caching save?›
Cache reads cost $0.13 per 1M, 90% below the input price.
Is GPT-5.1 cheaper than GPT-5?›
It costs the same per token: $1.25 / $10.
What is a cheaper alternative to GPT-5.1?›
Muse Spark 1.3 at max effort costs -42% per task with a score ×3.6 on Humanity's Last Exam.