GPT-5.1 Chat API Pricing
OpenAI · released 2025-11-13
Also searched as: GPT 5.1 Chat pricing · 5.1 Chat price
GPT-5.1 Chat price
0.125¢ / 1K
1.00¢ / 1K
0.344¢ / 1K
Single public source; verify on the official site
Official list price from OpenAI, as recorded by litellm
What it actually costs
| Workload | Tokens | Cost |
|---|---|---|
| Short chat reply | 500 in / 300 out | 0.362¢ |
| RAG query | 4,000 in / 500 out | $0.0100 |
| Long document summary | 50,000 in / 1,000 out | $0.0725 |
| Code review of a 2k-line file | 30,000 in / 2,000 out | $0.0575 |
| 1,000 chat replies/day for 30 days | 30,000 × (500 in / 300 out) | $108.75 |
Cost = (input tokens ÷ 1,000,000 × $1.25) + (output tokens ÷ 1,000,000 × $10.00).
Benchmarks
| Benchmark | Value | Source | As of |
|---|---|---|---|
| Epoch Capabilities Index (ECI) | No public data yet | ||
| Epoch Mock AIME accuracy | No public data yet | ||
| Epoch FrontierMath (T1–3) accuracy | No public data yet | ||
| Arena text rating | No public data yet | ||
| Arena coding rating (human preference votes, not task accuracy) | No public data yet | ||
| Arena math rating | No public data yet | ||
| Arena WebDev rating | No public data yet | ||
More from OpenAI
| Model | Released | Blended $/1M |
|---|---|---|
| GPT-6.1 Terra | 2026-10-26 | $2.00 |
| GPT-6.1 Sol | 2026-09-29 | $4.00 |
| GPT-6 Sol | 2026-09-22 | $4.00 |
| GPT-6 Luna | 2026-09-22 | $0.20 |
| GPT-Live 1 | 2026-09-10 | — |
| GPT Image 2.5 Sunburst | 2026-09-08 | $11.25 |
| GPT Image 2.5 Flare | 2026-09-08 | $11.25 |
| GPT-6 Astra (Fast) | 2026-09-04 | — |
Count tokens & estimate cost for GPT-5.1 Chat
Prices: OpenAI's official list price as recorded by litellm; benchmarks: see sources below; last synced 2026-11-06.
FAQ
Who develops GPT-5.1 Chat?
GPT-5.1 Chat is developed by OpenAI, released 2025-11-13.
How much does GPT-5.1 Chat cost per million tokens?
GPT-5.1 Chat costs $1.25 per 1M input tokens and $10.00 per 1M output tokens ($3.4375 blended), per OpenAI's official list price as recorded by litellm.
What is the GPT-5.1 Chat API price?
The GPT-5.1 Chat API price is $1.25 per 1M input tokens and $10.00 per 1M output tokens ($3.4375 per 1M blended).
How much does GPT-5.1 Chat cost for a typical request?
A short chat reply (500 in / 300 out tokens) costs about 0.362¢ on GPT-5.1 Chat, at $1.25/1M input and $10.00/1M output.
Is GPT-5.1 Chat free?
GPT-5.1 Chat's official API list price is $1.25 per 1M input tokens and $10.00 per 1M output tokens. This site tracks list prices only, not free tiers or trial credits — check OpenAI's site for those.
Where does this data come from?
Pricing for GPT-5.1 Chat comes from models.dev and LiteLLM (open MIT-licensed catalogs); benchmark scores come from Epoch AI and LMArena (open CC BY 4.0 licenses) — see /data-sources/. Last synced 2026-11-06.