As of August 25, 2026, GPT-5.1 Thinking API pricing is $1.25 per million input tokens and $10.00 per million output tokens. A typical 100K-in / 20K-out request costs $0.33. Source: https://developers.openai.com/api/docs/pricing
Source: OpenAI API pricing (https://developers.openai.com/api/docs/pricing)
Input $/M
$1.25
Output $/M
$10.00
Blended / 1M
$11.25
100K / 20K request
$0.33
Percentile against every model with a published score on that eval. Click a row for the full board.
SWE-bench Verified against blended input+output $/M. Log price. GPT-5.1 Thinking is the green point.
| Context Window | 400K |
|---|---|
| Max Output | 128K tokens |
| Release Date | 2025-11-12 |
| Knowledge Cutoff | N/A |
| License | Proprietary |
| Throughput | 80 tok/s |
Same search as the hub. Pick any model, or jump into a priced matchup.
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As of August 25, 2026, GPT-5.1 Thinking OpenAI API pricing is $1.25 per million input tokens and $10.00 per million output tokens. Input tokens are the prompt you send; output tokens are the completion. Long answers therefore cost more than short ones even when the prompt stays the same. Source: https://developers.openai.com/api/docs/pricing
On this page the blended GPT-5.1 Thinking API cost is $11.25 for 1 million input tokens plus 1 million output tokens. That 1:1 mix is the comparison scale used across the LLM pricing table. A 3:1 mix (three million input tokens per one million output tokens), which some calculators use, would be about $13.75.
A typical GPT-5.1 Thinking API request with 100K input tokens and 20K output tokens costs about $0.33 at current rates as of August 25, 2026. Multiply that by daily or monthly volume to estimate spend. Caching, batch APIs, and volume discounts from OpenAI can bring the real invoice lower than the public list rate at https://developers.openai.com/api/docs/pricing.
GPT-5.1 Thinking supports a 400K token context window and can generate up to 128K output tokens per request. The context window is the total prompt plus conversation history the model can see in one call. Larger windows cost more when you fill them, because every input token is billed per million tokens.
No. GPT-5.1 Thinking is a proprietary model by OpenAI. The only public way to call it is OpenAI's API, billed per million input and output tokens. There is no self-host option for the weights.
GPT-5.1 Thinking currently reports HLE 23.7%, GPQA 88.1%, SWE-bench Verified 76.3%. See the performance table for the full eval set. Use those scores with the token prices above when you are choosing between a cheaper LLM and a frontier model. GPQA, SWE-bench, and HLE are the evals people usually compare first.
GPT-5.1 Thinking scores 76.3% on SWE-bench Verified. Pair that score with OpenAI API pricing on this page: a slightly worse SWE-bench model can still win if it is much cheaper per million tokens. Open the SWE-bench or coding leaderboard from the sidebar for the full ranking, then jump into an LLM comparison against a coding specialist.
Use the Compare picker on this page to start an LLM comparison. Search by model or provider, pick a second model, and AnotherWrapper opens a dedicated GPT-5.1 Thinking vs page with per-million-token prices, blended 1M-in / 1M-out cost, context window, throughput, and benchmarks. You can also open any model from the sidebar, or go back to the LLM pricing table to sort the full index.
The cheapest LLM alternative depends on whether you optimize for blended token cost, coding evals, or context window. Start with the popular matchups on this page, then sort the LLM pricing table by blended cost to see which hosted APIs undercut GPT-5.1 Thinking. Open-weight models can be cheaper still if you self-host, but that is not the same as OpenAI API pricing on this page.
GPT-5.1 Thinking is called through OpenAI's API with an API key. Bill against input and output tokens separately; cache or shorten prompts if spend is high. If you are shipping a full product, AnotherWrapper includes pre-built API routes and templates for OpenAI and 5+ other providers with auth, payments, and deployment already configured.
This GPT-5.1 Thinking page tracks the latest published OpenAI API pricing from OpenAI, quoted per million tokens. List rates can differ from invoices because of prompt caching, batch discounts, committed-use tiers, and private contracts. Official rate sheet: https://developers.openai.com/api/docs/pricing. Benchmark scores come from official publications and independent evals, not from a private lab run by AnotherWrapper.
GPT-5.1 Thinking has a measured throughput of about 80 tokens per second (tok/s). Throughput is how fast completions stream once the model starts generating; time-to-first-token can still lag under load. Faster APIs matter when you are building chat or agents, even if the per-million-token price is the same.
GPT-5.1 Thinking is a proprietary model from OpenAI. Current API pricing is $1.25 per million input tokens and $10.00 per million output tokens, with a 400K token context window. A blended 1M-in / 1M-out workload costs $11.25.
Rank it on the LLM leaderboard, SWE-bench, and Humanity's Last Exam.
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