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OpenAI: GPT-5.1 API Pricing
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...
How much does OpenAI: GPT-5.1 cost for a real workload?
At 10M input + 2M output tokens per month, OpenAI: GPT-5.1 costs about $32.5 ($12.5 input + $20 output). Try your own volumes in the cost calculator.
What is the official OpenAI: GPT-5.1 price?
| Official (openai) | Catalog (OpenRouter) | |
|---|---|---|
| Input /1M | $1.25 | $1.25 |
| Output /1M | $10 | $10 |
| Cached input /1M | $0.125 | $0.125 |
✓ Matches the official list price. Source: openai official pricing page, checked 2026-10-21.
What are cheaper alternatives to OpenAI: GPT-5.1?
- Google: Gemini 3.5 Flash — $1.5 in / $9 out per 1M
- Pareto 26.9 — $2.5 in / $7.5 out per 1M
- OpenAI: o3 — $2 in / $8 out per 1M
- OpenAI: GPT-4.1 — $2 in / $8 out per 1M
- Perplexity: Sonar Reasoning Pro — $2 in / $8 out per 1M
- Perplexity: Sonar Deep Research — $2 in / $8 out per 1M
Compare OpenAI: GPT-5.1 with other models
OpenAI: GPT-5.1 vs OpenAI: gpt-oss-20bOpenAI: GPT-5.1 vs OpenAI: gpt-oss-20b (batch)OpenAI: GPT-5.1 vs OpenAI: gpt-oss-120b (batch)OpenAI: GPT-5.1 vs OpenAI: GPT-5 Nano (batch)OpenAI: GPT-5.1 vs OpenAI: GPT-4.1 Nano (batch)OpenAI: GPT-5.1 vs OpenAI: GPT-6 Luna Pro (batch)
Frequently asked questions
How much does OpenAI: GPT-5.1 cost?
OpenAI: GPT-5.1 costs $1.25 per 1M input tokens and $10 per 1M output tokens (list price, snapshot October 21, 2026). At 10M input + 2M output tokens per month that is about $32.5.
What is the context window of OpenAI: GPT-5.1?
OpenAI: GPT-5.1 has a context window of 400,000 tokens and can return up to 128,000 output tokens per response.
What are cheaper alternatives to OpenAI: GPT-5.1?
Cheaper models include Google: Gemini 3.5 Flash ($1.5 in / $9 out), Pareto 26.9 ($2.5 in / $7.5 out), OpenAI: o3 ($2 in / $8 out). See the full list on this page.
Is OpenAI: GPT-5.1 free to use?
No. OpenAI: GPT-5.1 is a paid model at $1.25 input / $10 output per 1M tokens. 20 free models are listed on the free models page.
What is the official price of OpenAI: GPT-5.1?
On openai's official pricing page (checked 2026-10-21), OpenAI: GPT-5.1 is listed at $1.25 per 1M input tokens and $10 per 1M output tokens. The catalog price tracked on this page matches it exactly.
Provider: openai · Model ID: openai/gpt-5.1 · Modality: text+image+file->text · Price snapshot October 21, 2026, refreshed daily. How we collect prices