All prices › OpenAI › GPT-5.1
GPT-5.1 API pricing
As of October 16, 2026, GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens on the OpenAI API. Cached input is $0.125 per million. OpenAI plans to retire it on April 1, 2027.
Retires Apr 1 2027
It is the 15th cheapest of 36 OpenAI models tracked here, by blended price. The closest Standard-tier model from another provider is Gemini 2.5 Pro (Google) at $1.25 / $10.00, the same blended price. Same list price as Gemini 2.5 Pro, GPT-5, GPT-5 Search API. First listed in the LiteLLM price data on November 13, 2025.
Input / 1M tokens$1.25
Output / 1M tokens$10.00
Context window272K
Max output128K
Every published rate
| Rate | Per 1M tokens |
|---|---|
| Input (standard) | $1.25 |
| Output (standard) | $10.00 |
| Cached input (read) | $0.125 |
| Batch input | $0.625 |
| Batch output | $5.00 |
What it costs in practice
| Task | Tokens | Per request | Per 1,000 requests |
|---|---|---|---|
| Chatbot reply | 1,000 in / 500 out | $0.0063 | $6.25 |
| Summarize a long document | 20,000 in / 1,000 out | $0.04 | $35.00 |
| Coding agent step | 50,000 in / 2,000 out | $0.08 | $82.50 |
Standard rates, no caching or batch discount. Compare your own numbers across all models →
Price history
| Date | Model | Change |
|---|---|---|
| 2026-01-14 | GPT-5.1 | Context window: 400K → 272K (-32%) source |
| 2026-01-13 | GPT-5.1 | Context window: 272K → 400K (+47%) source |
| 2025-11-13 | GPT-5.1 | New model listed: $1.25 in / $10 out source |
Dates are when each change first appeared in the LiteLLM price data, usually within days of the provider's announcement.
Details
| Provider | OpenAI |
| Price tier | Standard |
| Features | Vision, Reasoning, Prompt caching, Tool use, PDF input, Web search |
| API model names | gpt-5.1, gpt-5.1-2025-11-13 |
| Retirement date | April 1, 2027 |
| Official pricing | developers.openai.com |
Models at a similar price
| Model | Input / 1M | Output / 1M |
|---|---|---|
| Gemini 3.5 Flash | $1.50 | $9.00 |
| Gemini 2.5 Pro | $1.25 | $10.00 |
| GPT-5 | $1.25 | $10.00 |
| GPT-5 Search API | $1.25 | $10.00 |
| GPT-4.1 | $2.00 | $8.00 |
| o3 | $2.00 | $8.00 |
Other OpenAI models
| Model | Input / 1M | Output / 1M |
|---|---|---|
| GPT-4 | $30.00 | $60.00 |
| GPT-5.6 Cyber | $12.50 | $75.00 |
| GPT-5.5 Cyber | $12.50 | $75.00 |
| o1 | $15.00 | $60.00 |
| GPT-6 Astra | $10.00 | $50.00 |
| GPT-4 Preview | $10.00 | $30.00 |
| GPT-4 Turbo | $10.00 | $30.00 |
| GPT-5.5 | $5.00 | $30.00 |
| GPT-Rosalind Research | $5.00 | $25.00 |
| GPT-Rosalind Discovery | $5.00 | $25.00 |
| GPT-5.6 | $4.00 | $20.00 |
| GPT-5.6 Sol | $4.00 | $20.00 |
| GPT-5.4 | $2.50 | $15.00 |
| GPT-5.2 | $1.75 | $14.00 |
| GPT-5.6 Terra | $2.00 | $12.00 |
| GPT-4o | $2.50 | $10.00 |
| GPT-6 Sol | $2.00 | $10.00 |
| GPT-6.1 Sol | $2.00 | $10.00 |
| GPT-4.1 | $2.00 | $8.00 |
| o3 | $2.00 | $8.00 |
| GPT-5 | $1.25 | $10.00 |
| GPT-5 Search API | $1.25 | $10.00 |
| GPT-3.5 Turbo 16K | $3.00 | $4.00 |
| o3 Mini | $1.10 | $4.40 |
| o4 Mini | $1.10 | $4.40 |
| GPT-5.4 Mini | $0.75 | $4.50 |
| GPT-3.5 Turbo | $0.50 | $1.50 |
| GPT-4.1 Mini | $0.40 | $1.60 |
| GPT-5 Mini | $0.25 | $2.00 |
| GPT-5.4 Nano | $0.20 | $1.25 |
| GPT-5.6 Luna | $0.20 | $1.20 |
| GPT-4o Mini | $0.15 | $0.60 |
| GPT-6 Luna | $0.10 | $0.50 |
| GPT-4.1 Nano | $0.10 | $0.40 |
| GPT-5 Nano | $0.05 | $0.40 |