Model Details
Where is GPT-5.1 a perfect fit?
- Agentic workflows that need a reasoning model and tool-calling.
- Fast, low-latency tasks using the “no reasoning” mode (e.g., simple prompts, search).
- Coding and developer tasks: with its apply_patch and shell-tools, it’s ideal for automated code editing and executing shell commands.
- Memory-heavy chat or multi-turn applications where extended prompt caching matters.
Quick Model Estimate
Your GPT-5.1 Cost Estimate
💰 Total Cost
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for 1000 input + 1000 output tokens
Cost Breakdown
Prices are watched for changes and checked against the provider's own page.
Pricing
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 OpenAI | Text | Standard | $1.2500 | $10.0000 | $0.1250 | 400,000 tokens | → |
| OpenAI | Text | Batch | $0.6250 | $5.0000 | $0.0625 | 400,000 tokens | → |
| OpenAI | Text | Flex | $0.6250 | $5.0000 | $0.0625 | 400,000 tokens | → |
| OpenAI | Text | Priority | $2.5000 | $20.0000 | $0.2500 | 400,000 tokens | → |
No longer offered by
The last prices each provider charged for GPT-5.1 before it stopped offering it. These are no longer on offer. Each row links to that provider's price history.
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 Perplexity | 28th Sep 2026Provider stopped offering it | Text | Standard | $1.2500 | $10.0000 | $0.1250 | 400,000 tokens | → |
Recent changes
When GPT-5.1 was newly listed on a provider, moved to legacy or deprecated, or retired.
Other Models in the GPT-5.1 Family
FAQs about GPT-5.1
How much does GPT-5.1 cost per 1M tokens?
GPT-5.1 costs between $0.625 and $2.50 per million input tokens, and between $5.00 and $20.00 per million output tokens. The range covers Standard, Batch, Flex and Priority pricing.
What does a typical workload cost with GPT-5.1?
1,000 requests of 2,000 input and 500 output tokens each — 2,000,000 input and 500,000 output tokens in total — costs $3.75 with GPT-5.1 at its lowest rates. Use the calculator on this page for your own volumes.
Where can I use GPT-5.1?
GPT-5.1 is available through OpenAI, from $0.625 per million input tokens.
Is there cheaper GPT-5.1 pricing than the standard rate?
Yes. Batch pricing for GPT-5.1 starts at $0.625 per million input tokens against $1.25 on the standard tier, about 50% lower.
What is GPT-5.1's context window?
GPT-5.1 has a context window of 400,000 tokens, and returns up to 128,000 tokens in a single response.
Is GPT-5.1 still available?
GPT-5.1 is a legacy model and is scheduled for retirement on 1 April 2027. The replacement is GPT-6 Sol.