GPT-5.1
Successor to GPT-5, released November 2025, adding a no-reasoning mode and adaptive reasoning that scales thinking with prompt complexity. Positioned for coding and agentic tasks.
- Input
- $1.25 / 1M tokens
- Output
- $10.00 / 1M tokens
About $32.50 for 10M input and 2M output tokens. Estimate yours
2 providers
Key Specifications
- Context window
- 400K tokens
- Max output
- 128K tokens
- Knowledge cutoff
- Inputs
- Text, Image Outputs: Text
GPT-5.1 pricing by provider
| Provider | Input / 1M tokens | Output / 1M tokens | Cost at 10M in + 2M out | |
|---|---|---|---|---|
|
OpenAI
Creator
Cheapest
|
$1.25 | $10.00 | $32.50 | View |
|
Azure
|
$1.25 | $10.00 | $32.50 | View |
Heads up: We do our best to keep these specs & prices accurate. However, cloud costs may fluctuate based on region, usage, and other factors not listed here. These are estimates based on common setups and are for informational purposes only. Always verify current rates & exact specs with the provider before provisioning. LLM rates are base-tier, on-demand prices per 1M tokens; cached-input, batch and long-context tiers are not included.
Compare every model at this volume in the LLM cost calculator.
Capabilities
Function calling
Connect to external tools, APIs, and systems.
Structured output
Return responses in structured formats like JSON.
Web search
Search the web for up-to-date information.
Code execution
Write and execute code in a sandboxed environment.
File upload
Process uploaded documents, spreadsheets, and other files.
MCP
Connect to services via Model Context Protocol.
Image generation
Generate and edit images from text prompts.
More from OpenAI
| Model | Context | Input / 1M | Output / 1M |
|---|---|---|---|
|
GPT-5
|
400K | $1.25 | $10.00 |
|
o3-mini
|
200K | $1.10 | $4.40 |
|
o4-mini
|
200K | $1.00 | $4.00 |
|
GPT-5.2
|
400K | $1.75 | $14.00 |
|
GPT-5.3-Codex
|
400K | $1.75 | $14.00 |
|
GPT-5.6 Terra
|
1M | $2.00 | $12.00 |
|
GPT-4.1
|
1M | $2.00 | $8.00 |
|
o3
|
200K | $2.00 | $8.00 |
Models near this price
The models nearest this one by input rate, five each way, at each one's cheapest listed provider.
Frequently Asked Questions
How much does GPT-5.1 cost?
GPT-5.1 costs $1.25 per 1M input tokens and $10.00 per 1M output tokens via OpenAI; all 2 providers listing it charge the same rate.
What does GPT-5.1 cost for 10M input and 2M output tokens?
At OpenAI's rates, 10M input tokens and 2M output tokens cost about $32.50: $12.50 for input and $20.00 for output. Input is prompts and context, output is what the model writes back; a workload that generates more than it reads shifts the cost toward the output rate of $10.00 per 1M tokens.
Which providers offer GPT-5.1?
2 providers list GPT-5.1: OpenAI ($1.25 in / $10.00 out) and Azure ($1.25 in / $10.00 out). Rates are per 1M tokens in USD, cheapest input rate first.
What is GPT-5.1's context window?
GPT-5.1 accepts up to 400K tokens of input per request and returns up to 128K tokens per response. The context window is the prompt plus any documents, conversation history and tool results sent with it; every token in it is billed at the input rate.
What is GPT-5.1's knowledge cutoff?
GPT-5.1's knowledge cutoff is September 2024: its training data runs up to that month and it has no built-in knowledge of later events. It supports web search, which can supply newer information at query time.
What inputs and outputs does GPT-5.1 support?
GPT-5.1 accepts text and images as input and produces text. Its listed capabilities are function calling, structured output, web search, code execution, file upload, MCP and image generation.
How does GPT-5.1 compare with GPT-5?
GPT-5.1 and GPT-5 both cost $1.25 per 1M input tokens ($10.00 vs $10.00 per 1M output tokens). Both have a 400K-token context window.
What are cheaper alternatives to GPT-5.1?
Models from other creators with a lower input rate and at least GPT-5.1's 400K-token context window: Qwen3-Coder-Plus at $1.00 per 1M input tokens (1M context), GLM-5.2 at $0.90 per 1M input tokens (1M context) and Nemotron 3 Ultra 550B A55B at $0.60 per 1M input tokens (1M context). Rates are the cheapest listed provider for each; whether the quality holds for a given task is a separate question.
Cheaper alternatives to GPT-5.1
Qwen3-Coder-Plus
$1.00 per 1M input tokens and $5.00 per 1M output tokens via Alibaba Cloud, 1M-token context, by Alibaba Cloud.
GLM-5.2
$0.90 per 1M input tokens and $2.80 per 1M output tokens via Geodd, 1M-token context, by Z.AI.
Nemotron 3 Ultra 550B A55B
$0.60 per 1M input tokens and $3.60 per 1M output tokens via Together, 1M-token context, by Nvidia.