GPT-5 nano vs GPT-5.1: Pricing Comparison
Compare pricing, capabilities, and costs for your LLM workloads.
OpenAI
GPT-5 nano
Pricing (per 1M tokens)
Input$0.0500
Output$0.4000
Cached Input$0.005000
Batch Input$0.0250
Batch Output$0.2000
Context & Output
Context Window400K tokens
Max Output128K tokens
Capabilities
Categorybudget
Multimodaltext
Fine-tuningNo
StreamingYes
OpenAI
GPT-5.1
Pricing (per 1M tokens)
Input$1.25
Output$10.00
Cached Input$0.1250
Context & Output
Context Window400K tokens
Max Output128K tokens
Capabilities
Categoryflagship
Multimodaltext + image
Fine-tuningNo
StreamingYes
Quick Verdict
Cheaper Input Price
GPT-5 nano
96.0% cheaper
Cheaper Output Price
GPT-5 nano
96.0% cheaper
Larger Context Window
GPT-5.1
+0 tokens
Cost Comparison
Sample workload: 1,000,000 input tokens + 1,000,000 output tokens
GPT-5 nano
$0.4500
$0.0500/1M input + $0.4000/1M output
GPT-5.1
$11.25
$1.25/1M input + $10.00/1M output
GPT-5 nano is 96.0% cheaper for this workload.
Frequently Asked Questions
Which is cheaper, GPT-5 nano or GPT-5.1?
For input tokens, GPT-5 nano is cheaper at $0.0500 per 1M tokens. For output tokens, GPT-5 nano is cheaper at $0.4000 per 1M tokens. The overall cost depends on your workload's input/output ratio.
What is the context window size of GPT-5 nano vs GPT-5.1?
GPT-5 nano has a context window of 400K tokens, while GPT-5.1 has 400K tokens. GPT-5 nano supports a larger context window of 400K tokens, which is beneficial for processing longer documents.
Need more tools?
Explore our complete suite of LLM calculators and comparison tools.