GPT-4o mini vs GPT-5.1: Pricing Comparison
Compare pricing, capabilities, and costs for your LLM workloads.
OpenAI
GPT-4o mini
Pricing (per 1M tokens)
Input$0.1500
Output$0.6000
Cached Input$0.0750
Batch Input$0.0750
Batch Output$0.3000
Context & Output
Context Window128K tokens
Max Output16.4K tokens
Capabilities
Categorybudget
Multimodaltext + image
Fine-tuningYes
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-4o mini
88.0% cheaper
Cheaper Output Price
GPT-4o mini
94.0% cheaper
Larger Context Window
GPT-5.1
+272K tokens
Cost Comparison
Sample workload: 1,000,000 input tokens + 1,000,000 output tokens
GPT-4o mini
$0.7500
$0.1500/1M input + $0.6000/1M output
GPT-5.1
$11.25
$1.25/1M input + $10.00/1M output
GPT-4o mini is 93.3% cheaper for this workload.
Frequently Asked Questions
Which is cheaper, GPT-4o mini or GPT-5.1?
For input tokens, GPT-4o mini is cheaper at $0.1500 per 1M tokens. For output tokens, GPT-4o mini is cheaper at $0.6000 per 1M tokens. The overall cost depends on your workload's input/output ratio.
What is the context window size of GPT-4o mini vs GPT-5.1?
GPT-4o mini has a context window of 128K tokens, while GPT-5.1 has 400K tokens. GPT-5.1 supports a larger context window of 400K tokens, which is beneficial for processing longer documents.
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