o4 mini vs GPT-5.1: Pricing Comparison
Compare pricing, capabilities, and costs for your LLM workloads.
OpenAI
o4 mini
Pricing (per 1M tokens)
Input$1.10
Output$4.40
Cached Input$0.2750
Batch Input$0.5500
Batch Output$2.20
Context & Output
Context Window200K tokens
Max Output100K tokens
Capabilities
Categorymid
Multimodaltext + image
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
o4 mini
12.0% cheaper
Cheaper Output Price
o4 mini
56.0% cheaper
Larger Context Window
GPT-5.1
+200K tokens
Cost Comparison
Sample workload: 1,000,000 input tokens + 1,000,000 output tokens
o4 mini
$5.50
$1.10/1M input + $4.40/1M output
GPT-5.1
$11.25
$1.25/1M input + $10.00/1M output
o4 mini is 51.1% cheaper for this workload.
Frequently Asked Questions
Which is cheaper, o4 mini or GPT-5.1?
For input tokens, o4 mini is cheaper at $1.10 per 1M tokens. For output tokens, o4 mini is cheaper at $4.40 per 1M tokens. The overall cost depends on your workload's input/output ratio.
What is the context window size of o4 mini vs GPT-5.1?
o4 mini has a context window of 200K 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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