GPT-5.1 vs GPT-5.4 Pro: Pricing Comparison
Compare pricing, capabilities, and costs for your LLM workloads.
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
OpenAI
GPT-5.4 Pro
Pricing (per 1M tokens)
Input$30.00
Output$180.00
Context & Output
Context Window1.1M tokens
Max Output128K tokens
Capabilities
Categoryflagship
Multimodaltext + image
Fine-tuningNo
StreamingYes
Quick Verdict
Cheaper Input Price
GPT-5.1
95.8% cheaper
Cheaper Output Price
GPT-5.1
94.4% cheaper
Larger Context Window
GPT-5.4 Pro
+650K tokens
Cost Comparison
Sample workload: 1,000,000 input tokens + 1,000,000 output tokens
GPT-5.1
$11.25
$1.25/1M input + $10.00/1M output
GPT-5.4 Pro
$210.00
$30.00/1M input + $180.00/1M output
GPT-5.1 is 94.6% cheaper for this workload.
Frequently Asked Questions
Which is cheaper, GPT-5.1 or GPT-5.4 Pro?
For input tokens, GPT-5.1 is cheaper at $1.25 per 1M tokens. For output tokens, GPT-5.1 is cheaper at $10.00 per 1M tokens. The overall cost depends on your workload's input/output ratio.
What is the context window size of GPT-5.1 vs GPT-5.4 Pro?
GPT-5.1 has a context window of 400K tokens, while GPT-5.4 Pro has 1.1M tokens. GPT-5.4 Pro supports a larger context window of 1.1M tokens, which is beneficial for processing longer documents.
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