Gemini 3 Flash vs GPT-5.1: Pricing Comparison
Compare pricing, capabilities, and costs for your LLM workloads.
Gemini 3 Flash
Pricing (per 1M tokens)
Input$0.5000
Output$3.00
Cached Input$0.0500
Batch Input$0.2500
Batch Output$1.50
Context & Output
Context Window1M tokens
Max Output65.5K tokens
Capabilities
Categorymid
Multimodaltext + image + audio
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
Gemini 3 Flash
60.0% cheaper
Cheaper Output Price
Gemini 3 Flash
70.0% cheaper
Larger Context Window
Gemini 3 Flash
+600K tokens
Cost Comparison
Sample workload: 1,000,000 input tokens + 1,000,000 output tokens
Gemini 3 Flash
$3.50
$0.5000/1M input + $3.00/1M output
GPT-5.1
$11.25
$1.25/1M input + $10.00/1M output
Gemini 3 Flash is 68.9% cheaper for this workload.
Frequently Asked Questions
Which is cheaper, Gemini 3 Flash or GPT-5.1?
For input tokens, Gemini 3 Flash is cheaper at $0.5000 per 1M tokens. For output tokens, Gemini 3 Flash is cheaper at $3.00 per 1M tokens. The overall cost depends on your workload's input/output ratio.
What is the context window size of Gemini 3 Flash vs GPT-5.1?
Gemini 3 Flash has a context window of 1M tokens, while GPT-5.1 has 400K tokens. Gemini 3 Flash supports a larger context window of 1M tokens, which is beneficial for processing longer documents.
Need more tools?
Explore our complete suite of LLM calculators and comparison tools.