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LLM Model Comparison
Compare LLM model specifications and capabilities side by side
grok-4-fast
xAI
gpt-4o:extended
OpenAIModalities
Modalities
Specifications
Specifications
Context Length
2,000,000
Context Length
128,000
Max Output Tokens
30,000
Max Output Tokens
64,000
Release Date
9/19/2025
Release Date
5/13/2024
Pricing
Pricing
Input Price ($/M tokens)
96.7% cheaper
$0.20
Input Price ($/M tokens)
$6.00
Output Price ($/M tokens)
97.2% cheaper
$0.50
Output Price ($/M tokens)
$18.00
Capabilities
Capabilities
Reasoning
Reasoning
Tool Calling
Tool Calling
Structured Outputs
Structured Outputs
Web Search
Web Search