grok-4-fast-reasoning vs kimi-k2-0905-preview
Pricing, Performance & Features Comparison
xAI latest advancement in cost-efficient reasoning models.
Input$0.2
Output$0.5
Latency (p50)3.5s
Output Limit–
Function Calling
JSON Mode
-
Input–
Output–
in$0.2out$0.5–write$0.05
Latency (24h)
Success Rate (24h)
Context Length256K
Reasoning
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Providers1
ReleasedSep 2025
Knowledge CutoffFeb 2023
License–
Kimi K2 is our latest Mixture-of-Experts model with 32 billion activated parameters and 1 trillion total parameters.
Input$0.6
Output$2.5
Latency (p50)–
Output Limit–
Function Calling
JSON Mode
-
Input–
Output–
in$0.6out$2.5cache$0.15–