kimi-k2-0905-preview vs grok-4-fast-reasoning
Pricing, Performance & Features Comparison
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
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Input-
Output-
in$0.6out$2.5cache$0.15-
Success Rate (24h)
xAI latest advancement in cost-efficient reasoning models.
Input$0.2
Output$0.5
Latency (p50)2.3s
Output Limit-
Function Calling
JSON Mode
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Input-
Output-
in$0.2out$0.5-write$0.05