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kimi-k2-0905-preview vs grok-4-fast-non-reasoning

Pricing, Performance & Features Comparison

Price unit:

kimi-k2-0905-preview

Authormoonshot

Context Length256K

Reasoning

-

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)1.9s

Output Limit-

Function Calling

JSON Mode

-

Input-

Output-

in$0.6out$2.5cache$0.15-

Latency (24h)

Success Rate (24h)

grok-4-fast-non-reasoning

Authorxai

Context Length2M

Reasoning

-

Providers1

ReleasedSep 2025

Knowledge Cutoff-

License-

xAI latest advancement in cost-efficient reasoning models.

Input$0.2

Output$0.5

Latency (p50)1s

Output Limit-

Function Calling

JSON Mode

-

Input-

Output-

in$0.2out$0.5-write$0.05

Latency (24h)

Success Rate (24h)