Grok 4 vs Kimi K2.5
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Kimi K2.5 by Moonshot AI wins on 5 of 8 benchmarks against Grok 4 by xAI, which leads on 3. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
Coding: In coding, Kimi K2.5 scores 1228 on Design Arena ELO compared to Grok 4's 1073, while Kimi K2.5 scores 1261 on Website Arena ELO compared to Grok 4's 1056.
Reasoning: In reasoning, Grok 4 scores 87.0% on GPQA Diamond compared to Kimi K2.5's 84.9%.
Context: In context, Kimi K2.5 scores 262K on Context Length compared to Grok 4's 256K.
Pricing Comparison
Grok 4 costs $3.0/1M input tokens and $15.0/1M output tokens, while Kimi K2.5 costs $0.45/1M input and $2.3/1M output. Kimi K2.5 is the more affordable option for API usage.
Speed Comparison
Grok 4 generates output at 55 tok/s compared to Kimi K2.5's 45 tok/s, and the time to first token is 500 ms for Grok 4 versus 1210 ms for Kimi K2.5. Grok 4 delivers faster throughput.
Verdict
For developers prioritizing speed, Grok 4 has the edge. For those who value affordability, Kimi K2.5 is the stronger choice.
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Grok 4 vs Kimi K2.5 — FAQ
Which is better, Grok 4 or Kimi K2.5?
Kimi K2.5 wins on more benchmarks overall (5 vs 3). However, the best choice depends on your specific needs — each model excels in different areas.
How does Grok 4 compare to Kimi K2.5 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is Grok 4 cheaper than Kimi K2.5?
Yes, Kimi K2.5 is cheaper. Grok 4 costs $3.0/1M input and $15.0/1M output tokens. Kimi K2.5 costs $0.45/1M input and $2.3/1M output tokens.
Which is faster, Grok 4 or Kimi K2.5?
Grok 4 is faster, generating output at 55 tok/s compared to 45 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Grok 4 vs Kimi K2.5 comparison cover?
This comparison covers 8 benchmarks including GPQA Diamond, Output Speed, Time to First Token, Input Cost, Output Cost, Context Length, Design Arena ELO, Website Arena ELO. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.