Kimi K2.5 vs o3
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Kimi K2.5 by Moonshot AI wins on 8 of 9 benchmarks against o3 by OpenAI, which leads on 1. 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 o3's 1074, while Kimi K2.5 scores 1261 on Website Arena ELO compared to o3's 1048.
Reasoning: In reasoning, Kimi K2.5 scores 84.9% on GPQA Diamond compared to o3's 83.3%.
Context: In context, Kimi K2.5 scores 262K on Context Length compared to o3's 200K.
Pricing Comparison
Kimi K2.5 costs $0.45/1M input tokens and $2.3/1M output tokens, while o3 costs $2.0/1M input and $8.0/1M output. Kimi K2.5 is the more affordable option for API usage.
Speed Comparison
Kimi K2.5 generates output at 45 tok/s compared to o3's 40 tok/s, and the time to first token is 1210 ms for Kimi K2.5 versus 800 ms for o3. Kimi K2.5 delivers faster throughput.
Verdict
Kimi K2.5 leads across the board in affordability, speed, making it the stronger overall choice in this comparison.
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Kimi K2.5 vs o3 — FAQ
Which is better, Kimi K2.5 or o3?
Kimi K2.5 wins on more benchmarks overall (8 vs 1). However, the best choice depends on your specific needs — each model excels in different areas.
How does Kimi K2.5 compare to o3 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is Kimi K2.5 cheaper than o3?
Yes, Kimi K2.5 is cheaper. Kimi K2.5 costs $0.45/1M input and $2.3/1M output tokens. o3 costs $2.0/1M input and $8.0/1M output tokens.
Which is faster, Kimi K2.5 or o3?
Kimi K2.5 is faster, generating output at 45 tok/s compared to 40 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Kimi K2.5 vs o3 comparison cover?
This comparison covers 9 benchmarks including GPQA Diamond, Output Speed, Time to First Token, Input Cost, Output Cost, Context Length, Cached Input Cost, Design Arena ELO, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.