Kimi K3 vs o3
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Kimi K3 by Moonshot AI wins on 5 of 7 benchmarks against o3 by OpenAI, which leads on 2. 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 K3 scores 1377 on Design Arena ELO compared to o3's 1074, while Kimi K3 scores 1352 on Website Arena ELO compared to o3's 1048.
Reasoning: In reasoning, Kimi K3 scores 91.5% on GPQA Diamond compared to o3's 83.3%.
Context: In context, Kimi K3 scores 1.0M on Context Length compared to o3's 200K.
Pricing Comparison
Kimi K3 costs $2.6/1M input tokens and $13.3/1M output tokens, while o3 costs $2.0/1M input and $8.0/1M output. o3 is the more affordable option for API usage.
Verdict
o3 leads across the board in affordability, making it the stronger overall choice in this comparison.
View Individual Model Pages
Kimi K3 vs o3 — FAQ
Which is better, Kimi K3 or o3?
Kimi K3 wins on more benchmarks overall (5 vs 2). However, the best choice depends on your specific needs — each model excels in different areas.
How does Kimi K3 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 K3 cheaper than o3?
Yes, o3 is cheaper. Kimi K3 costs $2.6/1M input and $13.3/1M output tokens. o3 costs $2.0/1M input and $8.0/1M output tokens.
Which is faster, Kimi K3 or o3?
Output speed data is not available for both models. Check the speed section of the comparison above for available performance data.
What benchmarks does the Kimi K3 vs o3 comparison cover?
This comparison covers 7 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, Cached Input Cost, Design Arena ELO, Website Arena ELO. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.