GPT-5 vs Kimi K3
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Kimi K3 by Moonshot AI wins on 6 of 9 benchmarks against GPT-5 by OpenAI, 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 K3 scores 76.2 on AA Coding Index compared to GPT-5's 37.8, while Kimi K3 scores 1377 on Design Arena ELO compared to GPT-5's 1172, while Kimi K3 scores 1352 on Website Arena ELO compared to GPT-5's 1194.
Reasoning: In reasoning, Kimi K3 scores 91.5% on GPQA Diamond compared to GPT-5's 86.0%, while Kimi K3 scores 70.9% on τ²-Bench Airline compared to GPT-5's 68.4%.
Context: In context, Kimi K3 scores 1.0M on Context Length compared to GPT-5's 400K.
Pricing Comparison
GPT-5 costs $1.3/1M input tokens and $10.0/1M output tokens, while Kimi K3 costs $2.6/1M input and $13.3/1M output. GPT-5 is the more affordable option for API usage.
Verdict
GPT-5 leads across the board in affordability, making it the stronger overall choice in this comparison.
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GPT-5 vs Kimi K3 — FAQ
Which is better, GPT-5 or Kimi K3?
Kimi K3 wins on more benchmarks overall (6 vs 3). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-5 compare to Kimi K3 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is GPT-5 cheaper than Kimi K3?
Yes, GPT-5 is cheaper. GPT-5 costs $1.3/1M input and $10.0/1M output tokens. Kimi K3 costs $2.6/1M input and $13.3/1M output tokens.
Which is faster, GPT-5 or Kimi K3?
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 GPT-5 vs Kimi K3 comparison cover?
This comparison covers 9 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, AA Coding Index, Cached Input Cost, Design Arena ELO, τ²-Bench Airline, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.