Claude Opus 4.5 vs Kimi K2 Thinking
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Claude Opus 4.5 by Anthropic and Kimi K2 Thinking by Vertex are evenly matched across 8 benchmarks. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
Coding: In coding, Claude Opus 4.5 scores 1242 on Design Arena ELO compared to Kimi K2 Thinking's 1125, while Claude Opus 4.5 scores 1259 on Website Arena ELO compared to Kimi K2 Thinking's 1125.
Reasoning: In reasoning, Claude Opus 4.5 scores 86.5% on GPQA Diamond compared to Kimi K2 Thinking's 83.4%, while Claude Opus 4.5 scores 77.0% on τ²-Bench Airline compared to Kimi K2 Thinking's 69.2%.
Context: In context, Kimi K2 Thinking scores 262K on Context Length compared to Claude Opus 4.5's 200K.
Pricing Comparison
Claude Opus 4.5 costs $5.0/1M input tokens and $25.0/1M output tokens, while Kimi K2 Thinking costs $0.60/1M input and $2.5/1M output. Kimi K2 Thinking is the more affordable option for API usage.
Verdict
Kimi K2 Thinking leads across the board in affordability, making it the stronger overall choice in this comparison.
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Claude Opus 4.5 vs Kimi K2 Thinking — FAQ
Which is better, Claude Opus 4.5 or Kimi K2 Thinking?
Claude Opus 4.5 and Kimi K2 Thinking are evenly matched across benchmarks. The best choice depends on your specific priorities such as coding ability, speed, or pricing.
How does Claude Opus 4.5 compare to Kimi K2 Thinking for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is Claude Opus 4.5 cheaper than Kimi K2 Thinking?
Yes, Kimi K2 Thinking is cheaper. Claude Opus 4.5 costs $5.0/1M input and $25.0/1M output tokens. Kimi K2 Thinking costs $0.60/1M input and $2.5/1M output tokens.
Which is faster, Claude Opus 4.5 or Kimi K2 Thinking?
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 Claude Opus 4.5 vs Kimi K2 Thinking comparison cover?
This comparison covers 8 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, Cached Input Cost, Design Arena ELO, τ²-Bench Airline, Website Arena ELO. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.