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Claude Sonnet 4.5 vs Kimi K2.5

Head to head on 28 shared benchmarks, with price, context window, and release dates.

Benchmark scores

91

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Model
Kimi K2.5

Moonshot AI

96.168.3%1576elo74.927.9%78.9%13.2%43.7%78.5%72.5%77.9%61.4%57.4%77.7%84.9%76.0%39.3%76.4%66.5%63.3%49.9%39.6%67.3%70.8%74.2%18.9%17.5%81.3%----------39.0%----35.8%--------95.4-10421------62.0%--87.1---------------73-----69.4-26.3%--56.8%
Claude Sonnet 4.5

Anthropic

10060.8%1675elo71.415.2%72.7%7.2%42.7%83.8%70.7%80.4%57.0%53.4%76.5%79.3%77.6%40.6%84.5%64.0%62.9%32.9%42.8%67.0%74.8%73.3%28.8%22.6%70.5%0.0%0.0%37.0%0.0%0.0%0.0%5.0%0.0%0.0%0.0%-0.0%0.0%0.0%0.0%-0.0%0.0%83.9%0.0%0.0%0.0%0.0%0.0%-87.5%-0.0%0.0%59.0%0.750.750.0%-00-86.0%0.0%0.0%0.0%0.0%19.0%0.0%0.0%0.0%0.0%0.0%0.0%00.0%0.0%-77.2%0.0%0050.34-0-0.0%1.4927.5%
2 / 2 models
AttributeClaude Sonnet 4.5

Anthropic

Kimi K2.5

Moonshot AI

Descriptionanthropic/claude-sonnet-4.5 is an AI model.Kimi K2.5 is an AI model from Kimi.
FamilyClaudeKimi
ParamsUndisclosed (closed)-
Open weightsclosedclosed
LicenseProprietaryModified MIT
Released29 Sep 202527 Jan 2026
Context1,000,000262,144
Input $/1M$3.00$0.60
Output $/1M$15.00$3.00
Cache read $/1M$0.300$0.100
Cache write $/1M$3.750-
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestext, image, filetext, image
Providersanthropic, aws-bedrock, vertex-ai-
PublisherAnthropicMoonshot AI
Reported scores
LiveBench - Math79.3% (LiveBench)
LiveBench - Coding80.4% (LiveBench)
LiveBench - Language76.5% (LiveBench)
LiveBench - Data Analysis57.0% (LiveBench)

FAQ

Is Claude Sonnet 4.5 or Kimi K2.5 better?
Across the 28 benchmarks both models report on Sophon, Kimi K2.5 leads on 17 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do Claude Sonnet 4.5 and Kimi K2.5 compare on GPQA Diamond?
Claude Sonnet 4.5 scores 72.7% and Kimi K2.5 scores 78.9% on GPQA Diamond.
Which is cheaper, Claude Sonnet 4.5 or Kimi K2.5?
Kimi K2.5 is cheaper at $3.00 per million output tokens against $15.00 for Claude Sonnet 4.5 - about 5.0x.
When were Claude Sonnet 4.5 and Kimi K2.5 released?
Claude Sonnet 4.5 was released 29 Sep 2025 by Anthropic. Kimi K2.5 was released 27 Jan 2026 by Moonshot AI.

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