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Claude Sonnet 4.5 vs Kimi K2 0905
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 7.6% higher average benchmark score. Kimi K2 0905 offers 260.3K more tokens in context window than Claude Sonnet 4.5. Kimi K2 0905 is $14.90 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5 was developed to bridge human thinking and machine assistance, allowing people to work with language and tools in a more conversational and natural way. Built with a focus on turning ideas into results, it represents an evolution in making AI feel less mechanical while maintaining strong capabilities across reasoning, coding, and collaborative tasks.
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Moonshot AI
Kimi K2 was introduced as the second generation of Moonshot's language model family, designed to provide enhanced capabilities across language understanding and generation. Built with architectural improvements and expanded training, it represents a significant advancement in Moonshot's model offerings.
24 days newer
Kimi K2 0905
Moonshot AI
2025-09-05
Claude Sonnet 4.5
Anthropic
2025-09-29
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Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00
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Kimi K2 0905
Input:$0.60
Output:$2.50($14.90 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Sonnet 4.5
Average Score:83.4%(+7.6%)
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Kimi K2 0905
Average Score:75.8%
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.5
2025-01-31
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Claude Sonnet 4.5
2 providers
Anthropic
Throughput: 42 tok/s
Latency: 0.4ms
ZeroEval
Throughput: 42 tok/s
Latency: 0.4ms
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Claude Sonnet 4.5
Avg Score:83.4%(+7.6%)
Providers:2
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Kimi K2 0905
Avg Score:75.8%
Providers:2