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Claude Sonnet 4.5 vs Kimi K2 Instruct
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 17.9% higher average benchmark score. Claude Sonnet 4.5 offers 1.9K more tokens in context window than Kimi K2 Instruct. Kimi K2 Instruct is $15.13 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 Instruct was developed as the instruction-tuned version of Kimi K2, designed to follow user instructions reliably across diverse tasks. Built to serve general-purpose conversational and task-completion applications, it provides Moonshot's accessible interface for language AI.
2 months newer
Kimi K2 Instruct
Moonshot AI
2025-07-11
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 Instruct
Input:$0.57
Output:$2.30($15.13 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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Claude Sonnet 4.5
Average Score:74.4%(+17.9%)
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Kimi K2 Instruct
Average Score:56.5%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Coding77.2%(+5.6%)
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Kimi K2 Instruct
Coding71.6%
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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:74.4%(+17.9%)
Providers:2
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Kimi K2 Instruct
Avg Score:56.5%
Providers:1