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Claude Sonnet 4.5 vs Kimi K2
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 20.1% higher average benchmark score. Kimi K2 offers 192 more tokens in context window than Claude Sonnet 4.5. Kimi K2 is $14.90 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. Claude Sonnet 4.5 is available on 3 providers. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5, released by Anthropic in September 2025, is a large language model from the Claude 4.5 family that balances response quality and efficiency for coding, agentic tasks, and analytical work. It features a 200K token context window (extendable to 1M tokens in beta), 64K maximum output tokens, native image understanding, and extended thinking support. Sonnet 4.5 targets use cases that require a balance of throughput and reasoning depth, including code generation, data analysis, and multi-step agentic pipelines.
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Moonshot AI
Kimi K2, released by Moonshot AI on July 11, 2025, is an open-weight Mixture-of-Experts large language model with 1 trillion total parameters and 32 billion active parameters per inference. It features a 256K token context window (expanded from 128K in an September 2025 update) and demonstrated strong performance on agentic coding benchmarks. Kimi K2 targets software engineering agents, tool-use workflows, and open-source deployments under a modified MIT license.
2 months newer
Kimi K2
Moonshot AI
2025-07-11
Claude Sonnet 4.5
Anthropic
2025-09-29
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
Input:$0.60
Output:$2.50($14.90 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Sonnet 4.5
Average Score:64.3%(+20.1%)
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Kimi K2
Average Score:44.1%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Agents84.7%(+20.4%)
Tool Use43.8%(+19.9%)
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Kimi K2
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.5
2025-01
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
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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Kimi K2
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Claude Sonnet 4.5
Avg Score:64.3%(+20.1%)
Providers:3
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Kimi K2
Avg Score:44.1%
Providers:1