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Claude Sonnet 4.5 vs Kimi K2 Thinking
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 3.3% higher average benchmark score. Kimi K2 Thinking offers 192 more tokens in context window than Claude Sonnet 4.5. Kimi K2 Thinking is $13.00 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. Claude Sonnet 4.5 is available on 3 providers. Both models have their strengths depending on your specific coding needs.
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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 Thinking, released by Moonshot AI on November 6, 2025, is a reasoning-focused variant of Kimi K2 with 1 trillion total parameters and 32 billion active parameters, featuring extended chain-of-thought processing for complex problem solving. It builds on K2's agentic coding strengths with additional capabilities for mathematical and scientific reasoning. Kimi K2 Thinking targets open-source deployments requiring deep, deliberate reasoning across coding and analytical domains.
1 month newer
Claude Sonnet 4.5
Anthropic
2025-09-29
Kimi K2 Thinking
Moonshot AI
2025-11-06
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 Thinking
Input:$1.00
Output:$4.00($13.00 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Sonnet 4.5
Average Score:47.1%(+3.3%)
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Kimi K2 Thinking
Average Score:43.8%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Coding47.1%(+3.3%)
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Kimi K2 Thinking
Coding43.8%
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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 Thinking
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Claude Sonnet 4.5
Avg Score:47.1%(+3.3%)
Providers:3
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Kimi K2 Thinking
Avg Score:43.8%
Providers:1