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Claude Sonnet 4.5 vs Kimi K2.5
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 1.8% higher average benchmark score. Kimi K2.5 offers 192 more tokens in context window than Claude Sonnet 4.5. Kimi K2.5 is $10.50 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 K2.5, released by Moonshot AI in January 2026, is an updated Mixture-of-Experts large language model with 1 trillion total parameters and 32 billion active parameters. It builds on Kimi K2 with improved coding performance across multiple languages and an expanded context window. Kimi K2.5 targets agentic development workflows, polyglot code generation, and open-source deployments requiring large-scale MoE reasoning.
3 months newer
Claude Sonnet 4.5
Anthropic
2025-09-29
Kimi K2.5
Moonshot AI
2026-01
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 K2.5
Input:$1.50
Output:$6.00($10.50 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 5 common benchmarks
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Claude Sonnet 4.5
Average Score:50.9%(+1.8%)
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Kimi K2.5
Average Score:49.1%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Agents61.4%
Coding58.4%(+5.8%)
Reasoning17.7%
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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 K2.5
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Claude Sonnet 4.5
Avg Score:50.9%(+1.8%)
Providers:3
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Kimi K2.5
Avg Score:49.1%
Providers:1