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Claude Opus 4.5 vs Kimi K2
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 38.4% higher average benchmark score. Kimi K2 offers 192 more tokens in context window than Claude Opus 4.5. Kimi K2 is $26.90 cheaper per million tokens. Claude Opus 4.5 supports multimodal inputs. Claude Opus 4.5 is available on 3 providers. Overall, Claude Opus 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Opus 4.5, released by Anthropic in November 2025, is a large language model from the Claude 4.5 family built for demanding reasoning tasks, advanced code generation, and complex agentic workflows. It features a 200K token context window, 64K maximum output tokens, native image understanding, and extended thinking with configurable effort levels. Opus 4.5 targets deep analytical work, multi-step tool orchestration, and applications requiring sustained reasoning across long, complex tasks.
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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.
3 months newer
Kimi K2
Moonshot AI
2025-07-11
Claude Opus 4.5
Anthropic
2025-11-01
Pricing Comparison
Cost per million tokens (USD)
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Claude Opus 4.5
Input:$5.00
Output:$25.00
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Kimi K2
Input:$0.60
Output:$2.50($26.90 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Opus 4.5
Average Score:62.3%(+38.4%)
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Kimi K2
Average Score:23.9%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Tool Use62.3%(+38.4%)
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Kimi K2
Tool Use23.9%
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Knowledge Cutoff
Training data recency comparison
Claude Opus 4.5
2025-05
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 Opus 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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Kimi K2
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Claude Opus 4.5
Avg Score:62.3%(+38.4%)
Providers:3
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Kimi K2
Avg Score:23.9%
Providers:1