Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 7.6% higher average benchmark score. Kimi K2 0905 offers 260.3K more tokens in context window than Claude Sonnet 4.5. Kimi K2 0905 is $14.90 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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.
Moonshot AI
Kimi K2 was introduced as the second generation of Moonshot's language model family, designed to provide enhanced capabilities across language understanding and generation. Built with architectural improvements and expanded training, it represents a significant advancement in Moonshot's model offerings.
24 days newer

Kimi K2 0905
Moonshot AI
2025-09-05

Claude Sonnet 4.5
Anthropic
2025-09-29
Cost per million tokens (USD)

Claude Sonnet 4.5

Kimi K2 0905
Context window and performance specifications
Average performance across 1 common benchmarks

Claude Sonnet 4.5

Kimi K2 0905
Claude Sonnet 4.5
2025-01-31
Available providers and their performance metrics

Claude Sonnet 4.5
Anthropic
ZeroEval


Claude Sonnet 4.5

Kimi K2 0905

Claude Sonnet 4.5

Kimi K2 0905
Kimi K2 0905
Novita
ZeroEval