Anthropic's Sonnet-class model for well-scoped everyday work, a direct upgrade over Claude Sonnet 5.
Kimi K2 with always-on extended reasoning for complex problem solving.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Claude Sonnet 5.5 and Kimi K2 Thinking are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.
Kimi K2 Thinking has a lower blended cost. Claude Sonnet 5.5: $2.00 input / $10.00 output. Kimi K2 Thinking: $0.60 input / $2.50 output.
Claude Sonnet 5.5 has a larger context window: Claude Sonnet 5.5 supports 1M tokens vs Kimi K2 Thinking at 262K tokens.
Claude Sonnet 5.5 supports vision/image input, but Kimi K2 Thinking does not.
Key differences: Kimi K2 Thinking is significantly cheaper; only Claude Sonnet 5.5 supports vision input. Compare full specs on this page.
If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Claude Sonnet 5.5 and Kimi K2 Thinking for free on idapt.app to see which performs better for your specific needs.