Anthropic's Sonnet-class model for well-scoped everyday work, a direct upgrade over Claude Sonnet 5.
Open-source reasoning model matching OpenAI o1 performance.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Claude Sonnet 5.5 and DeepSeek R1 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.
DeepSeek R1 has a lower blended cost. Claude Sonnet 5.5: $2.00 input / $10.00 output. DeepSeek R1: $0.70 input / $2.50 output.
Claude Sonnet 5.5 has a larger context window: Claude Sonnet 5.5 supports 1M tokens vs DeepSeek R1 at 64K tokens.
Claude Sonnet 5.5 supports vision/image input, but DeepSeek R1 does not.
Key differences: DeepSeek R1 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 DeepSeek R1 for free on idapt.app to see which performs better for your specific needs.