Anthropic's Sonnet-class model for well-scoped everyday work, a direct upgrade over Claude Sonnet 5.
Large hybrid reasoning model supporting thinking and non-thinking modes.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Claude Sonnet 5.5 and DeepSeek V3.1 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 V3.1 has a lower blended cost. Claude Sonnet 5.5: $2.00 input / $10.00 output. DeepSeek V3.1: $0.25 input / $0.95 output.
Claude Sonnet 5.5 has a larger context window: Claude Sonnet 5.5 supports 1M tokens vs DeepSeek V3.1 at 164K tokens.
Claude Sonnet 5.5 supports vision/image input, but DeepSeek V3.1 does not.
Key differences: DeepSeek V3.1 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 V3.1 for free on idapt.app to see which performs better for your specific needs.