Anthropic's upgraded Mythos-class flagship, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work.
Open-source reasoning model matching OpenAI o1 performance.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Claude Fable 5.1 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 Fable 5.1: $10.00 input / $50.00 output. DeepSeek R1: $0.70 input / $2.50 output.
Claude Fable 5.1 has a larger context window: Claude Fable 5.1 supports 1M tokens vs DeepSeek R1 at 64K tokens.
Claude Fable 5.1 supports vision/image input, but DeepSeek R1 does not.
Key differences: DeepSeek R1 is significantly cheaper; only Claude Fable 5.1 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 Fable 5.1 and DeepSeek R1 for free on idapt.app to see which performs better for your specific needs.