DeepSeek V4.1 Flash vs Claude Fable 5.1
A direct, empirical evaluation of DeepSeek V4.1 Flash (DeepSeek-AI) against Claude Fable 5.1 (Anthropic).
DeepSeek V4.1 Flash
Developed by DeepSeek-AI · 240B parameters
Real-time production inference, high-concurrency coding agents, sub-220ms time-to-first-token, and cost-optimized long-context parsing.
Claude Fable 5.1
Developed by Anthropic · Proprietary Frontier parameters
Full-repository software refactoring, agentic tool workflows, formal verification, and 1.5M-token needle retrieval.