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Cloudflare's Clef cloned Jev's LLM-based multiple-choice solver in two weeks and beat it 4x on speed with 2x better accuracy using a smarter inference approach. The post argues this shows how hard it is to build defensible software products without proprietary data.
- Clef uses a frozen Qwen model with parallel schema scoring instead of generating text, achieving 4x faster performance and 2x accuracy improvements over Jev on some benchmarks
- Open-sourcing Clef immediately eliminated any competitive advantage Jev had from being first to market
- Without proprietary data or a clear technical moat, launching novel LLM applications offers almost no protection against rapid cloning by better-resourced competitors