Cloudflare's Clef is built on Qwen3.8-27B with 27 billion parameters, while Clef-flash is built on Qwen3.5-9B with 9 billion parameters

Large language models (LLMs) are advanced AI systems trained on massive text datasets to understand, generate, and reason about human language, powering applications such as chatbots, code generation, summarization, and scientific discovery.