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    Cloudflare Clef logo
    AI Agent
    Freemium
    Free Trial
    Sponsored

    Cloudflare Clef

    AI Agent

    Cloudflare Clef and Clef-flash are open-source (Apache 2.0) System One decision models on Workers AI: multimodal state plus typed noul/choice/score questions return probabilities, with a Jev-compatible API shape and optional fine-tuning path.

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    Alternatives & similar tools

    Related picks from editorial notes.

    Also mentioned

    • Jev (TypeSafe System One)
    • Laya (hosted open decision API
    • Jev-compatible)
    • Self-host Clef / Clef-flash weights from Hugging Face
    • LLM structured outputs on Workers AI or other providers

    Features & details

    Full overview from our catalog (read-only reference).

    Category (short)
    AI Agent
    Category
    AI Agent
    Pricing (CSV)
    Free Trial
    Directory pricing
    Freemium
    Sponsored note
    no
    Target audience
    Developers & engineers
    Best for
    Cloudflare-native stacks that need fast structured decisions with Workers AI billing and open-source weights. Not ideal for: pure TypeSafe SDK shops that only want first-party Jev, or buyers who refuse any Cloudflare account.
    Pricing notes
    Verified October 2026 at https://developers.cloudflare.com/workers-ai/platform/pricing/ (updated Oct 1, 2026). @cf/cloudflare/clef: $0.240 per M input tokens (21818 neurons/M). @cf/cloudflare/clef-flash: $0.090 per M input tokens (8182 neurons/M). Workers AI bills via neurons ($0.011 per 1,000 Neurons) with 10,000 Neurons/day free allocation on Free and Paid; usage above free tier needs Workers Paid. Launch blog Oct 1, 2026: https://blog.cloudflare.com/clef-decision-models/.

    Pros & cons

    Editorial notes to help compare fit before opening the vendor site.

    Pros

    • Open weights (Apache 2.0) plus managed Workers AI hosting
    • Vision / multimodal state unlike text-only Jev
    • Clef-flash for latency-critical paths
    • Clef for precision
    • Fits existing Cloudflare Workers / AI Gateway setups

    Cons

    • Requires Cloudflare account and Workers AI (neurons) billing literacy
    • Newer first-party CF model line
    • fine-tuning platform still maturing
    • Benchmark wins are vendor-published
    • validate on your labels
    • Heavier Clef list price per M input than Jev/Laya text APIs

    Review notes

    Context from the listing review and editorial research.

    NEW tool. Directory name Cloudflare Clef covers the Clef + Clef-flash family on Workers AI. DISAMBIGUATION: not music notation software; not TypeSafe Jev (compatible API, different vendor/model); Cloudflare positions Clef as competitive with Jev on the Jev Decision Index with much lower median latency on their benches. Open-source weights + hosted inference. Related: Cloudflare RL fine-tuning product for domain-specific Clef variants.

    Extended features

    In-depth description and capability notes.

    Models @cf/cloudflare/clef and @cf/cloudflare/clef-flash on Workers AI System One API: state + up to 64 typed questions (noul, choice, score) Multimodal inputs: text/JSON plus optional embedded images (Clef vision) ~64k context window (per Cloudflare launch materials) REST (/ai/run) and Workers AI binding (env.AI.run) Open weights on Hugging Face under Apache 2.0 AI Gateway compatible; enterprise note that Cloudflare does not train on your requests by default Fine-tuning / RL path announced (FDE first, self-serve later)

    Use cases

    Teams already on Cloudflare Workers use Clef in the hot path for routing, moderation, triage, and agent guardrails where they want edge hosting, open weights, or vision alongside typed decisions.