Model tracker / Decision models / Cloudflare
Clef
Clef is an open-weight decision model from Cloudflare (Apache 2.0, 27B parameters): it answers typed questions, such as yes or no, pick one or pick several, with probabilities instead of writing text. It costs $0.24 per million input tokens (Cloudflare Workers AI, OpenRouter), and output is free. It scores 75.3 (self-hosted weights; seconds are the board's estimate; not capability-ranked, as its cost is above the board's cap) on the independent JevBench Capability Score (board v1.7.46), where Jev, the reference, scores 77.1.
- Made by
- Cloudflare
- Weights
- Open, Apache 2.0
- Size
- 27B
- Where
- Cloudflare Workers AI, OpenRouter
- Images
- Yes
- Context
- 65,536
- Fine-tuning
- Hands-on RL fine-tuning service
Clef price
US dollars per million input tokens. Decision models don't write text, so none of the hosted ones charge for output.
| Where | Input | Output | Notes | Checked |
|---|---|---|---|---|
| Cloudflare Workers AI, OpenRouter | $0.24 | Free | Output is free. Workers AI's free daily allowance covers about 460,000 Clef tokens. | 2026-10-14 |
Clef benchmarks
| Benchmark | Result | What it measures | Reported by |
|---|---|---|---|
| JevBench v1.7.46 | 75.3 | Capability Score: accuracy and calibration on typed decisions, with Jev as the reference system | Independent |
| JevBench time | 0.58 s | Seconds per decision: measured end to end for hosted APIs, the board's estimate for self-hosted models | Independent |
| Reported speed | 152 ms median at about 800 input tokens, partly from a move to SGLang serving | Latency on the maker's own hardware | Cloudflare |
Makers' speeds are measured on their own hardware and aren't comparable with each other or with JevBench's timings.
Decision models like Clef
Every other decision model we track, by independent JevBench score.
| Model | Input / M | JevBench | Weights |
|---|---|---|---|
| Clef | $0.24 | 75.3 | Open |
| Jev 1.13 TypeSafe AI | $0.042 | 77.1 | Closed |
| d1 Liquid AI | $0.04 | 74.4 | Closed |
| OpenAI Decisions (GPT-6 Luna) OpenAI | $0.10 | 73.5 | Closed |
| Microsoft-Decision-1 Microsoft | $0.042 | 70.8 | Closed |
| Clef-flash Cloudflare | $0.038 | 63.8 | Open |
| Clef-omni Cloudflare | $0.15 | 58.3 | Open |
| d1-3B Liquid AI | Self-host | 49.5 | Open |
| d1-omni-600M (experimental) Liquid AI | Self-host | 32.8 | Open |
| Laya Convai Innovations | Free | 32.5 | Open |
| CLM-8B Stanford and NVIDIA | Self-host | 20.1 | Open |
| Strands Decider 2B AWS Strands Labs | Self-host | – | Open |
Compare them all in the decision models table →
Clef on dbggr
- Microsoft enters decision models at Jev's price as TypeSafe raises $870M Daily, 2026-10-09
- Claude Haiku 5.5 launches at $0.10 per million tokens, matching GPT-6 Luna Daily, 2026-10-07
- OpenAI publishes 722 AI-written math papers, claiming proofs of the quasi-Riemann hypothesis and Unique Games Daily, 2026-10-06
- Containing agents stopped being the labs' private problem Saturday edition, 2026-10-03
- Stop asking your LLM multiple-choice questions: a guide to decision models Article, 2026-10-02
- Cloudflare and AWS release open-weight decision models to rival Jev Daily, 2026-10-01
Clef FAQ
How much does Clef cost?
Clef costs $0.24 per million input tokens at Cloudflare Workers AI, OpenRouter. Output is free. Workers AI's free daily allowance covers about 460,000 Clef tokens. Checked 14 October 2026.
Is Clef open weight?
Yes. Cloudflare publishes the weights under Apache 2.0, so you can run and fine-tune it yourself.
How fast is Clef?
Cloudflare reports 152 ms median at about 800 input tokens, partly from a move to SGLang serving, measured on its own hardware. JevBench gives 0.58 seconds per decision, its estimate for self-hosting.
How does Clef compare with Jev?
On JevBench's Capability Score (board v1.7.46), Clef scores 75.3 against Jev's 77.1. Jev costs $0.042 per million input tokens; Clef costs $0.24. JevBench is a one-person project that uses Jev as its reference, which favours cheap hosted models.