Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Cloudflare’s Clef and Clef-flash are open-weight decision models that return probabilities for answers defined in advance. Cloudflare says they follow TypeSafe AI’s Jev System One API and publishes benchmark and latency figures comparing the models—but those results are vendor-reported, not independently reproduced in the sources available here.
What Clef does—and how it differs from a general language model
A decision model takes an input, such as a support message, and answers typed questions using a fixed set of allowed responses. Instead of generating free-form text that software must interpret, it returns probabilities that can help an application route a request, assign a category, or escalate a case.
Cloudflare documents three question types: noul for yes/no questions, choice to select an option, and score to assess an input against an ordered rubric. Examples include identifying a support team and estimating severity. A request can contain up to 64 questions, according to Cloudflare’s changelog.
This setup is useful when an application needs a constrained decision rather than an open-ended response. It does not by itself establish that a model’s probabilities are calibrated for every deployment; teams should assess the outputs against their own data and decision criteria.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Clef vs. Clef-flash: size and intended use
Cloudflare lists Clef as a 27B model and Clef-flash as a 9B model. Both have a listed 64K-token context window. Cloudflare positions Clef for decisions where precision is the priority and Clef-flash for latency-sensitive paths. The benchmark figures below show why it is worth comparing performance on the task that matters, rather than assuming either variant is universally better.
What Cloudflare’s benchmark comparison with Jev shows
Cloudflare says one of its Clef models ranked highest on seven of ten decision benchmarks. Its changelog reports these results for four highlighted tasks:
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
| Benchmark | Metric | Clef | Clef-flash | Jev |
|---|---|---|---|---|
| BFCL | Case exact | 98.47 | 98.76 | 95.75 |
| BANKING77 | Macro-F1 | 94.20 | 90.93 | 79.74 |
| CLINC150+OOS | Macro-F1 | 97.43 | 66.77 | 89.27 |
| Home appliances | Case exact | 82.95 | 97.73 | 52.27 |
These are Cloudflare-published figures, not results independently reproduced in the cited sources. The split is also meaningful: Clef-flash leads the listed BFCL and home-appliances results, while Clef has the higher listed scores on BANKING77 and CLINC150+OOS. Benchmark rankings therefore offer a starting point, not an across-the-board verdict about which model will work better in a particular product.
TypeSafe AI’s September 15, 2026 Jev announcement describes the company’s own workflow evaluation approach and acknowledges that evaluation-team authorship may introduce bias. As with Cloudflare’s results, treat a model maker’s reported findings as attributed evidence rather than independent confirmation.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Cloudflare’s reported latency figures
Cloudflare reports latency measurements across 43 benchmark runs. The published figures are:
| Model | Median latency | p95 latency |
|---|---|---|
| Clef | 209.3 ms | 238.6 ms |
| Clef-flash | 38.8 ms | 122.4 ms |
| Jev | 524.1 ms | 536.0 ms |
These are Cloudflare’s reported measurements; the available descriptions do not establish that an independent party reproduced them or that every model was tested under identical conditions. Treat them as a vendor comparison, not a latency guarantee for your deployment. Actual response time can depend on the model-hosting route and workload.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Does Clef work with an existing Jev integration?
Cloudflare says Clef follows Jev’s System One API and that an existing integration can switch by changing the endpoint and model. In the launch changelog, Cloudflare puts it this way: “Clef follows the System One API, so you can switch an existing Jev integration to Clef by changing the endpoint and model.”
That is Cloudflare’s compatibility claim, not independent integration testing. Before switching production traffic, check the request and response schemas, supported question types, error handling, and the behavior of your actual workflow. Confirm that downstream systems handle the returned probabilities and allowed answers as expected.
Recommended Free Tools
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Open weights, hosted inference, and local testing
Cloudflare says it released Clef’s weights under the Apache 2.0 license and offers both variants through Workers AI. The Hugging Face model card describes a multimodal model that accepts text, JSON, images, or video, and documents local inference routes using Transformers, vLLM, SGLang, and Docker Model Runner.
The model card records testing with PyTorch 2.11 and Transformers 5.10.2 on a single H200. That is a documented test configuration, not a stated hardware requirement. Teams considering local inference should check the model card and the requirements of their chosen software stack against their own hardware.
Fine-tuning availability
Cloudflare announced hands-on fine-tuning support with a forward-deployed engineering team. It also described a self-serve fine-tuning platform as a future development, but the announcement does not specify a general-availability date for self-serve access.
Quick Recap
How to assess Clef for your use case
- Match the benchmark to the job: compare the task and metric that resemble your classification or routing problem; the listed benchmark results vary by model and dataset.
- Measure your own workload: test response quality and latency with representative inputs, including cases that should be escalated or handled as uncertain.
- Validate API behavior: treat System One compatibility as a starting point, then verify the integration and downstream handling in your environment.
- Choose a deployment route: Workers AI is Cloudflare’s hosted option; the Apache 2.0 weights and documented inference tools offer paths for local experimentation.
- Plan tuning accordingly: hands-on support has been announced, while self-serve availability remains unspecified in the launch materials.
Sources
- Cloudflare Blog: Clef decision models, October 1, 2026.
- Cloudflare Developers changelog: Clef on Workers AI, October 1, 2026.
- Cloudflare Clef model card on Hugging Face, accessed October 3, 2026.
- TypeSafe AI: Introducing System One models and Jev, September 15, 2026.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
