C

Clef

Sep 2026
CClef
Compare in
on
—per task?
$0.24 / —per 1M in / out?
—output speed?
66Kcontext

Ranking?

Full ranking →
1Celeris-1 Decision632Jev 1.14783D1 Ultra934Decider Flash v1.21105Jev 1.13127
···
13D129914Clef30915Mercury Decide500

Run it yourself

estimate
Fits on✗ 8 GB (phone, laptop)✗ 16 GB✓ 24 GB GPU · compressed✓ 48 GB GPU · 8-bit✓ 80 GB GPU · full quality
LicenceApache-2.0free for commercial use

Benchmarks

in Decision models
AA Decision Index v1.048.6#12
AA Decision cost per task v1.00#15
AA Decision time per task v1.0309#14
AA Decision · Omniscience accuracy39#5
AA Decision · Omniscience non-hallucination rate4.3#11
AA Decision · Humanity's Last Exam text multiple-choice accuracy11.1#10
AA Decision · When2Call accuracy71#13
AA Decision · WildGuardTest average F190.7#11
Community Decision Index 0.4.154.9#30
JevBench v1.6.116.8#3
JevBench v1.6.37 · open capability75.3#2

FAQ

How much does Clef cost?›

$0.24 per 1M input tokens and — per 1M output tokens; cheapest via OpenRouter at $0.042 / $0.

Is Clef free to use?›

There is no free API; the cheapest paid price is $0.042 per 1M input tokens. The weights are open, so you can run it yourself.

How good is Clef, and what is it best at?›

#12 of 15 in Decision models.

Is Clef better than D1?›

On AA Decision time per task v1.0, Clef scores 309 vs 299 — lower.

How can I use Clef?›

Through the API of DeepInfra, OpenRouter.

What is the context window of Clef?›

66K tokens.

When was Clef released? Is there a newer version?›

Released 2026-09-30. It is the current version in its line.

Is Clef open source?›

Yes, the weights are open (Apache-2.0 licence).

Can I run Clef locally?›

The weights are open and can be self-hosted; hardware needs are not confirmed yet.

Can Clef read images?›

It accepts text and images, video as input.

What is Clef?›

Clef is an open-weights language model from Cloudflare, released Sep 2026.

What are the best alternatives to Clef?›

Celeris-1 Decision (better), Decider Flash v1.2 (open weights).