Mammoth-1 vs Cloudflare Clef

Official Base Labs banner from the baselabs/mammoth-1 model card — baselabs/mammoth-1 card assets/banner.png. Source · License: MIT.

Verdict. Pick Mammoth-1 (or the 9B Elephant-1 sibling on the same page) if you want Base Labs’ MIT-tagged Qwen3.5 decision pair with a System One / OneJev path and a 16,384-token card length. Pick Cloudflare Clef if you want the Apache-2.0 27B decision model already sourced on this site (Qwen3.8-27B post-train; text/JSON/image/video). Decision Index rows that name Clef stay vendor. We have no sourced bake-off.

Compare Mammoth-1 and Cloudflare Clef.

Dimension	Mammoth-1	Cloudflare Clef	Source
License	MIT (card tag; LICENSE blob 404)	Apache-2.0 (card tag)	Hugging Face cards (2026-10-23 / 2026-10-13)
Gating	No	No (2026-10-13 check)	Hugging Face API
Developer	Base Labs (Baseten)	Cloudflare	Official cards
Parameters	27B (mammoth-1); 9B sibling elephant-1	27B	Official cards
Base model named	Qwen3.5-27B (elephant-1 from Qwen3.5-9B)	Qwen3.8-27B	Official cards
Modalities	text + images	text, JSON, image, video	Official cards
Context / sequence	16,384 tokens (card)	Not independently verified on this site	mammoth-1 card; Clef page
Job	Decision model; noul / choice / score; one shared-prefix prefill	Decision model; schema options; one forward pass; no free-text	Official cards
Serving named	OneJev setup.sh; Baseten System One slugs	Hugging Face card (no sourced cookbook on this site)	Official cards / Baseten docs
Hugging Face likes	44 on mammoth-1; 34 on elephant-1 (2026-10-23)	2,074 (2026-10-13)	Hugging Face API
Quality vs closed classification APIs	Not independently tested	Not independently tested	n/a

When to choose which

MIT-tagged 27B + 9B pair: Mammoth-1 — Card tags only; LICENSE files 404’d. Elephant-1 lives on the Mammoth-1 page.
Video named as an input: Cloudflare Clef — Clef’s page lists video. Mammoth/Elephant cards name text and images.
Published System One / OneJev recipe: Mammoth-1 — Card setup.sh + Baseten docs. Untested here.
Higher sourced Hugging Face likes (identification only): Cloudflare Clef — 2,074 likes on 2026-10-13 vs 44 on mammoth-1 (2026-10-23). Not a quality column.

Read the entity pages: Mammoth-1 (covers Elephant-1) and Cloudflare Clef. Both hang off LLM classification APIs.

Why this comparison exists

Both cards are 27B-class decision models: typed options in, probabilities out, not chat. Mammoth-1/Elephant-1 opened as ungated MIT-tagged Qwen3.5 post-trains on 2026-10-19. Clef is the decision row this site already sourced (Apache-2.0, 2026-10-13). Searchers who know Clef need a same-site fact sheet for the new Base Labs pair. This is identification, not a bake-off.

Sourced snapshot (2026-10-23 / Clef 2026-10-13)

Field	Mammoth-1	Cloudflare Clef
Host	huggingface.co/baselabs/mammoth-1 (not gated)	huggingface.co/Cloudflare/clef
HF likes	44 (2026-10-23); sibling elephant-1 34	2,074 (2026-10-13)
License	MIT (card tag; LICENSE 404)	Apache-2.0
Size	27B; 9B sibling	27B
Base named	Qwen3.5-27B	Qwen3.8-27B
Inputs	text + images	text, JSON, image, video
Sequence	16,384 tokens (card)	Not independently verified here
Official serve path	OneJev setup.sh; Baseten System One	Card only on this site
Quality vs closed APIs	Not independently tested	Not independently tested

License

Mammoth-1 and Elephant-1 tag MIT; LICENSE files 404’d on 2026-10-23. Clef tags Apache-2.0 as of 2026-10-13. Not legal advice.

How to choose

Need the MIT 27B / 9B System One pair: Mammoth-1.
Need the Apache-2.0 27B card that also names video: Cloudflare Clef.
Need a chat MoE instead: closed LLM APIs.

LiquidAI d1 stays on the classification watch list. See Models.

FAQ

Does Mammoth-1 beat Clef on the Jev Decision Index?

The mammoth-1 card prints 71.24 vs Clef 55.7 on Jev Decision Index 0.4. That row is vendor/self-reported. We do not treat it as a forkalt ranking.

Are these chat models?

No. Both pages describe decision models that score typed options instead of writing prose. Chat-style weights live on closed LLM APIs.

Where is Elephant-1?

On the Mammoth-1 page as the 9B sibling. There is no /models/elephant-1 URL.

Can I use them commercially?

Mammoth-1/Elephant-1 tag MIT; Clef tags Apache-2.0. Mammoth LICENSE files 404’d in this check. Not legal advice.

Sources & verification

Last verified 2026-10-23 · Last updated 2026-10-23· Edited by forkalt editors · Editorial policy

License notes are not legal advice. Read the original LICENSE. Trademark & disclaimer.