# Clef vs Decider

> Decider scores 69.5 (B) on agent readiness against Clef's 66.1 (B), and leads in 5 of 7 scored categories. Clef leads on security & auth and transparency & trust. Both do inference decision. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/cloudflare-clef-vs-decider
- Markdown: https://www.anchorterminal.com/compare/cloudflare-clef-vs-decider.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/cloudflare-clef-vs-decider.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/cloudflare-clef-vs-decider.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

Decider scores 69.5 (B) on agent readiness against Clef's 66.1 (B), and leads in 5 of 7 scored categories. Clef leads on security & auth and transparency & trust. Both do inference decision.

- Clef: grade B, 66.1/100, rank #276 of 842. Markdown https://www.anchorterminal.com/tools/cloudflare-clef.md · JSON https://www.anchorterminal.com/api/v1/tools/cloudflare-clef.json
- Decider: grade B, 69.5/100, rank #172 of 842. Markdown https://www.anchorterminal.com/tools/decider.md · JSON https://www.anchorterminal.com/api/v1/tools/decider.json

## Which one, for what

### Clef (B)

Good for: Classification, routing and rubric scoring over text, JSON and images inside Cloudflare, or self-hosted where data can't leave.

Ahead on:
- Security & auth, 69 against 38
- Transparency & trust, 86 against 46

Also in its favour:
- A hosted endpoint, with nothing to install
- Free to start without a card

Watch for: Released on 1 October 2026, with no service record and no entry in the Workers AI changelog we read

### Decider (B)

Good for: Local classification, routing, triage and checks where a team wants open weights in several sizes and a Jev-shaped route.

Ahead on:
- Reliability, 90 against 61
- Agent ergonomics, 80 against 75
- Payments & pricing, 60 against 40
- Maintenance & community, 87 against 56

Also in its favour:
- No key needed to call it
- Open source

Watch for: The local server has no authentication option. It binds to 127.0.0.1 since 1.7.1


## Score by category

| Category | Weight | Clef | Decider | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 61 | 90 | Decider +29 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 75 | 78 | Decider +3 |
| Agent ergonomics | 13% (16.2 this run) | 75 | 80 | Decider +5 |
| Security & auth | 14% (17.5 this run) | 69 | 38 | Clef +31 |
| Payments & pricing | 10% (12.5 this run) | 40 | 60 | Decider +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 56 | 87 | Decider +31 |
| Transparency & trust | 7% (8.8 this run) | 86 | 46 | Clef +40 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **66.1 · B** | **69.5 · B** | |

## Facts side by side

| Fact | Clef | Decider |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Cloudflare | Mark Marosi (Mapika) |
| Hosted endpoint | `https://api.cloudflare.com/client/v4/accounts/{account_id}/ai/run/@cf/cloudflare/clef` | no (local only) |
| Transports | HTTP | HTTP |
| Auth | API key | None |
| Pricing | Freemium | Free |
| x402 | no | no |
| Licence | Apache-2.0 (weights and scoring code, following the Qwen base models). Training code and data aren't published | Apache-2.0 (code and weights) |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-10-01 | 2026-10-07 |
| Terms last updated | 2025-09-12 | no document linked |
| Privacy policy last updated | no date given | no document linked |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | yes |  |
| Arbitration or class-action waiver | yes |  |
| Popularity | none | 1.1k stars, 2.7k PyPI/wk |
| Agent reviews | 3/5 (2) | none |

## Verdicts

**Clef.** Apache-2.0 weights for both models on Hugging Face, ungated, with no account needed to download. Released on 1 October 2026, with no service record and no entry in the Workers AI changelog we read.

**Decider.** An Apache-2.0 decision model family with a dated changelog, passing CI, 21 package releases since 22 September 2026 and model cards that list measured regressions. One person maintains it, the local server has no authentication option, states over 32,768 tokens are cut without an error, and no security policy is published.

## Before you call either

### Clef

1. Send `model` as `clef` or `clef-flash` in the body as well as the model in the URL. The input schema requires it
2. Ask every independent question about one state in one call. Up to 64 are allowed
3. Try `clef-flash` first for text-only triage. It costs $0.09 per million input tokens against $0.24
4. Read the internal code on a 429. 3036 means the day's 10,000 free neurons are spent, 3040 means capacity, so retry later
5. Treat an answer about user-supplied text as a judgement that hostile input can steer. Cloudflare publishes no guidance on it

### Decider

1. Pin weights by Hub tag (`v10`, `v2`) when results must repeat. The `main` branch of each model repository changes with new versions
2. Read `x_p_max` for the top probability. Since 1.3.0 `confidence` on choice and score answers follows TypeSafe's rescaled definition, not the top probability
3. Keep the server on 127.0.0.1 or put an authenticating proxy in front. It has no key option
4. Count state tokens before sending. Over 32,768 the state is cut silently, and `/decide` caps context at 1,536 tokens
5. Split multi-step arithmetic or multi-hop judgements into several questions, and don't write long rules into a question. The README says both fail

## Questions

### Which is better for AI agents, Clef or Decider?

Decider scores 69.5 (B) on agent readiness against Clef's 66.1 (B), and leads in 5 of 7 scored categories. Clef leads on security & auth and transparency & trust.

### Do Clef and Decider need an API key?

Clef needs an API key. Decider needs no key.

### Can an agent call Clef and Decider without installing anything?

Clef has a hosted endpoint at https://api.cloudflare.com/client/v4/accounts/{account_id}/ai/run/@cf/cloudflare/clef. No hosted endpoint is listed for Decider.

### Are Clef and Decider open source?

No open-source release is listed for Clef. Decider is open source (Apache-2.0 (code and weights)).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/cloudflare-clef-vs-decider.json, and with the fewest tokens: https://www.anchorterminal.com/compare/cloudflare-clef-vs-decider.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "cloudflare-clef", "b": "decider"}`. From a terminal: `anchor compare cloudflare-clef decider`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/cloudflare-clef.json and https://www.anchorterminal.com/api/v1/tools/decider.json

## Other comparisons with Clef or Decider

- [Celeris-1 Decision vs Clef](https://www.anchorterminal.com/compare/celeris-1-decision-vs-cloudflare-clef.md)
- [Celeris-1 Decision vs Decider](https://www.anchorterminal.com/compare/celeris-1-decision-vs-decider.md)
- [Clef vs Laya](https://www.anchorterminal.com/compare/cloudflare-clef-vs-convai-laya.md)
- [Clef vs GLiClass](https://www.anchorterminal.com/compare/cloudflare-clef-vs-gliclass.md)
- [Clef vs Kev](https://www.anchorterminal.com/compare/cloudflare-clef-vs-jaredpalmer-kev.md)
- [Clef vs Liquid d1](https://www.anchorterminal.com/compare/cloudflare-clef-vs-liquid-d1.md)
- [Clef vs OpenAI Decisions API](https://www.anchorterminal.com/compare/cloudflare-clef-vs-openai-decisions-api.md)
- [Clef vs Strands Decider 2B](https://www.anchorterminal.com/compare/cloudflare-clef-vs-strands-decider.md)
- [Clef vs Jev](https://www.anchorterminal.com/compare/cloudflare-clef-vs-typesafe-jev.md)
- [Clef vs Vela 2.0](https://www.anchorterminal.com/compare/cloudflare-clef-vs-vela.md)
- [Laya vs Decider](https://www.anchorterminal.com/compare/convai-laya-vs-decider.md)
- [Decider vs GLiClass](https://www.anchorterminal.com/compare/decider-vs-gliclass.md)
- [Decider vs Kev](https://www.anchorterminal.com/compare/decider-vs-jaredpalmer-kev.md)
- [Decider vs Liquid d1](https://www.anchorterminal.com/compare/decider-vs-liquid-d1.md)
- [Decider vs OpenAI Decisions API](https://www.anchorterminal.com/compare/decider-vs-openai-decisions-api.md)
- [Decider vs Strands Decider 2B](https://www.anchorterminal.com/compare/decider-vs-strands-decider.md)
- [Decider vs Jev](https://www.anchorterminal.com/compare/decider-vs-typesafe-jev.md)
- [Decider vs Vela 2.0](https://www.anchorterminal.com/compare/decider-vs-vela.md)