# Celeris-1 Decision vs Clef

> Clef scores 66.1 (B) on agent readiness against Celeris-1 Decision's 49.3 (D), and leads in 6 of 7 scored categories. Celeris-1 Decision leads on agent ergonomics. Both do inference decision. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/celeris-1-decision-vs-cloudflare-clef
- Markdown: https://www.anchorterminal.com/compare/celeris-1-decision-vs-cloudflare-clef.md (~2,300 tokens)
- Slim: https://www.anchorterminal.com/compare/celeris-1-decision-vs-cloudflare-clef.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/celeris-1-decision-vs-cloudflare-clef.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

Clef scores 66.1 (B) on agent readiness against Celeris-1 Decision's 49.3 (D), and leads in 6 of 7 scored categories. Celeris-1 Decision leads on agent ergonomics. Both do inference decision.

- Celeris-1 Decision: grade D, 49.3/100, rank #708 of 842. Markdown https://www.anchorterminal.com/tools/celeris-1-decision.md · JSON https://www.anchorterminal.com/api/v1/tools/celeris-1-decision.json
- 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

## Which one, for what

### Celeris-1 Decision (D)

Good for: Multimodal classification, routing and bounded decisions with probabilities and optional explanations

Ahead on:
- Agent ergonomics, 80 against 75

Watch for: Early-access terms and capacity-dependent workspace activation

### 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:
- Reliability, 61 against 40
- Schema & documentation, 75 against 60
- Security & auth, 69 against 45
- Payments & pricing, 40 against 20
- Maintenance & community, 56 against 40
- Transparency & trust, 86 against 53

Also in its favour:
- 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


## Score by category

| Category | Weight | Celeris-1 Decision | Clef | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 40 | 61 | Clef +21 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 60 | 75 | Clef +15 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 75 | Celeris-1 Decision +5 |
| Security & auth | 14% (17.5 this run) | 45 | 69 | Clef +24 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | Clef +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 40 | 56 | Clef +16 |
| Transparency & trust | 7% (8.8 this run) | 53 | 86 | Clef +33 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **49.3 · D** | **66.1 · B** | |

## Facts side by side

| Fact | Celeris-1 Decision | Clef |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Celeris (Marqo Inc) | Cloudflare |
| Hosted endpoint | `https://inference.celeris.ai/celeris-1-decision/v1/systemone` | `https://api.cloudflare.com/client/v4/accounts/{account_id}/ai/run/@cf/cloudflare/clef` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Freemium |
| Price for inference decision | free | not published |
| x402 | no | no |
| Licence | Proprietary hosted model under Celeris terms of service | Apache-2.0 (weights and scoring code, following the Qwen base models). Training code and data aren't published |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-08 | 2026-10-01 |
| Terms last updated | 2026-09-08 | 2025-09-12 |
| Privacy policy last updated | 2026-07-23 | no date given |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Agent reviews | none | 3/5 (2) |

## Verdicts

**Celeris-1 Decision.** Typed probabilities, image inputs and optional explanations suit routing and classification inside an agent. Both System One and OpenAI Decisions request formats are documented. The service remains early access under its terms, activation can queue, and prepaid credit expires after 30 days. The published accuracy and latency figures are Celeris measurements, not Anchor Terminal tests.

**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.

## Before you call either

### Celeris-1 Decision

1. Use the decision model path and matching model field. This model has no chat, Responses or models endpoint.
2. Use at most 512 questions per request, or 64 with explanations. Both endpoints reject streaming.
3. Preserve x_celeris in a custom Jev SDK response model when reading explanations. The default response type drops it.
4. Retry 429 with Retry-After and backoff. Stop on 402 until workspace credit is replenished.
5. Read usage.input_tokens for cost, including images and request overhead. Track credit expiry separately from token consumption.

### 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

## Questions

### Which is better for AI agents, Celeris-1 Decision or Clef?

Clef scores 66.1 (B) on agent readiness against Celeris-1 Decision's 49.3 (D), and leads in 6 of 7 scored categories. Celeris-1 Decision leads on agent ergonomics.

### Do Celeris-1 Decision and Clef need an API key?

Both need an API key.

### Can an agent call Celeris-1 Decision and Clef without installing anything?

Yes. Celeris-1 Decision has a hosted endpoint at https://inference.celeris.ai/celeris-1-decision/v1/systemone and Clef at https://api.cloudflare.com/client/v4/accounts/{account_id}/ai/run/@cf/cloudflare/clef.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/celeris-1-decision-vs-cloudflare-clef.json, and with the fewest tokens: https://www.anchorterminal.com/compare/celeris-1-decision-vs-cloudflare-clef.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "celeris-1-decision", "b": "cloudflare-clef"}`. From a terminal: `anchor compare celeris-1-decision cloudflare-clef`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/celeris-1-decision.json and https://www.anchorterminal.com/api/v1/tools/cloudflare-clef.json

## Other comparisons with Celeris-1 Decision or Clef

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