Comparison
Jev vs Laya vs Cloudflare Clef: decision models compared
Key takeaways
- All three sit in the System One decision model category: state + typed questions → probabilities.
- Jev: TypeSafe first-party host, ~$0.042/M input, output free.
- Laya: Jev-compatible host, open-source lineage, ~$0.036/M PAYG, MCP + Guard.
- Cloudflare Clef: Workers AI + open weights + vision; hosted ~$0.09–$0.24/M.
- Pick by stack and constraints, not a single benchmark screenshot.
Table of contents
Quick answer
If you want the original TypeSafe product and SDKs, start with Jev. If you want a cheaper compatible host with agent MCP tooling, try Laya. If you already run on Cloudflare and need edge hosting, vision, or self-hostable weights, use Clef (or Clef-flash on the hot path).
These models decide. They do not draft. If your job is generative, you are in the wrong aisle.
Last verified: October 2026. Background: what is a System One decision model.
Side-by-side
| Criteria | Jev | Laya | Cloudflare Clef |
|---|---|---|---|
| Vendor | TypeSafe | Laya Studio (independent) | Cloudflare |
| Model access | Hosted API | Hosted API (+ open lineage) | Workers AI + HF weights |
| API shape | System One | Jev-compatible System One | Jev-compatible System One |
| Question types | Choice, Score, Noul | Choice, score, noul | noul, choice, score |
| Multimodal | Text/JSON focus | Text/JSON focus | Text/JSON + images |
| Agent extras | SDKs, cookbooks, skill | MCP + Guard | Workers binding, AI Gateway, fine-tune path |
| Open weights | No (proprietary) | Model lineage open; Studio hosted | Yes (Apache 2.0) |
| Directory | /tool/jev | /tool/laya | /tool/cloudflare-clef |
Price comparison
Hosted list signals (re-verify on publish day):
| Product | Hosted input / 1M | Notes |
|---|---|---|
| Laya PAYG | ~$0.0357 | Monthly plans can go lower per token |
| Jev (TypeSafe) | ~$0.042 | Output free (marketed) |
| Clef-flash | ~$0.09 | Workers AI neurons billing |
| Clef | ~$0.24 | Workers AI neurons billing |
How to avoid fooling yourself:
- Clef’s sticker is higher on purpose if you value CF edge + vision + open weights.
- Self-hosting Clef/Laya weights trades $/M API for GPU ops cost.
- Third-party Jev mirrors may undercut TypeSafe list; know which endpoint you trust.
- Quality is not price. Run your label set before you standardize.
Pick by job
| If you want… | Pick | Why |
|---|---|---|
| First-party TypeSafe support + SDKs | Jev | Clearest official product path |
| Cheapest simple hosted text decisions | Laya (often) | Lower PAYG list vs Jev/Clef |
| MCP tools in Cursor/Claude agents | Laya | MCP + Guard are productized |
| Workers AI / AI Gateway native | Clef | Binding + CF ops model |
| Image/video-ish state in decisions | Clef | Vision extensions |
| Open weights you can download | Clef (primary) / Laya lineage | Apache-2.0 paths |
| Lowest latency on CF network | Clef-flash | Designed for hot path |
A simple way to think about it: Jev is the reference host, Laya is the compatible value host, Clef is the Cloudflare + open-weight lane.
Migration notes
If you already call Jev:
- Freeze a golden set of states + questions + expected thresholds.
- Point a second client at Laya or Clef with the same payload shape.
- Compare agreement rate, latency p50/p95, and $/1k decisions.
- Only then change production endpoints.
“Drop-in compatible” is a claim about JSON shape, not about identical probabilities.
Deep dives: Jev review, Laya review, Cloudflare Clef review.
FAQ
Jev vs Laya vs Clef: which should I use?
Pick Jev for TypeSafe’s first-party hosted model and SDKs. Pick Laya for a cheaper Jev-compatible host with MCP/Guard. Pick Cloudflare Clef if you want Workers AI, vision, and Apache 2.0 weights on the Cloudflare stack.
Which decision model is cheapest hosted?
On published Oct 2026 list signals, Laya PAYG ($0.036/M) and Jev ($0.042/M) undercut hosted Clef (~$0.09 to $0.24/M). Self-hosting open weights changes the math. Always re-check live pricing.
Are Laya and Clef drop-in replacements for Jev?
Both market System One / Jev-compatible request shapes. Treat “drop-in” as a starting point: re-test questions, thresholds, and latency on your traffic.
Which decision model supports images?
Cloudflare Clef is the multimodal option in this set (embedded images with documented limits). Jev and Laya are primarily text/JSON state APIs in our verified notes.
Do decision models replace Claude or ChatGPT?
No. They adjudicate bounded questions. Keep generative models for writing, planning, and open-ended tool use.
3 curated tools below.
Jev
Jev is TypeSafe's flagship System One decision model: send application state plus typed Choice, Score, and Noul questions, and get calibrated probabilities your code can branch on, without generating free-form text.
Laya
Laya Studio hosts the open-source Laya System One decision model behind a Jev-compatible API: send state and typed questions, get answers with probabilities in one forward pass, plus optional MCP tools and a guard endpoint.
Cloudflare Clef
Cloudflare Clef and Clef-flash are open-source (Apache 2.0) System One decision models on Workers AI: multimodal state plus typed noul/choice/score questions return probabilities, with a Jev-compatible API shape and optional fine-tuning path.
| Tool | Best for | Pricing | Billing note |
|---|---|---|---|
| Jev | Productivity | Paid | Paid Service |
| Laya | AI Agent | Freemium | Free Trial |
| Cloudflare Clef | AI Agent | Freemium | Free Trial |
Frequently asked questions
Jev vs Laya vs Clef: which should I use?
Pick Jev for TypeSafe’s first-party hosted model and SDKs. Pick Laya for a cheaper Jev-compatible host with MCP/Guard. Pick Cloudflare Clef if you want Workers AI, vision, and Apache 2.0 weights on the Cloudflare stack.
Which decision model is cheapest hosted?
On published Oct 2026 list signals, Laya PAYG (~$0.036/M) and Jev (~$0.042/M) undercut hosted Clef (~$0.09 to $0.24/M). Self-hosting open weights changes the math. Always re-check live pricing.
Are Laya and Clef drop-in replacements for Jev?
Both market System One / Jev-compatible request shapes. Treat “drop-in” as a starting point: re-test questions, thresholds, and latency on your traffic.
Which decision model supports images?
Cloudflare Clef is the multimodal option in this set (embedded images with documented limits). Jev and Laya are primarily text/JSON state APIs in our verified notes.
Do decision models replace Claude or ChatGPT?
No. They adjudicate bounded questions. Keep generative models for writing, planning, and open-ended tool use.