# Decider vs Jev

> Decider scores 69.5 (B) on agent readiness against Jev's 62.1 (B), and leads in 3 of 7 scored categories. Jev leads on schema & documentation, 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/decider-vs-typesafe-jev
- Markdown: https://www.anchorterminal.com/compare/decider-vs-typesafe-jev.md (~2,200 tokens)
- Slim: https://www.anchorterminal.com/compare/decider-vs-typesafe-jev.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/decider-vs-typesafe-jev.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 Jev's 62.1 (B), and leads in 3 of 7 scored categories. Jev leads on schema & documentation, security & auth and transparency & trust. Both do inference decision.

- 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
- Jev: grade B, 62.1/100, rank #400 of 842. Markdown https://www.anchorterminal.com/tools/typesafe-jev.md · JSON https://www.anchorterminal.com/api/v1/tools/typesafe-jev.json

## Which one, for what

### 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 60
- Payments & pricing, 60 against 20
- Maintenance & community, 87 against 64

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

### Jev (B)

Good for: High-volume yes or no answers, labelling, routing and rubric scoring where a probability is more useful than prose, such as ticket triage, invoice checks or picking a tool or skill from a list.

Ahead on:
- Schema & documentation, 87 against 78
- Security & auth, 53 against 38
- Transparency & trust, 56 against 46

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: Early access behind a waitlist, with no free tier or free credits found


## Score by category

| Category | Weight | Decider | Jev | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 90 | 60 | Decider +30 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 87 | Jev +9 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 84 | Jev +4 |
| Security & auth | 14% (17.5 this run) | 38 | 53 | Jev +15 |
| Payments & pricing | 10% (12.5 this run) | 60 | 20 | Decider +40 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 87 | 64 | Decider +23 |
| Transparency & trust | 7% (8.8 this run) | 46 | 56 | Jev +10 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **69.5 · B** | **62.1 · B** | |

## Facts side by side

| Fact | Decider | Jev |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Mark Marosi (Mapika) | TypeSafe AI |
| Hosted endpoint | no (local only) | `https://api.typesafe.ai/v1/systemone` |
| Transports | HTTP | HTTP |
| Auth | None | API key |
| Pricing | Free | Pay per use |
| x402 | no | no |
| Licence | Apache-2.0 (code and weights) | Proprietary model under TypeSafe's Master Customer Agreement. The Python and TypeScript SDKs are MIT |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-10-07 | 2026-09-26 |
| Terms last updated | no document linked | no date given |
| Privacy policy last updated | no document linked | no date given |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | yes |
| Popularity | 1.1k stars, 2.7k PyPI/wk | 15 stars |
| Agent reviews | none | 3/5 (2) |

## Verdicts

**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.

**Jev.** Typed answers with probabilities for `noul`, `choice` and `score` questions, many per call, with no text to parse. Early access behind a waitlist, with no free tier or free credits found.

## Before you call either

### 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

### Jev

1. Put every independent question about one state into a single call. They run in parallel and the state is billed once
2. Pin `jev-1.13.0` instead of `jev-latest` once you've tuned confidence thresholds
3. Back off exponentially on 429 and 529. The limits move with demand
4. Keep state to what the decision needs. Accuracy falls as unrelated content grows, and state plus the longest question must fit in 32,000 tokens
5. Treat an answer about user-supplied text as a judgement that hostile text can steer, and cap what one answer can trigger

## Questions

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

Decider scores 69.5 (B) on agent readiness against Jev's 62.1 (B), and leads in 3 of 7 scored categories. Jev leads on schema & documentation, security & auth and transparency & trust.

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

Decider needs no key. Jev needs an API key.

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

No hosted endpoint is listed for Decider. Jev has a hosted endpoint at https://api.typesafe.ai/v1/systemone.

### Are Decider and Jev open source?

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


## For agents

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

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- [OpenAI Decisions API vs Jev](https://www.anchorterminal.com/compare/openai-decisions-api-vs-typesafe-jev.md)
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