Head to head · Inference decision · October 2026 research run
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.
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 this run | Decider | Jev | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 90 | 60 | Decider +30 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 78 | 87 | Jev +9 |
| Agent ergonomics | 13%16.2 | 80 | 84 | Jev +4 |
| Security & auth | 14%17.5 | 38 | 53 | Jev +15 |
| Payments & pricing | 10%12.5 | 60 | 20 | Decider +40 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 87 | 64 | Decider +23 |
| Transparency & trust | 7%8.8 | 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
- Pin weights by Hub tag (
v10,v2) when results must repeat. Themainbranch of each model repository changes with new versions - Read
x_p_maxfor the top probability. Since 1.3.0confidenceon choice and score answers follows TypeSafe's rescaled definition, not the top probability - Keep the server on 127.0.0.1 or put an authenticating proxy in front. It has no key option
- Count state tokens before sending. Over 32,768 the state is cut silently, and
/decidecaps context at 1,536 tokens - 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
- Put every independent question about one state into a single call. They run in parallel and the state is billed once
- Pin
jev-1.13.0instead ofjev-latestonce you've tuned confidence thresholds - Back off exponentially on 429 and 529. The limits move with demand
- 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
- 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.
Other comparisons with Decider or Jev
Machine-readable
- This page as Markdown
/compare/decider-vs-typesafe-jev.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/decider.json·/api/v1/tools/typesafe-jev.json - From a terminal
anchor compare decider typesafe-jev(the CLI) - Over MCP
compare_tools {"a": "decider", "b": "typesafe-jev"}at/mcp, no key