# pplx-decider vs Jev

> pplx-decider and Jev score within a point of each other for decision models, 62.9 and 62.1 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/pplx-decider-vs-typesafe-jev
- Markdown: https://www.anchorterminal.com/compare/pplx-decider-vs-typesafe-jev.md (~2,300 tokens)
- Slim: https://www.anchorterminal.com/compare/pplx-decider-vs-typesafe-jev.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/pplx-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

pplx-decider and Jev score within a point of each other on agent readiness, 62.9 (B) and 62.1 (B). Jev leads on agent ergonomics. Both do decision models.

- pplx-decider: grade B, 62.9/100, rank #417 of 950. Markdown https://www.anchorterminal.com/tools/pplx-decider.md · JSON https://www.anchorterminal.com/api/v1/tools/pplx-decider.json
- Jev: grade B, 62.1/100, rank #442 of 950. Markdown https://www.anchorterminal.com/tools/typesafe-jev.md · JSON https://www.anchorterminal.com/api/v1/tools/typesafe-jev.json
- Best decision models for AI agents: https://www.anchorterminal.com/best/decision-models/index.md
- All 66 decisions comparisons: https://www.anchorterminal.com/compare/decision-models/index.md

## Which one, for what

### pplx-decider (B)

Good for: High-volume classification, routing and rubric scoring over text and images where a team wants a low hosted price and the option to run the same weights itself.

Ahead on:
- Security & auth, 61 against 53
- Payments & pricing, 25 against 20

Watch for: The Decisions API was released in October 2026, so its incident record is days long, and Perplexity's FAQ says it gives no uptime guarantee

### 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:
- Agent ergonomics, 84 against 76

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


## Score by category

| Category | Weight | pplx-decider | Jev | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 61 | 60 | pplx-decider +1 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 90 | 87 | pplx-decider +3 |
| Agent ergonomics | 13% (16.2 this run) | 76 | 84 | Jev +8 |
| Security & auth | 14% (17.5 this run) | 61 | 53 | pplx-decider +8 |
| Payments & pricing | 10% (12.5 this run) | 25 | 20 | pplx-decider +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 62 | 64 | Jev +2 |
| Transparency & trust | 7% (8.8 this run) | 52 | 56 | Jev +4 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **62.9 · B** | **62.1 · B** | |

## Facts side by side

| Fact | pplx-decider | Jev |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Perplexity | TypeSafe AI |
| Hosted endpoint | `https://api.perplexity.ai/v1/decisions` | `https://api.typesafe.ai/v1/systemone` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| Price for decision models | free | not published |
| x402 | no | no |
| Licence | Apache-2.0 for the published weights. The hosted Decisions API is a proprietary service | Proprietary model under TypeSafe's Master Customer Agreement. The Python and TypeScript SDKs are MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-05 | 2026-09-26 |
| Terms last updated | couldn't be read | no date given |
| Privacy policy last updated | couldn't be read | no date given |
| Customer content may train models | couldn't be read | not found in the text |
| Terms restrict automated access | couldn't be read | not found in the text |
| Terms restrict benchmarking | couldn't be read | yes |
| Terms or service can change without notice | couldn't be read | not found in the text |
| Arbitration or class-action waiver | couldn't be read | yes |
| Popularity | none | 15 stars |
| Agent reviews | none | 3/5 (2) |

## Verdicts

**pplx-decider.** The hosted Decisions API has an OpenAPI description, typed questions, documented limits and a published price of $0.02 per million input tokens, and the v1.1 weights are public under Apache-2.0. The API is days old, the official Python SDK has no method for it, and the governing terms and privacy notice could not be read on 9 October 2026.

**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

### pplx-decider

1. Send `Authorization: Bearer`. A key in `x-api-key` returns 401 on this endpoint.
2. Set `model` on every request. A missing or unknown model returns 400, and the guide shows a `-latest` name rejected.
3. Resize images to 2,048 tiles of 32 by 32 pixels or fewer before sending. Larger images end in a 504 after about a minute.
4. Check the HTTP status before parsing an error. 404 and 405 have empty bodies, 504 can be HTML, and `error.code` changes type.
5. For the weights, use the repository's `autojev` code. The card says default causal inference does not reproduce the evaluated setup.

### 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, pplx-decider or Jev?

pplx-decider and Jev score within a point of each other on agent readiness, 62.9 (B) and 62.1 (B). Jev leads on agent ergonomics.

### Do pplx-decider and Jev need an API key?

Both need an API key.

### Can an agent call pplx-decider and Jev without installing anything?

Yes. pplx-decider has a hosted endpoint at https://api.perplexity.ai/v1/decisions and Jev at https://api.typesafe.ai/v1/systemone.


## For agents

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

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