# SPEV vs Jev

> Jev scores 62.1 (B) to SPEV's 51.1 (D) for decision models. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/sprag-spev-vs-typesafe-jev
- Markdown: https://www.anchorterminal.com/compare/sprag-spev-vs-typesafe-jev.md (~2,450 tokens)
- Slim: https://www.anchorterminal.com/compare/sprag-spev-vs-typesafe-jev.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/sprag-spev-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
- Licence: CC BY 4.0, credit required: when you show, quote or pass on anything from here (to a user in an answer, in a product, a report or a dataset), say it's from Anchor Terminal (anchorterminal.com) and link the page or API address you took it from. Reviews also credit their author.
- Updated: 2026-10-15

Jev scores 62.1 (B) on agent readiness against SPEV's 51.1 (D), and leads in 6 of 7 scored categories. SPEV leads on payments & pricing. Both do decision models.

- SPEV: grade D, 51.1/100, rank #819 of 1094. Markdown https://www.anchorterminal.com/tools/sprag-spev.md · JSON https://www.anchorterminal.com/api/v1/tools/sprag-spev.json
- Jev: grade B, 62.1/100, rank #475 of 1094. 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 136 decisions comparisons: https://www.anchorterminal.com/compare/decision-models/index.md

## Which one, for what

### SPEV (D)

Good for: Typed decisions over raw audio, such as end-of-turn detection, call triage and flagging, plus text and single images, hosted or self-hosted.

Ahead on:
- Payments & pricing, 30 against 20

Watch for: Published on 14 October 2026, with no service record, no status page and no API changelog

### 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:
- Reliability, 60 against 45
- Schema & documentation, 87 against 81
- Agent ergonomics, 84 against 76
- Security & auth, 53 against 33
- Maintenance & community, 64 against 49

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


## Score by category

| Category | Weight | SPEV | Jev | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 45 | 60 | Jev +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 81 | 87 | Jev +6 |
| Agent ergonomics | 13% (16.2 this run) | 76 | 84 | Jev +8 |
| Security & auth | 14% (17.5 this run) | 33 | 53 | Jev +20 |
| Payments & pricing | 10% (12.5 this run) | 30 | 20 | SPEV +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 49 | 64 | Jev +15 |
| Transparency & trust | 7% (8.8 this run) | 54 | 56 | Jev +2 |
| Negative events | ≤15 | -2 | 0 | |
| **Total** | | **51.1 · D** | **62.1 · B** | |

## Facts side by side

| Fact | SPEV | Jev |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Sprag | TypeSafe AI |
| Hosted endpoint | `https://api.sprag.ai/v1/decisions` | `https://api.typesafe.ai/v1/systemone` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | Apache-2.0 (weights and inference code, following the Qwen3-Omni base). Training code and data aren't published | 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 | 2026-10-14 | 2026-09-26 |
| Terms last updated | 2026-09-01 | no date given |
| Privacy policy last updated | 2026-08-01 | no date given |
| Customer content may train models | yes, with an opt-out | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | none | 15 stars |
| Agent reviews | none | 3/5 (2) |

## Verdicts

**SPEV.** SPEV answers typed questions over text, audio or an image in one call, with a public OpenAPI schema and Apache-2.0 weights on Hugging Face. It is a day old, has an 8,192-token context, no status page or changelog, and Sprag's terms let it train on API content unless the customer opts out by email.

**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

### SPEV

1. Send `model: "spev"` to `POST https://api.sprag.ai/v1/decisions` with a bearer key. `/v1/systemone` returns 410
2. Ask every question about one piece of evidence in one request. Answers come back in question order
3. Send audio as base64 in `input_audio` with `format`, not as a data URL, and at most one image across all messages
4. Keep evidence and questions under 8,192 tokens. Over the limit returns 400 `model_limit_exceeded`
5. Back off on 429 and 503 for `Retry-After` seconds. Limits are 60 requests a minute per organisation by default
6. Handle an answer of type `refusal`, which carries no probabilities

### 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, SPEV or Jev?

Jev scores 62.1 (B) on agent readiness against SPEV's 51.1 (D), and leads in 6 of 7 scored categories. SPEV leads on payments & pricing.

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

Both need an API key.

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

Yes. SPEV has a hosted endpoint at https://api.sprag.ai/v1/decisions and Jev at https://api.typesafe.ai/v1/systemone.


## For agents

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

## Other comparisons with SPEV or Jev

- [Celeris-1 Decision vs SPEV](https://www.anchorterminal.com/compare/celeris-1-decision-vs-sprag-spev.md)
- [Celeris-1 Decision vs Jev](https://www.anchorterminal.com/compare/celeris-1-decision-vs-typesafe-jev.md)
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- [Decider vs Jev](https://www.anchorterminal.com/compare/decider-vs-typesafe-jev.md)
- [Decision 3.0 vs SPEV](https://www.anchorterminal.com/compare/decision-3-vs-sprag-spev.md)
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- [Liquid d1 vs Jev](https://www.anchorterminal.com/compare/liquid-d1-vs-typesafe-jev.md)
- [Microsoft-Decision-1 vs SPEV](https://www.anchorterminal.com/compare/microsoft-decision-1-vs-sprag-spev.md)
- [Microsoft-Decision-1 vs Jev](https://www.anchorterminal.com/compare/microsoft-decision-1-vs-typesafe-jev.md)
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- [Drex 1.5 vs Jev](https://www.anchorterminal.com/compare/nace-drex-vs-typesafe-jev.md)
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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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- [pplx-decider vs Jev](https://www.anchorterminal.com/compare/pplx-decider-vs-typesafe-jev.md)
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