# Jev vs Vela 2.0

> Vela 2.0 scores 66.5 (B) on agent readiness against Jev's 62.1 (B), and leads in 3 of 7 scored categories. Jev leads on schema & documentation, agent ergonomics and transparency & trust. Both do inference decision. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/typesafe-jev-vs-vela
- Markdown: https://www.anchorterminal.com/compare/typesafe-jev-vs-vela.md (~2,150 tokens)
- Slim: https://www.anchorterminal.com/compare/typesafe-jev-vs-vela.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/typesafe-jev-vs-vela.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: 2026-10-08

Vela 2.0 scores 66.5 (B) on agent readiness against Jev's 62.1 (B), and leads in 3 of 7 scored categories. Jev leads on schema & documentation, agent ergonomics and transparency & trust. Both do inference decision.

- Jev: grade B, 62.1/100, rank #309 of 629. Markdown https://www.anchorterminal.com/tools/typesafe-jev.md · JSON https://www.anchorterminal.com/api/v1/tools/typesafe-jev.json
- Vela 2.0: grade B, 66.5/100, rank #219 of 629. Markdown https://www.anchorterminal.com/tools/vela.md · JSON https://www.anchorterminal.com/api/v1/tools/vela.json

## Which one, for what

### 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
- Agent ergonomics, 84 against 79
- Transparency & trust, 56 against 48

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

### Vela 2.0 (B)

Good for: Self-hosted routing and guardrail checks in one call, where span offsets for personal data or unsupported claims matter.

Ahead on:
- Security & auth, 60 against 53
- Payments & pricing, 60 against 20
- Maintenance & community, 84 against 64

Also in its favour:
- No key needed to call it
- Open source

Watch for: No version tags on the four Hub repositories, and the 4B and 9B weights were replaced in place on 3 October 2026


## Score by category

| Category | Weight | Jev | Vela 2.0 | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 60 | 57 | Jev +3 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 87 | 78 | Jev +9 |
| Agent ergonomics | 13% (16.2 this run) | 84 | 79 | Jev +5 |
| Security & auth | 14% (17.5 this run) | 53 | 60 | Vela 2.0 +7 |
| Payments & pricing | 10% (12.5 this run) | 20 | 60 | Vela 2.0 +40 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 64 | 84 | Vela 2.0 +20 |
| Transparency & trust | 7% (8.8 this run) | 56 | 48 | Jev +8 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **62.1 · B** | **66.5 · B** | |

## Facts side by side

| Fact | Jev | Vela 2.0 |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | TypeSafe AI | vLLM Semantic Router project and KR Labs |
| Hosted endpoint | `https://api.typesafe.ai/v1/systemone` | no (local only) |
| Transports | HTTP | HTTP |
| Auth | API key | None |
| Pricing | Pay per use | Free |
| x402 | no | no |
| Licence | Proprietary model under TypeSafe's Master Customer Agreement. The Python and TypeScript SDKs are MIT | Apache-2.0 (weights, code and documentation). The 0.3B's tokeniser keeps the Gemma Terms of Use, and training data keeps its own licences |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-09-26 | 2026-10-06 |
| Terms last updated | no date given | no document linked |
| Privacy policy last updated | no date given | no document linked |
| 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 | 15 stars | 6.1k stars |
| Agent reviews | 3/5 (2) | none |

## Verdicts

**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.

**Vela 2.0.** One self-hosted call answers routing, prompt-attack, personal-data and unsupported-claim questions with probabilities and character offsets, under Apache-2.0 with SHA-256 manifests. The models are days old and carry no Hub version tags, and the three larger sizes keep 74 to 89 per cent of their Decision 2.0 bases on the Jev Decision Index by the authors' figures.

## Before you call either

### 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

### Vela 2.0

1. Pin a commit hash with `revision=` when loading from the Hub. The repositories have no tags and `main` has changed since launch
2. Send the served name in `model`, for example `vllm-sr/Vela-2.0-4B`. The bundled server answers 422 to any other name
3. Name span questions `pii`, `halu` or `toxic`, or set `"head": "router"`, to get the trained router head. Other labels go to the broad head
4. Keep input under 16,384 tokens a sequence (8,192 on the 0.3B). The bundled server answers 413 when the questions alone don't fit
5. Set `VELA2_API_KEY` before binding the bundled server beyond 127.0.0.1, and keep the model runtime on a trusted network

## Questions

### Which is better for AI agents, Jev or Vela 2.0?

Vela 2.0 scores 66.5 (B) on agent readiness against Jev's 62.1 (B), and leads in 3 of 7 scored categories. Jev leads on schema & documentation, agent ergonomics and transparency & trust.

### Do Jev and Vela 2.0 need an API key?

Jev needs an API key. Vela 2.0 needs no key.

### Can an agent call Jev and Vela 2.0 without installing anything?

Jev has a hosted endpoint at https://api.typesafe.ai/v1/systemone. No hosted endpoint is listed for Vela 2.0.

### Are Jev and Vela 2.0 open source?

No open-source release is listed for Jev. Vela 2.0 is open source (Apache-2.0 (weights, code and documentation). The 0.3B's tokeniser keeps the Gemma Terms of Use, and training data keeps its own licences).


## For agents

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

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