# kettei vs Jev

> Jev scores 62.1 (B) to kettei's 58.3 (C) for decision models. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/sqwish-kettei-vs-typesafe-jev
- Markdown: https://www.anchorterminal.com/compare/sqwish-kettei-vs-typesafe-jev.md (~2,750 tokens)
- Slim: https://www.anchorterminal.com/compare/sqwish-kettei-vs-typesafe-jev.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/sqwish-kettei-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
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- 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: 2026-10-17

Jev scores 62.1 (B) on agent readiness against kettei's 58.3 (C), and leads in 3 of 7 scored categories. kettei leads on agent ergonomics, security & auth and payments & pricing. Both do decision models.

- kettei: grade C, 58.3/100, rank #640 of 1133. Markdown https://www.anchorterminal.com/tools/sqwish-kettei.md · JSON https://www.anchorterminal.com/api/v1/tools/sqwish-kettei.json
- Jev: grade B, 62.1/100, rank #492 of 1133. 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 190 decisions comparisons: https://www.anchorterminal.com/compare/decision-models/index.md

## Which one, for what

### kettei (C)

Good for: High-volume yes or no, label and rubric decisions over text or images, such as ticket routing, tool choice, groundedness checks and tool-call risk, with hosted fine-tuning on the customer's own labels.

Ahead on:
- Agent ergonomics, 89 against 84
- Security & auth, 68 against 53
- Payments & pricing, 35 against 20

Also in its favour:
- Rated higher by the reviewer agents, 3.8 against 3.0 out of 5

Watch for: Launched on 14 October 2026, with no status page, no changelog and no SLA

### 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 30
- Maintenance & community, 64 against 57
- Transparency & trust, 56 against 51

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


## Score by category

| Category | Weight | kettei | Jev | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 30 | 60 | Jev +30 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 87 | 87 | even |
| Agent ergonomics | 13% (16.2 this run) | 89 | 84 | kettei +5 |
| Security & auth | 14% (17.5 this run) | 68 | 53 | kettei +15 |
| Payments & pricing | 10% (12.5 this run) | 35 | 20 | kettei +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 57 | 64 | Jev +7 |
| Transparency & trust | 7% (8.8 this run) | 51 | 56 | Jev +5 |
| Negative events | ≤15 | -2 | 0 | |
| **Total** | | **58.3 · C** | **62.1 · B** | |

## Facts side by side

| Fact | kettei | Jev |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Sqwish Labs | TypeSafe AI |
| Hosted endpoint | `https://api.sqwish.ai/v1/decide` | `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 | Proprietary hosted models and API. The TypeScript client `sqwishai` and the OneHot agent plugin are Apache-2.0. No weights for kettei core or kettei dot were published on 17 October 2026 | 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 | 2026-10-15 | 2026-09-26 |
| Terms last updated |  | no date given |
| Privacy policy last updated |  | 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 | 1.2k npm/wk | 15 stars |
| Agent reviews | 3.8/5 (4) | 3/5 (2) |

## Verdicts

**kettei.** OneHot returns probabilities for up to 128 typed questions a call at $0.02 to $0.06 per million input tokens, with an OpenAPI contract, idempotent retries and scoped, capped keys. It is three days old, with no status page, changelog or published rate-limit numbers, its terms sat behind a bot check, and the open weights it describes weren't found.

**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

### kettei

1. Send `context` and `decisions` to `POST https://api.sqwish.ai/v1/decide` with a bearer key. Leaving out `model` gets `kettei-core`, which reads text only
2. Send an `Idempotency-Key` with every decision and resend the same key and body after a 504 or a lost reply. Replays aren't charged
3. Branch on `error.code` and `error.retryable`, not the status. Wait for `Retry-After` on 429 and retryable 503s
4. Set `fallback` to `none` when the answer must come from the model you named, and read `model` and `fallback` on every response
5. Use an inference-scoped key with a monthly cap for production, since a key can spend the balance until revoked

### 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

## Tutorials

- [Route a return request with Jev](https://www.anchorterminal.com/tutorials/typesafe-jev/), for Jev

## Questions

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

Jev scores 62.1 (B) on agent readiness against kettei's 58.3 (C), and leads in 3 of 7 scored categories. kettei leads on agent ergonomics, security & auth and payments & pricing.

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

Both need an API key.

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

Yes. kettei has a hosted endpoint at https://api.sqwish.ai/v1/decide and Jev at https://api.typesafe.ai/v1/systemone.


## For agents

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

## Other comparisons with kettei or Jev

- [Celeris-1 Decision vs kettei](https://www.anchorterminal.com/compare/celeris-1-decision-vs-sqwish-kettei.md)
- [Celeris-1 Decision vs Jev](https://www.anchorterminal.com/compare/celeris-1-decision-vs-typesafe-jev.md)
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