the short answer
As verified September 22, 2026, TypeSafe AI lists jev-1.13.0 as Jev’s stable model, with jev-latest and jev-preview both pointing to it. Official Python and JavaScript SDKs are public. Cloudflare lists Jev access; OpenRouter’s public model catalog did not confirm its Jev route. Jev evals and policies are live for Failproof beta users.
- Launch article
- September 15, 2026
- TypeSafe access
- Generally available; no waitlist announced
- Stable model checked
jev-1.13.0- Official SDKs
- Python and JavaScript/TypeScript
- Failproof status
- Live for beta users; contact nikita@befailproof.ai
Verified Snapshot for September 22, 2026
| Surface | Current evidence |
|---|---|
| Model | jev-1.13.0; latest and preview aliases resolve to it |
| Direct API | POST /v1/systemone with state, model and typed questions |
| Access | TypeSafe announced general availability with no waitlist |
| SDKs | typesafe-sdk for Python and @typesafe-ai/sdk for JavaScript |
| Direct price | $0.042 per million input tokens; output tokens free |
| Providers | Cloudflare verified; OpenRouter route page exists but catalog availability is unconfirmed |
| Known issues | TypeSafe publishes a version-specific 1.13 jaggedness page |
| Failproof | Jev evals and policies live for beta users |
Dated Launch and Verification Chronology
The date belongs to each observation, not just the page footer. Provider catalogs and aliases can change independently. A later reader should be able to tell which statements were checked together and which need fresh verification.
| Date | Event | Evidence status |
|---|---|---|
| September 15, 2026 | TypeSafe publishes its Jev and System One launch article | First-party announcement |
| September 22, 2026 | jev-1.13.0 verified as stable; latest and preview resolve to it | Official model page snapshot |
| September 22, 2026 | Python and JavaScript SDK repositories verified public | Official GitHub repositories |
| September 22, 2026 | Cloudflare Jev model page and Workers AI invocation verified | Provider documentation |
| September 22, 2026 | TypeSafe announces Jev general availability with no waitlist | First-party social announcement |
| September 22, 2026 | OpenRouter route page found but public model catalog has no Jev entry | Conflicting surface; availability unconfirmed |
| September 22, 2026 | Failproof confirms Jev evals and policies live for beta users | Product-owner confirmation |
Not Every Launch Signal Has the Same Evidentiary Weight
This tracker uses the strongest available source for each fact and retains qualifiers. The claim-check page separates documented facts, first-party measurements, independent results and unknowns in more detail.
| Evidence class | Supports | Does not establish |
|---|---|---|
| Official documentation | Current contract, model and stated limitations | Independent performance |
| Provider catalog | That provider’s listed route and interface | Direct-provider parity or permanence |
| Official repository | Client code, releases and license at a commit | Open model weights |
| Independent experiment | Result for the published setup | Universal superiority |
| Social field report | A claim worth investigating | Reproducibility without artifacts |
How This Tracker Handles Updates
Model aliases, provider listings, limits and prices are mutable. Every change should be verified against the owner’s page, dated and reflected here before dependent comparison pages are updated. An alias move is a behavior change for an evaluated workflow even when application code does not change.
Social posts and repositories enter the tracker as leads. They become product facts only when the product owner documents them, and become performance evidence only when the method and raw results are inspectable.
A Model Change Triggers More than a Version-Label Update
Update the model card, pricing, limitations and platform pages together when their facts change. Application teams should also replay regression tests and check production drift.
Correction Record
An earlier draft treated an OpenRouter route page as proof of current model availability. On September 22, 2026, the public OpenRouter models endpoint returned no TypeSafe or Jev entry, so the status was corrected to unconfirmed. A landing page or URL alone is insufficient when the provider catalog disagrees.
Corrections should remain visible when they affect integration choices. Record the old statement, new evidence, date and pages changed rather than silently preserving an attractive but unsupported claim.
Watch List
- New pinned Jev versions and alias movements.
- Changes to dynamic rate limits, direct price or context window.
- New official primitives, input modalities or language guidance.
- Provider launches, removals and provider-specific pricing.
- Public Failproof configuration for Jev evals and policy signals.
- Independent benchmark artifacts with released data and code.
FAQ
What is the latest Jev model?
When checked September 22, 2026, TypeSafe listed jev-1.13.0 and both current aliases pointed to it. Verify the live model page before deployment.
When did TypeSafe launch Jev?
TypeSafe’s introduction article is dated September 15, 2026.
Where can I access Jev?
TypeSafe announced general availability without a waitlist and provides a direct API and official SDKs. Cloudflare publishes a Workers AI listing. Re-check OpenRouter’s public model catalog before relying on its Jev route.
How do I access Jev support in Failproof?
Jev evals and policies are live for beta users. Email nikita@befailproof.ai to get access.
Sources
Checked against the sources below on September 22, 2026. Model versions, prices and limits change.
- TypeSafe AI: Introducing System One Models and Jev
- TypeSafe AI docs: Models
- TypeSafe AI: Official GitHub organization
- Cloudflare Workers AI: TypeSafe Jev
- OpenRouter: TypeSafe models
- TypeSafe AI on X: Jev general availability
- Failproof AI PR #570 and product-owner confirmation: Jev beta