# Jev Latest

Jev Latest is TypeSafe AI's rolling alias for the newest stable release of Jev, the System One decision model that answers typed yes/no, choice, and score questions with calibrated probabilities and confidence. Use it to stay on the current model automatically; the response reports the version that actually answered. Its published context window is 32,000 tokens. The advertised input rate is $0.042 per million input tokens. The advertised output rate is $0.00 per million output tokens.

- Model identifier: ` typesafe-ai/jev-latest `
- Creator: TypeSafe AI
- Providers: TypeSafe AI
- Model type: Evaluation
- Canonical model page: [Jev Latest](<https://impossibl.com/typesafe-ai/jev-latest>)
- API availability: Listed as serving through Impossibl.
- Creator release date: 2026-09-15

## Providers

TypeSafe AI hosts Jev Latest. Impossibl routes your request intelligently and handles failover automatically when a provider is down.

| Provider | Endpoint location | Routes | Verified context window | Tool calling |
| --- | --- | --- | --- | --- |
| TypeSafe AI | Not specified | 1 | Not verified | Not supported |

The model price applies whichever provider serves the request. Endpoint locations do not guarantee inference residency.

## Specs and Capabilities

- Context window: 32,000 tokens
- Maximum output tokens: Not published in the public catalog; this is separate from the context window.
- Inputs: text
- Outputs: typed answers with probabilities
- Tool calling: Not supported

## API access

Use ` typesafe-ai/jev-latest ` as the model identifier through the Impossibl API.

Published API endpoints:

- ` /v1/systemone `

[API quickstart](<https://impossibl.com/docs/agent-quickstart>) · [Models and billing documentation](<https://impossibl.com/docs/models>)

## Published API prices

All rates are in USD. An unpublished rate is unknown, not zero. Workspace-specific pricing, taxes, balance-purchase fees, billing adjustments, and tool charges can affect the amount paid.

| Usage | Published base rate | Billing unit |
| --- | --- | --- |
| Input | $0.042 | per million input tokens |
| Output | $0.00 | per million output tokens |
| Cache read | Not published | per million cached input tokens |
| Cache write (default retention) | Not published | per million tokens |
| Cache write (one-hour retention) | Not published | per million tokens |
| Audio input | Not published | per million audio input tokens |

## Availability and retirement

The model is listed as serving. No retirement is announced in the current public catalog.

## Frequently asked questions

### What is Jev Latest?

Jev Latest is TypeSafe AI's rolling alias for the newest stable release of Jev, the System One decision model that answers typed yes/no, choice, and score questions with calibrated probabilities and confidence. Use it to stay on the current model automatically; the response reports the version that actually answered.

Sources: [TypeSafe AI models and aliases](<https://docs.typesafe.ai/models>); [Introducing System One models and Jev](<https://typesafe.ai/blog/introducing-system-one-models-and-jev>)

### How much does Jev Latest cost?

Jev Latest costs $0.042 per million input tokens and $0.00 per million output tokens through the Impossibl API. All rates are in USD.

### What is the context length of Jev Latest?

Jev Latest has a 32,000-token context window through the Impossibl API.

### Does Jev Latest support tool calling?

No. Jev Latest does not support tool calling through the Impossibl API.

### What inputs and outputs does Jev Latest support?

Jev Latest accepts text as input. Jev Latest returns typed answers with probabilities.

### How do I use Jev Latest through an API?

Jev Latest is available through the Impossibl API. Use typesafe-ai/jev-latest as the model identifier with /v1/systemone. The quickstart explains how to create an API key and send your first request.

### When was Jev Latest released?

TypeSafe AI released Jev Latest on September 15, 2026.

Sources: [Creator release announcement](<https://typesafe.ai/blog/introducing-system-one-models-and-jev>)

## Sources and related links

Prices, limits, capabilities, endpoints, and availability come from the public Impossibl catalog. Creator documentation supplies descriptions and release dates where available; it does not override the published API offering.

- [Public Impossibl model catalog](<https://api.impossibl.com/v1/models>)
- [Full model directory as JSON](<https://impossibl.com/models.json>)
- [Jev Latest: model details and pricing](<https://impossibl.com/typesafe-ai/jev-latest>)
- [Model directory](<https://impossibl.com/models>)
- [TypeSafe AI models and aliases](<https://docs.typesafe.ai/models>)
- [Introducing System One models and Jev](<https://typesafe.ai/blog/introducing-system-one-models-and-jev>)