# Jev compatibility

> Codiv implements the same wire API as TypeSafe's Jev, so code written for Jev runs against OpenJev with a new base URL and key.

Source: https://codiv.ai/docs/guides/jev-compatibility

## Switching

Set two environment variables. No code changes are needed:

Shell:


```bash
export TYPESAFE_API_KEY="sk-codiv-..."
export TYPESAFE_BASE_URL="https://api.codiv.ai"
```

The SDKs' default model, `jev-latest`, is accepted as an alias for `openjev-latest`.

## What is the same

- `POST /v1/systemone` and `GET /v1/models`, with the same request and response fields.
- The noul, choice and score question types and their answer shapes, including `legend` and `confidence`.
- The error shapes: validation lists on 422, and `{"detail": {"error_type", "message"}}` otherwise.
- The `x-typesafe-request-id` response header, so SDK request ids keep working.

## Differences

- A choice can have at most 128 options; Jev allows 255.
- Answers come from a different model, so probabilities will differ. Re-check any thresholds you tuned on Jev.

Codiv and OpenJev are independent projects and are not affiliated with TypeSafe AI. Jev is a model by TypeSafe AI.