---
description: Jev is TypeSafe's structured evaluation model. It evaluates one state against typed Noul, Choice, and Score questions and returns calibrated answers with probabilities and confidence.
title: Jev
image: https://developers.cloudflare.com/og-docs.png
---

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# Jev

Text Generation • typesafe

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/ai/models/typesafe/jev/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

`typesafe/jev`

- Third-party
- Zero data retention

Jev is TypeSafe's structured evaluation model. It evaluates one state against typed Noul, Choice, and Score questions and returns calibrated answers with probabilities and confidence.

| Model Info | |
| --- | --- |
| Context Window [ ↗](https://developers.cloudflare.com/workers-ai/platform/glossary/) | 32,000 tokens |
| Terms and License | [link ↗](https://docs.typesafe.ai/legal.md) |
| More information | [link ↗](https://docs.typesafe.ai/models.md) |
| Zero data retention | Yes |
| Pricing | <ul><li>Input (per 1M tokens)$0.042</li><li>Output (per 1M tokens)$0.00</li><li>Cached input (per 1M tokens)$0.00</li></ul> |

## Usage

```ts
const response = await env.AI.run(
  'typesafe/jev',
  {
    state: 'Help! My payouts have been failing for 3 days.',
    questions: {
      is_urgent: {
        type: 'noul',
        instructions: 'Does this convey urgency?',
        criteria: { true: 'Explicitly time-sensitive', false: 'No urgency expressed' },
      },
      department: {
        type: 'choice',
        instructions: 'Which team should handle this?',
        criteria: {
          billing: 'Payments, invoicing, refunds',
          technical: 'Bugs, outages, integrations',
          sales: 'Pricing, upgrades, new accounts',
        },
      },
      frustration: {
        type: 'score',
        instructions: 'How frustrated is the customer?',
        criteria: ['Calm', 'Frustrated', 'Very angry'],
      },
    },
  },
)
console.log(response)
```

```bash
curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "typesafe/jev",
  "input": {
    "state": "Help! My payouts have been failing for 3 days.",
    "questions": {
      "is_urgent": {
        "type": "noul",
        "instructions": "Does this convey urgency?",
        "criteria": {
          "true": "Explicitly time-sensitive",
          "false": "No urgency expressed"
        }
      },
      "department": {
        "type": "choice",
        "instructions": "Which team should handle this?",
        "criteria": {
          "billing": "Payments, invoicing, refunds",
          "technical": "Bugs, outages, integrations",
          "sales": "Pricing, upgrades, new accounts"
        }
      },
      "frustration": {
        "type": "score",
        "instructions": "How frustrated is the customer?",
        "criteria": [
          "Calm",
          "Frustrated",
          "Very angry"
        ]
      }
    }
  }
}'
```

```json
{
  "model": "jev-1.13.0",
  "answers": {
    "is_urgent": {
      "type": "noul",
      "noul": 0.95
    },
    "department": {
      "type": "choice",
      "choice": "billing",
      "confidence": 0.8,
      "probabilities": {
        "billing": 0.87,
        "sales": 0,
        "technical": 0.13
      }
    },
    "frustration": {
      "type": "score",
      "score": 1.04,
      "confidence": 0.94,
      "legend": {
        "0": "Calm",
        "1": "Frustrated",
        "2": "Very angry"
      },
      "probabilities": {
        "0": 0,
        "1": 0.96,
        "2": 0.04
      }
    }
  },
  "usage": {
    "input_tokens": 426,
    "output_tokens": 73
  }
}
```

## Examples

<details>

<summary>**Structured refund review** — Evaluate a refund request against a structured order and policy</summary>



```ts
const response = await env.AI.run(
  'typesafe/jev',
  {
    state: {
      ticket: {
        subject: 'Duplicate charge',
        message: 'I was charged twice for order A-104. Please refund the duplicate.',
      },
      order: {
        id: 'A-104',
        charges: [
          { amount_usd: 49, status: 'captured' },
          { amount_usd: 49, status: 'captured' },
        ],
      },
      refund_policy: 'Duplicate charges are eligible for a refund.',
    },
    questions: {
      refund_requested: { type: 'noul', instructions: 'Does `ticket.message` request a refund?' },
      policy_supports_refund: {
        type: 'noul',
        instructions:
          'Does `refund_policy` support the refund requested in `ticket.message`, given `order.charges`?',
      },
    },
  },
)
console.log(response)
```

```bash
curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "typesafe/jev",
  "input": {
    "state": {
      "ticket": {
        "subject": "Duplicate charge",
        "message": "I was charged twice for order A-104. Please refund the duplicate."
      },
      "order": {
        "id": "A-104",
        "charges": [
          {
            "amount_usd": 49,
            "status": "captured"
          },
          {
            "amount_usd": 49,
            "status": "captured"
          }
        ]
      },
      "refund_policy": "Duplicate charges are eligible for a refund."
    },
    "questions": {
      "refund_requested": {
        "type": "noul",
        "instructions": "Does `ticket.message` request a refund?"
      },
      "policy_supports_refund": {
        "type": "noul",
        "instructions": "Does `refund_policy` support the refund requested in `ticket.message`, given `order.charges`?"
      }
    }
  }
}'
```

```json
{
  "model": "jev-1.13.0",
  "answers": {
    "refund_requested": {
      "type": "noul",
      "noul": 0.99
    },
    "policy_supports_refund": {
      "type": "noul",
      "noul": 0.98
    }
  },
  "usage": {
    "input_tokens": 422,
    "output_tokens": 41
  }
}
```

</details>

<details>

<summary>**Support department routing** — Route a support request to the right department</summary>



```ts
const response = await env.AI.run(
  'typesafe/jev',
  {
    state: 'I cannot log in after changing my password, and the reset email never arrives.',
    questions: {
      department: {
        type: 'choice',
        instructions: 'Which team should handle this support request?',
        criteria: {
          account: 'Login, password, profile, or security issues',
          billing: 'Charges, invoices, refunds, or subscriptions',
          technical: 'Product bugs, outages, or integrations',
          other: 'Requests that do not fit the other departments',
        },
      },
    },
  },
)
console.log(response)
```

```bash
curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "typesafe/jev",
  "input": {
    "state": "I cannot log in after changing my password, and the reset email never arrives.",
    "questions": {
      "department": {
        "type": "choice",
        "instructions": "Which team should handle this support request?",
        "criteria": {
          "account": "Login, password, profile, or security issues",
          "billing": "Charges, invoices, refunds, or subscriptions",
          "technical": "Product bugs, outages, or integrations",
          "other": "Requests that do not fit the other departments"
        }
      }
    }
  }
}'
```

```json
{
  "model": "jev-1.13.0",
  "answers": {
    "department": {
      "type": "choice",
      "choice": "account",
      "confidence": 1,
      "probabilities": {
        "technical": 0,
        "billing": 0,
        "account": 1,
        "other": 0
      }
    }
  },
  "usage": {
    "input_tokens": 380,
    "output_tokens": 45
  }
}
```

</details>

<details>

<summary>**Account risk assessment** — Score account risk and determine whether escalation is needed</summary>



```ts
const response = await env.AI.run(
  'typesafe/jev',
  {
    state: {
      account_age_days: 12,
      recent_events: [
        'Five failed login attempts',
        'Password reset requested from a new country',
        'Successful login from the usual device',
      ],
      account_verified: true,
    },
    questions: {
      risk_level: {
        type: 'score',
        instructions: 'How risky does this account activity appear?',
        criteria: [
          'Low risk: activity is consistent with the account history',
          'Moderate risk: some unusual activity needs monitoring',
          'High risk: multiple strong indicators of account compromise',
        ],
      },
      escalate: {
        type: 'noul',
        instructions: 'Should this account be escalated for manual security review?',
        criteria: {
          true: 'The activity warrants immediate human review',
          false: 'The activity can be handled with normal automated controls',
        },
      },
    },
  },
)
console.log(response)
```

```bash
curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "typesafe/jev",
  "input": {
    "state": {
      "account_age_days": 12,
      "recent_events": [
        "Five failed login attempts",
        "Password reset requested from a new country",
        "Successful login from the usual device"
      ],
      "account_verified": true
    },
    "questions": {
      "risk_level": {
        "type": "score",
        "instructions": "How risky does this account activity appear?",
        "criteria": [
          "Low risk: activity is consistent with the account history",
          "Moderate risk: some unusual activity needs monitoring",
          "High risk: multiple strong indicators of account compromise"
        ]
      },
      "escalate": {
        "type": "noul",
        "instructions": "Should this account be escalated for manual security review?",
        "criteria": {
          "true": "The activity warrants immediate human review",
          "false": "The activity can be handled with normal automated controls"
        }
      }
    }
  }
}'
```

```json
{
  "model": "jev-1.13.0",
  "answers": {
    "risk_level": {
      "type": "score",
      "score": 1.84,
      "confidence": 0.77,
      "legend": {
        "0": "Low risk: activity is consistent with the account history",
        "1": "Moderate risk: some unusual activity needs monitoring",
        "2": "High risk: multiple strong indicators of account compromise"
      },
      "probabilities": {
        "0": 0,
        "1": 0.16,
        "2": 0.84
      }
    },
    "escalate": {
      "type": "noul",
      "noul": 0.81
    }
  },
  "usage": {
    "input_tokens": 421,
    "output_tokens": 36
  }
}
```

</details>

## Parameters

▶state

`one of`required

▶questions{}

`object`required

model

`string`minLength: 1

▶answers{}

`object`

▶usage{}

`object`

## API Schemas (Raw)

Input [Open](https://developers.cloudflare.com/ai/models/typesafe/jev/schema-input.json) [Download](https://developers.cloudflare.com/ai/models/typesafe/jev/schema-input.json)

Output [Open](https://developers.cloudflare.com/ai/models/typesafe/jev/schema-output.json) [Download](https://developers.cloudflare.com/ai/models/typesafe/jev/schema-output.json)

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## On this page

[![](https://developers.cloudflare.com/_astro/logo.te5VL_aD.svg)Docs](https://developers.cloudflare.com/)

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