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Pareto

Text Generation • unbiased

View as MarkdownAgent setup

Model ID

Use with the Workers AI binding, the AI Gateway REST API, or the Unified API.

Calling the provider directly? Use the provider's model name instead, including with provider-native endpoints or the provider's own SDK. For example, Anthropic's name for anthropic/claude-opus-4.8 is claude-opus-4-8.

  • Third-party
  • Zero data retention

Pareto is Unbiased's blended AI model. It engages multiple language models in parallel for each request, synthesizes one answer, and supports text and vision inputs through a single API response.

Model Info
Terms and Licenselink ↗
More informationlink ↗
Zero data retentionYes
Request formatsChat Completions
Pricing
  • Input (per 1M tokens)$2.50
  • Cached input (per 1M tokens)$0.25
  • Output (per 1M tokens)$7.50

Usage

const response = await env.AI.run(
  'unbiased/pareto',
  {
    messages: [{ content: 'What is the capital of France? Answer in one word.', role: 'user' }],
    max_tokens: 16,
  },
)
console.log(response)
curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/chat/completions \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "unbiased/pareto",
  "messages": [
    {
      "content": "What is the capital of France? Answer in one word.",
      "role": "user"
    }
  ],
  "max_tokens": 16
}'
Paris
{
  "id": "chatcmpl-mu5ww8tss0mj6ofw",
  "object": "chat.completion",
  "model": "union-alpha",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Paris"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 11,
    "completion_tokens": 5,
    "total_tokens": 16,
    "prompt_tokens_details": {
      "cached_tokens": 0
    },
    "cost": 0.000045
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

Examples

System Guidance — Set a helpful system role before asking a question.
const response = await env.AI.run(
  'unbiased/pareto',
  {
    messages: [
      { content: 'You explain technical topics in plain language.', role: 'system' },
      { content: 'What is an API? Explain it in two sentences.', role: 'user' },
    ],
    max_tokens: 64,
  },
)
console.log(response)
curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/chat/completions \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "unbiased/pareto",
  "messages": [
    {
      "content": "You explain technical topics in plain language.",
      "role": "system"
    },
    {
      "content": "What is an API? Explain it in two sentences.",
      "role": "user"
    }
  ],
  "max_tokens": 64
}'
An API (Application Programming Interface) is a set of rules that lets one software program request information or actions from another. For example, a weather app uses an API to get forecasts from a weather service.
{
  "id": "chatcmpl-mu5wwcpm6hxi7lsb",
  "object": "chat.completion",
  "model": "union-alpha",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "An API (Application Programming Interface) is a set of rules that lets one software program request information or actions from another. For example, a weather app uses an API to get forecasts from a weather service."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 19,
    "completion_tokens": 45,
    "total_tokens": 64,
    "prompt_tokens_details": {
      "cached_tokens": 0
    },
    "cost": 0.000305
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}
Coding Example — Ask for a short coding example.
const response = await env.AI.run(
  'unbiased/pareto',
  {
    messages: [
      {
        content: 'Write a JavaScript function that reverses a string. Include one example call.',
        role: 'user',
      },
    ],
    max_tokens: 128,
  },
)
console.log(response)
curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/chat/completions \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "unbiased/pareto",
  "messages": [
    {
      "content": "Write a JavaScript function that reverses a string. Include one example call.",
      "role": "user"
    }
  ],
  "max_tokens": 128
}'
```javascript
function reverseString(str) {
  return Array.from(str).reverse().join("");
}

console.log(reverseString("Hello")); // "olleH"
```
{
  "id": "chatcmpl-mu5wwj1mqcjfe7xb",
  "object": "chat.completion",
  "model": "union-alpha",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "```javascript\nfunction reverseString(str) {\n  return Array.from(str).reverse().join(\"\");\n}\n\nconsole.log(reverseString(\"Hello\")); // \"olleH\"\n```"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 14,
    "completion_tokens": 37,
    "total_tokens": 51,
    "prompt_tokens_details": {
      "cached_tokens": 0
    },
    "cost": 0.00024875
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}
Follow-up Conversation — Continue a short conversation with prior assistant context.
const response = await env.AI.run(
  'unbiased/pareto',
  {
    messages: [
      { content: 'I am planning a weekend trip to a coastal city.', role: 'user' },
      {
        content: 'Consider walkable neighborhoods, local food, and a nearby beach.',
        role: 'assistant',
      },
      { content: 'What should I prioritize when choosing where to stay?', role: 'user' },
    ],
    max_tokens: 96,
  },
)
console.log(response)
curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/chat/completions \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "unbiased/pareto",
  "messages": [
    {
      "content": "I am planning a weekend trip to a coastal city.",
      "role": "user"
    },
    {
      "content": "Consider walkable neighborhoods, local food, and a nearby beach.",
      "role": "assistant"
    },
    {
      "content": "What should I prioritize when choosing where to stay?",
      "role": "user"
    }
  ],
  "max_tokens": 96
}'
For a weekend trip, **prioritize location over extra amenities**—less time in transit means more time enjoying the city.

- **Close to your main plans:** Stay near the beach for a beach-focused trip, or near restaurants and sights if you’re more interested in exploring.
- **Easy transportation:** Check airport or station connections, public transit, and parking costs if you’re driving.
- **Comfort and quiet:** Recent reviews can reveal street noise, cleanliness issues
{
  "id": "chatcmpl-mu5wwqlruoazrxij",
  "object": "chat.completion",
  "model": "union-alpha",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "For a weekend trip, **prioritize location over extra amenities**—less time in transit means more time enjoying the city.\n\n- **Close to your main plans:** Stay near the beach for a beach-focused trip, or near restaurants and sights if you’re more interested in exploring.\n- **Easy transportation:** Check airport or station connections, public transit, and parking costs if you’re driving.\n- **Comfort and quiet:** Recent reviews can reveal street noise, cleanliness issues"
      },
      "finish_reason": "length"
    }
  ],
  "usage": {
    "prompt_tokens": 43,
    "completion_tokens": 96,
    "total_tokens": 139,
    "prompt_tokens_details": {
      "cached_tokens": 0
    },
    "cost": 0.00065375
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}
Creative Writing — Generate a compact piece of creative writing.
const response = await env.AI.run(
  'unbiased/pareto',
  {
    messages: [
      { content: 'Write a four-line poem about finding light after a difficult day.', role: 'user' },
    ],
    max_tokens: 96,
  },
)
console.log(response)
curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/chat/completions \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "unbiased/pareto",
  "messages": [
    {
      "content": "Write a four-line poem about finding light after a difficult day.",
      "role": "user"
    }
  ],
  "max_tokens": 96
}'
The day lay heavy, stitched with shades of gray,
Until one star shone through the frayed dusk’s seam.
I set my burdens down beside the way,
And let its little light rekindle dream.
{
  "id": "chatcmpl-mu5wx6hq2jpgslxe",
  "object": "chat.completion",
  "model": "union-alpha",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "The day lay heavy, stitched with shades of gray,\nUntil one star shone through the frayed dusk’s seam.\nI set my burdens down beside the way,\nAnd let its little light rekindle dream."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 12,
    "completion_tokens": 46,
    "total_tokens": 58,
    "prompt_tokens_details": {
      "cached_tokens": 0
    },
    "cost": 0.0003025
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

Parameters

temperature
numberminimum: 0maximum: 2
max_tokens
numberexclusiveMinimum: 0
max_completion_tokens
numberexclusiveMinimum: 0
top_p
numberminimum: 0maximum: 1
frequency_penalty
numberminimum: -2maximum: 2
presence_penalty
numberminimum: -2maximum: 2
stream
boolean
tool_choice
response_format
reasoning_effort
stringOptional reasoning control; availability and accepted values are model-dependent.
id
string
object
string
created
number
model
string

API Schemas (Raw)

Input
Output

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