---
title: "OpenRouter / Chat completion"
description: "OpenRouter tool openrouter-chat on looot: input fields, $0.000006 per result, output shape, and code to run it with curl, JavaScript or Python."
sidebar:
  hidden: true
---

{/* Generated by scripts/generate-api-reference.mjs from data/api-reference.json. Do not edit. */}

Runs a chat completion on one of 15 current models (OpenAI GPT-6 Luna and GPT-5.4, Gemini 3.8 Flash, DeepSeek v4, Qwen 3.8, GLM 5.3, Kimi K2.6, Mistral Small, Grok). messages is the usual [\{role, content\}] list; max_tokens (1-16000) is required and caps the answer (reasoning tokens count toward it). Returns choices[0].message.content and usage with the exact cost. OpenAI-compatible request and response.

- **Tool id:** `openrouter-chat`
- **Provider:** [OpenRouter](/providers/openrouter)
- **Job:** [Completion llm chat](/reference/jobs/llm-chat-completion) (`llm.chat.completion`)
- **Price:** $0.000006 per result. A call that fails at the provider costs $0.

## Inputs

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `max_tokens` | integer | yes |   |
| `messages` | array | yes |   |
| `model` | string | yes |   |
| `response_format` | object | no | e.g. \{"type":"json_object"\} or a json_schema |
| `seed` | integer | no |   |
| `stop` | array | no |   |
| `temperature` | number | no |   |
| `top_p` | number | no |   |

## Output

The run's `result` holds the provider's answer. Signed in, `looot inspect openrouter-chat` prints its fields.

## Run it

Every call needs your API token in `LOOOT_TOKEN`; [Sign in](/get-started/sign-in#use-the-token-in-scripts-and-agents) shows how to get one. Each run also needs a new idempotency key, so a retry never pays twice. With `wait: 30` the answer comes back inline when the run ends within 30 seconds. Otherwise you get the running run back: poll `GET /v1/runs/<runId>`.

Example input with placeholder values:

<CodeGroup>

```bash curl
curl -X POST "https://api.looot.ai/v1/runs" \
  -H "Authorization: Bearer $LOOOT_TOKEN" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{"endpointId":"openrouter-chat","input":{"model":"<model>","messages":[],"max_tokens":1},"wait":30}'
```

```js JavaScript
const response = await fetch("https://api.looot.ai/v1/runs", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.LOOOT_TOKEN}`,
    "Content-Type": "application/json",
    "Idempotency-Key": crypto.randomUUID(),
  },
  body: JSON.stringify({
    endpointId: "openrouter-chat",
    input: {
      model: "<model>",
      messages: [],
      max_tokens: 1,
    },
    wait: 30,
  }),
});
const run = await response.json();
console.log(run.status, run.result);
```

```python Python
import os
import uuid

import requests

response = requests.post(
    "https://api.looot.ai/v1/runs",
    headers={
        "Authorization": f"Bearer {os.environ['LOOOT_TOKEN']}",
        "Idempotency-Key": str(uuid.uuid4()),
    },
    json={
        "endpointId": "openrouter-chat",
        "input": {
            "model": "<model>",
            "messages": [],
            "max_tokens": 1,
        },
        "wait": 30,
    },
    timeout=90,
)
run = response.json()
print(run["status"], run.get("result"))
```

</CodeGroup>

To let looot pick among every provider of this job instead, send `job:llm.chat.completion` as `endpointId`; see [the job page](/reference/jobs/llm-chat-completion).