> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfy.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Use Claude Opus 5.5 with Comfy Router

> Call anthropic/claude-opus-5-5 through Comfy Router: endpoint, request shape and the response Router returns.

API Reference for `anthropic/claude-opus-5-5`, served by Comfy Router from Anthropic.

**Input:** Text, Image · **Output:** Text

## Quick start

Create a key in [your Comfy workspace](https://platform.comfy.org/profile/api-keys?onboarding=router) and export it as `COMFY_API_KEY`. The Python and TypeScript snippets use the Comfy SDKs (`pip install comfy-sdk` and `npm install @comfyorg/sdk`); the cURL snippet is the same call over raw HTTP.

**Model ID:** `anthropic/claude-opus-5-5`

**Endpoint:** `POST https://api.comfy.org/v2/models/anthropic/claude-opus-5-5`

**Wait for the result**

```python Python theme={null}
from comfy_sdk import Comfy

# Reads COMFY_API_KEY from the environment.
# The SDK automatically creates an idempotency key and reuses it for automatic retries.
with Comfy() as client:
    result = client.models.run(
        "anthropic/claude-opus-5-5",
        {
            "max_tokens": 16,
            "messages": [
                {
                    "content": "Reply with the single word: ok",
                    "role": "user",
                },
            ],
        },
    )

print(result)
```

```typescript TypeScript theme={null}
import { comfy } from "@comfyorg/sdk";

// Reads COMFY_API_KEY from the environment.
// The SDK automatically creates an idempotency key and reuses it for automatic retries.
const { data } = await comfy.models.run("anthropic/claude-opus-5-5", {
  max_tokens: 16,
  messages: [
    {
      content: "Reply with the single word: ok",
      role: "user",
    },
  ],
});

console.log(data);
```

```bash cURL theme={null}
curl https://api.comfy.org/v2/models/anthropic/claude-opus-5-5 \
  -H "X-API-Key: $COMFY_API_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d "{\"max_tokens\": 16, \"messages\": [{\"content\":\"Reply with the single word: ok\",\"role\":\"user\"}]}"
```

**Queue and collect later**

The same body, sent to `POST https://api.comfy.org/v2/models/anthropic/claude-opus-5-5/requests`. Router answers `201` with a `request_id` as soon as the run is admitted, and the result is collected once it is ready, from this process or another one. [Queued delivery](https://docs.comfy.org/development/comfy-router/queue.md) walks through status, cancellation and collection.

```python Python theme={null}
import asyncio
from comfy_sdk import AsyncComfy

# Reads COMFY_API_KEY from the environment.
# Each submit() call mints its own Idempotency-Key and reuses it for automatic retries.
async def main():
    async with AsyncComfy() as client:
        handle = await client.models.submit(
            "anthropic/claude-opus-5-5",
            {
                "max_tokens": 16,
                "messages": [
                    {
                        "content": "Reply with the single word: ok",
                        "role": "user",
                    },
                ],
            },
        )
        print("request_id:", handle.request_id)  # with the model ID, all another process needs

        # Poll until the request completes, waiting the Retry-After the server names.
        async for update in handle.iter_events():
            print(update.status, update.queue_position)

        # The provider's own payload, the same value models.run() returns.
        # A request that failed or was cancelled raises the typed Router error here.
        result = await handle.get()

    print(result)

asyncio.run(main())
```

```typescript TypeScript theme={null}
import { comfy } from "@comfyorg/sdk";

// Reads COMFY_API_KEY from the environment.
// Each submit() call mints its own Idempotency-Key and reuses it for automatic retries.
const handle = await comfy.models.submit("anthropic/claude-opus-5-5", {
  max_tokens: 16,
  messages: [
    {
      content: "Reply with the single word: ok",
      role: "user",
    },
  ],
});
console.log("requestId:", handle.requestId); // with the model ID, all another process needs

// Poll until the request completes, waiting the Retry-After the server names.
for await (const update of handle.events()) {
  console.log(update.status, update.queuePosition);
}

// The same result models.run() returns. A request that failed or was cancelled rejects here.
const result = await handle.get();

console.log(result.data);
```

```bash cURL theme={null}
# 1. Submit. Router answers 201 with request_id, status_url, response_url and cancel_url.
curl https://api.comfy.org/v2/models/anthropic/claude-opus-5-5/requests \
  -H "X-API-Key: $COMFY_API_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d "{\"max_tokens\": 16, \"messages\": [{\"content\":\"Reply with the single word: ok\",\"role\":\"user\"}]}"

# 2. Poll until status is COMPLETED, waiting the Retry-After seconds each response names.
REQUEST_ID="<request_id from the 201 body>"
curl -i https://api.comfy.org/v2/models/anthropic/claude-opus-5-5/requests/$REQUEST_ID/status \
  -H "X-API-Key: $COMFY_API_KEY"

# 3. Collect. 200 with the model's native output, 202 with the status body while it is still running.
curl https://api.comfy.org/v2/models/anthropic/claude-opus-5-5/requests/$REQUEST_ID \
  -H "X-API-Key: $COMFY_API_KEY"
```

## Schema

### Input

**max\_tokens** `integer` *required*

Maximum number of tokens to generate before stopping.

**messages** `object[]` *required*

Conversation turns. See Anthropic Messages API docs for the full content-block taxonomy.

**messages\[].content** `object` *required*

Either a string shorthand or an array of content blocks (text, image, document, tool\_use, tool\_result, ...).

**messages\[].role** `string` *required*

Possible values: `user`, `assistant`

**model** `string`

Anthropic model identifier (e.g. `claude-sonnet-4-5`, `claude-opus-4-7`).

**stream** `boolean`

When true, the response is a `text/event-stream` of Anthropic message events instead of a single JSON body.

**system** `object`

Top-level system prompt. Either a string or an array of content blocks; both reach Anthropic unchanged.

Generated from the schema Router serves at `GET /v2/models/anthropic/claude-opus-5-5/openapi.json`, the same document it validates a call against before the request reaches the provider.

### Output

**id** `string`

**model** `string`

**role** `string`

**stop\_reason** `string`

**stop\_sequence** `string`

**type** `string`

**usage** `object`

Token usage for an Anthropic Messages API call.

**usage.cache\_creation** `object`

Per-TTL breakdown of cache-write input tokens for an Anthropic Messages API call.

**usage.cache\_creation.ephemeral\_1h\_input\_tokens** `integer`

**usage.cache\_creation.ephemeral\_5m\_input\_tokens** `integer`

**usage.cache\_creation\_input\_tokens** `integer`

**usage.cache\_read\_input\_tokens** `integer`

**usage.input\_tokens** `integer`

**usage.output\_tokens** `integer`

**content** `object[]` *required*

The reply's content blocks, in order. Present on every completed message; empty when the turn produced nothing.

**content\[].text** `string`

The block's text. Present on `text` blocks and absent on every other kind.

**content\[].type** `string`

The block kind. `text` is the one that carries `text`; `thinking`, `redacted_thinking`, `tool_use`, `server_tool_use` and the tool-result blocks are the others Anthropic sends today, and the list is open.

## Examples

### Input

```json theme={null}
{
  "max_tokens": 16,
  "messages": [
    {
      "content": "Reply with the single word: ok",
      "role": "user"
    }
  ]
}
```

### Output

```json theme={null}
{
  "content": [
    {
      "text": "ok",
      "type": "text"
    }
  ],
  "id": "msg_01ExampleInvalidPlaceholder",
  "model": "claude-opus-5-5",
  "role": "assistant",
  "stop_reason": "end_turn",
  "stop_sequence": null,
  "type": "message",
  "usage": {
    "input_tokens": 16,
    "output_tokens": 3
  }
}
```

## Before you ship

The SDKs create an `Idempotency-Key` and reuse it for automatic retries. For manual retries, reuse the original key. Router can hold the connection for up to 10 minutes.

When a request fails, Router sends an `X-Comfy-Error-Type` response header explaining why. A `422` means Router rejected the input before calling the provider, and a `413` means the request body was larger than Router accepts. Download generated assets promptly because [result URLs can expire](https://docs.comfy.org/development/comfy-router/reference.md#result-assets).

Any size limit named in a field description above is the provider's own bound on that field, quoted from the provider's specification. Router applies a separate cap to the whole request body, which base64-encoded media counts against: see [request body size](https://docs.comfy.org/development/comfy-router/limitations.md#request-bodies-are-capped).

This page documents one partner model called through Comfy Router. The same `comfy-sdk` / `@comfyorg/sdk` package also ships a second client, for running a whole ComfyUI workflow graph on Comfy Cloud: `Comfy(api_key=...)` / `new Comfy({ apiKey })`, with `client.workflows`, `client.assets` and `client.jobs`. See [Comfy SDKs](https://docs.comfy.org/development/api-development/sdks.md).

> **[Headers](https://docs.comfy.org/development/comfy-router/headers.md)**
>
> Authentication, idempotency, request IDs, error buckets, retry pacing, spend limits.

> **[Using the Router API](https://docs.comfy.org/development/comfy-router/api.md)**
>
> Model discovery, validation errors, retries, and billing.

> **[Limitations](https://docs.comfy.org/development/comfy-router/limitations.md)**
>
> What Router does not do today, and what to use instead.


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.