# claude-opus-5-5

> AI model available via Core.Today API.

- **Provider**: anthropic
- **Model ID**: claude-opus-5-5
- **Category**: llm_general
- **Credits**: 1 per request
- **Pricing Type**: token_based

## API Endpoint

Base URL: https://api.core.today

### Messages
POST /llm/anthropic/v1/messages

## Authentication

Header: `Authorization: Bearer YOUR_API_KEY`

Note: Your Core.Today API key (`cdt_xxx`) works as Bearer token.

## Input Parameters

- `model` (string, **required**): Model identifier. Use `claude-opus-5-5`
- `messages` (array, **required**): Array of message objects with `role` (`user`/`assistant`) and `content`
- `max_tokens` (integer, **required**): Maximum tokens to generate
- `system` (string, optional): System prompt (a top-level field, not a message role)
- `temperature` (number, optional): Sampling temperature (Range: min: 0, max: 1). Claude Opus 4.7 and later, Sonnet 5 and later, and Fable reject non-default values — omit it for those models
- `stream` (boolean, optional): Enable streaming responses (Default: `false`)

## Example Request

```json
{
  "model": "claude-opus-5-5",
  "max_tokens": 1024,
  "messages": [
    {
      "role": "user",
      "content": "Hello, how are you?"
    }
  ]
}
```

## Response Format

```json
{
  "id": "msg_abc123",
  "type": "message",
  "role": "assistant",
  "model": "claude-opus-5-5",
  "content": [
    {
      "type": "text",
      "text": "Response text here"
    }
  ],
  "stop_reason": "end_turn",
  "usage": {
    "input_tokens": 10,
    "output_tokens": 20
  }
}
```

## Usage Flow

1. POST /llm/anthropic/v1/messages with model, max_tokens and messages
2. Response is returned synchronously (or streamed if stream=true)
3. Credits are deducted based on token usage


## Token Pricing

- Input: 0.007432 credits/token
- Output: 0.03716 credits/token