Claude Sonnet 4.5

Authentication

authorization string required

All APIs require authentication via Bearer Token.

Get API Key:

Visit API Key Management Page to get your API Key

Usage:

Add to request header:

Authorization: Bearer YOUR_API_KEY

Parameters

model string required

Model ID to use for the request.

Value: vtrix-claude-sonnet-4.5

---

messages array required

Array of message objects representing the conversation history.

role string required

Message role.

Options: user, assistant, system, developer

content string | array required

Text string or multimodal array.

---

max_tokens integer

Maximum tokens to generate in the completion.

Range: 1 - 64000

---

temperature number

Sampling temperature to use.

Default: 1.0

Range: 0.0 - 2.0

---

top_p number

Nucleus sampling parameter.

Default: 1.0

Range: 0.0 - 1.0

---

stream boolean

Whether to stream response incrementally.

Default: false

Error Codes

Code	Name	Description
401	Unauthorized	API key is missing or invalid
403	Forbidden	Insufficient balance or permission denied
429	Too Many Requests	Rate limit exceeded
500	Internal Server Error	An internal server error occurred