OpenAI Compatibility

Claudexia provides an OpenAI-compatible /v1/chat/completions endpoint, allowing you to use the OpenAI SDK or any OpenAI-compatible client with Claude models.

Endpoint

http

POST https://api.claudexia.tech/v1/chat/completions

Authentication

Use the standard Authorization: Bearer header:

http

Authorization: Bearer sk_cdx_YOUR_KEY

Request Body

Parameter	Type	Required	Description
`model`	string	Yes	Model ID (e.g. claude-sonnet-4-20250514).
`messages`	array	Yes	Array of messages with role ("system", "user", "assistant") and content.
`temperature`	number	No	Sampling temperature (0–1).
`max_tokens`	integer	No	Maximum tokens to generate.
`stream`	boolean	No	Enable streaming via SSE.

Field Mapping

Claudexia automatically maps between OpenAI and Anthropic formats:

OpenAI Field	Anthropic Equivalent	Notes
`messages[role="system"]`	`system`	System messages are extracted and sent as the system parameter.
`max_tokens`	`max_tokens`	Direct mapping.
`temperature`	`temperature`	Direct mapping.
`stop`	`stop_sequences`	Accepts string or array.
`choices[0].message`	`content`	Response content is wrapped in OpenAI format.
`choices[0].finish_reason`	`stop_reason`	end_turn → stop, max_tokens → length.

cURL Example

bash

curl https://api.claudexia.tech/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk_cdx_YOUR_KEY" \
  -d '{
    "model": "claude-sonnet-4.5",
    "max_tokens": 1024,
    "messages": [
      {"role": "system", "content": "You are a helpful assistant."},
      {"role": "user", "content": "Hello!"}
    ]
  }'

Python Example (OpenAI SDK)

python

from openai import OpenAI

client = OpenAI(
    api_key="sk_cdx_YOUR_KEY",
    base_url="https://api.claudexia.tech/v1",
)

response = client.chat.completions.create(
    model="claude-sonnet-4.5",
    max_tokens=1024,
    messages=[
        {"role": "system", "content": "You are a helpful assistant."},
        {"role": "user", "content": "Explain quantum computing in one paragraph."},
    ],
)

print(response.choices[0].message.content)

Models

Cursor IDE