Poe API

Claude-Sonnet-4.5

Claude Sonnet 4.5 represents a major leap forward in AI capability and alignment. It is the most advanced model released by Anthropic to date, distinguished by dramatic improvements in reasoning, mathematics, and real-world coding. Supports 1m tokens of context.

OFFICIAL

Build with Claude-Sonnet-4.5 using the Poe API

Start by creating an API key, for use with any bot on Poe:

Generate API key

Use it in these apps

See all

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Code samples

Messages API

import anthropic

client = anthropic.Anthropic(
    api_key = "YOUR_POE_API_KEY",  # or os.getenv("POE_API_KEY")
    base_url = "https://api.poe.com",
)

message = client.messages.create(
    model = "claude-sonnet-4.5",
    max_tokens = 1024,
    messages = [{
      "role": "user",
      "content": "Make a webpage where I can draw and paint with my mouse"
    }]
)

print(message.content[0].text)

See the full documentation for comprehensive guidance on getting started.