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Overview

The basic Anthropic demo mirrors the OpenAI demo but uses Claude models. It tries common Anthropic model IDs in order until one succeeds. Use it to confirm your ANTHROPIC_API_KEY is valid.

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Prerequisites

  • ANTHROPIC_API_KEY set in your environment
  • Python 3.12+
  • icrl-py installed

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Run

uv run python examples/basic_anthropic_demo.py
Optional model override (tried first if set): 
MODEL=claude-sonnet-4-5 uv run python examples/basic_anthropic_demo.py

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Model Fallback

If MODEL is not set, the script tries these in order:
  1. claude-sonnet-4-5
  2. claude-sonnet-4
  3. claude-3-7-sonnet-latest
  4. claude-3-5-sonnet-latest
It stops on the first model that succeeds.

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Expected Output

Model: claude-sonnet-4-5
Success: True
Steps: 1

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Source

examples/basic_anthropic_demo.py — about 80 lines, including model fallback logic.