Anthropic

Terminal


pip install "assertllm[anthropic]"
export ANTHROPIC_API_KEY=sk-ant-...

Usage

test_anthropic.py


from assertllm import expect, llm_test
 
@llm_test(
    expect.is_not_empty(),
    expect.contains("4"),
    provider="anthropic",
    model="claude-sonnet-4-6",
)
def test_anthropic(llm):
    llm("What is 2+2?")

Output


test_anthropic.py::test_anthropic
   "2 + 2 equals 4."
  ✓ is_not_empty()
  ✓ contains("4")
  PASSED    [0.5s]

Supported Models

Model	ID
Claude Sonnet 4	`claude-sonnet-4-20250514`
Claude Haiku 4.5	`claude-haiku-4-5-20251001`

Per-call Model Override

test_override.py


@llm_test(
    expect.is_not_empty(),
    provider="anthropic",
    model="claude-sonnet-4-6",
)
def test_override(llm):
    llm("Quick answer: 2+2?", model="claude-haiku-4-5-20251001")