anthropic/claude-sonnet-4-5

Aliases: sonnet-4.5, sonnet

$3.00

Input / 1M

$15.00

Output / 1M

200K

Context

95 t/s

Speed

Public benchmark scores

Sourced from each provider's published numbers. Verify before quoting.

Quality index

MMLU

88.7

GPQA

71.5

HumanEval

89.1

MATH

91.8

SWE-bench

Arena Elo

—

Sources: anthropic-system-card

Capabilities

toolsvisionthinkingstreamingstructured_outputprompt_cache

Input modalities: text, image

Use claude-sonnet-4-5 via Relay

Configure the model alias in YAML, then call it from Python.

YAML

# models.yaml
version: 1
models:
  sonnet-4.5:
    target: anthropic/claude-sonnet-4-5
    credential: $env.ANTHROPIC_API_KEY

Python

from relay import Hub

async with Hub.from_yaml("models.yaml") as hub:
    resp = await hub.chat(
        "sonnet-4.5",
        messages=[{"role": "user", "content": "Hello"}],
    )
    print(resp.text, resp.cost_usd)

pip install ai5labs-relay · full docs on GitHub

Compare with

vs deepseek/deepseek-chat vs xai/grok-3 vs openai/gpt-4o vs anthropic/claude-3-5-sonnet-20241022