Claude Haiku 4.5

Haiku 4.5 is the quick one. When it came out in October 2025 it matched the coding of the then-current Sonnet 4 at a third of the cost and more than twice the speed, scoring 73.3% on SWE-bench Verified. It was also the first Haiku that could think before answering and operate a computer.

Anthropic pitches it as a worker a bigger model directs — many Haikus running in parallel under one Opus — and for anything a customer waits on, like live chat. It is the oldest model in Anthropic’s current line, and that shows in what it knows.

For scale: 1,000 requests of about 3,000 tokens in and 1,000 out cost $9.20 — a long prompt and a page of answer each. Every rate is published and stays the same from one request to the next. See every model.

Use the OpenAI SDK you already have — point it at Roar AI and name the model. Read the docs.

from openai import OpenAI

client = OpenAI(base_url="https://api.roar-ai.com/v1", api_key="roar_live_…")

reply = client.chat.completions.create(
    model="claude-haiku-4-5",
    messages=[{"role": "user", "content": "Summarise this contract in plain English."}],
)