Claude Sonnet 5.5 API in Australia

In Australian dollars, the currency your card is charged in, with the published US dollar rate beside each.

For scale: 1,000 requests of about 3,000 tokens in and 1,000 out cost A$24.23 — 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.

Prices are our published US dollar rates converted at A$1.47 to the dollar, our rate for October — the same rate your card is charged.

Sonnet 5.5 is the Claude to try first for everyday coding and documents. It arrived at the end of September 2026 with the biggest jump Anthropic has shown this year: on Terminal-Bench 4.0 it went from 10.3% for Sonnet 5 to 70.6%, ahead of Opus 5.5’s 66.4%. On professional knowledge work it scored 1844 in Anthropic’s GDPval-AA test, two points behind Opus 5.5.

It sits a price tier below Opus, and Anthropic says it runs more than 30% faster than Sonnet 5. Thinking is on by default and can be dialled back. Where it gives way to Opus is open-ended work that needs sustained judgement over a long stretch — Anthropic says so itself.

• Everyday coding, bug fixing and command-line agents.
• Writing documents, slides and spreadsheets.
• High-volume agent work where Opus is too slow or too costly.
• A first choice for most new products.

• For long, open-ended work that needs judgement throughout, Anthropic says Opus 5.5 is clearly stronger.
• Released on 28 September 2026, so there are fewer worked examples and community notes than for older models.
• Some microbiology and virology requests may be wrongly flagged by Anthropic’s safety filters.

Roar AI provides access to Claude Sonnet 5.5 through the Roar AI gateway, charged in Australian dollars on one bill with every other model. Requests from Australia go through our gateway in Singapore today; a gateway in Sydney is coming. Developers can use Claude Sonnet 5.5 alongside other supported models without a separate integration for every provider.

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-sonnet-5-5",
    messages=[{"role": "user", "content": "Summarise this contract in plain English."}],
)

Claude Sonnet 5.5 is a frontier model, and requests are processed on international infrastructure, outside Australia. The model directory says where each model is processed.

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Every Claude model: Claude API. Explore all AI models available in Australia