Claude Opus 5.5

Opus 5.5 replaced Opus 5 in September 2026 and is the model Anthropic tells most people to start with. Anthropic puts it at about 40% cheaper than its predecessor on typical work and more than 30% faster at writing its answer. On professional knowledge work it scored higher than Fable 5.1 in Anthropic’s own GDPval-AA test — 1846 against 1735 — and it reached 66.4% on Terminal-Bench 4.0.

Thinking is always on, at medium effort by default. For long coding sessions, reviewing a large codebase and business analysis it is the safe high-end choice; Fable 5.1 is only worth the extra on problems Opus cannot crack.

For scale: 1,000 requests of about 3,000 tokens in and 1,000 out cost $36.80 — 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.

Claude Opus 5.5 is billed in rupees, on the same monthly invoice as every other model your team uses — no foreign card, no separate Anthropic account, and one key for all of it.

Prompts sent to Claude Opus 5.5 are processed outside Sri Lanka. If a workload has to stay in the country, Qwen3.8-27B (Colombo) runs on our own servers in Colombo.

Anthropic describes its current models as multilingual but publishes no Sinhala or Tamil results. Test it on your own Sinhala and Tamil messages before relying on it for them.

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