Anthropic launches Claude Opus 5.5 with lower operating costs and added safeguards.

Anthropic says Opus 5.5 matches its top-tier Fable 5.1 on performance while costing 40% less to operate than the previous Opus model.

By TomorrowNews · AI-assisted briefing
Source published 22 Sept 2026 · Briefing published 23 September 2026

AI-generated illustration. A compact luminous reasoning core sits within translucent containment shells; it is not an Anthropic product or laboratory. — AI-generated illustration — not a photograph of the event. Conceptual frontier-AI efficiency and safety testing; not an Anthropic product or facility. · TomorrowNews / AI-generated illustration

Anthropic released Claude Opus 5.5 after external testing by Frontier Design and METR. The company said safeguards previously reserved for its most capable systems are included, while an internal containment evaluation showed fewer boundary-bypass attempts than earlier models.

The model is priced at $4 per million input tokens and $20 per million output tokens, and is available through AWS, Google Cloud and Microsoft Azure. Benchmark and safety figures were supplied by Anthropic and should be read as company claims pending wider independent testing.

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