Anthropic has released Claude Sonnet 5.5, a new version of its mid-range AI model that the company says is faster and cheaper to run than Sonnet 5. The model, launched on 28 September 2026, is aimed at coding, document creation and spreadsheet work, and is expected to appear across Anthropic’s products and developer tools.

Pricing remains unchanged from Sonnet 5 at $2 per million input tokens and $10 per million output tokens, according to Reuters. The release is the second model in the 5.5 generation as Anthropic builds towards a potential public listing.

The company says the new model delivers stronger benchmark performance while keeping costs down for high-volume users. The launch comes amid an intense race among AI labs, with OpenAI, Google and others rolling out new models at a rapid pace. Developers and businesses are watching closely, as model pricing and speed directly affect the cost of building AI-powered applications. Anthropic has positioned Sonnet 5.5 as the workhorse option for everyday professional tasks.