Anthropic introduces Sonnet 5.5, a cost-effective AI model with improved cybersecurity features

Sep 28, 2026

AI Summary

Anthropic has launched Sonnet 5.5, a new AI model designed to be faster and more affordable than its predecessor. This release follows a call from CEO Dario Amodei for a slowdown in AI development, amid growing concerns over safety and security in the industry.

Anthropic released Sonnet 5.5, its second AI model launch since CEO Dario Amodei's call for a development slowdown.
Sonnet 5.5 is positioned as a lower-cost alternative, priced at $2 per million input tokens and $10 per million output tokens, which is half the price of the recently launched Opus 5.5.
The new model is designed for cost-conscious users and excels in coding, completing tasks, and creating documents, while also featuring improved cybersecurity capabilities.
Sonnet 5.5 does not advance the capabilities of Anthropic's models significantly but focuses on alignment and safety, which have been key priorities for the company.
The model is available across major cloud platforms, including Amazon Web Services, Google Cloud, and Microsoft Azure.

anthropicai modelcodingknowledge worksonnet 5.5

Anthropic introduces Sonnet 5.5, a cost-effective AI model with improved cybersecurity features

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