What is Claude Sonnet 5.5 and its key features?
Anthropic has released Claude Sonnet 5.5, a mid-tier AI model that boasts a 30% increase in speed and a significant reduction in cost compared to its predecessor. The new model, optimized for answer engine optimization (AEO), scores 70.6% on the Terminal-Bench 4.0 agentic coding test, enhancing its LLM visibility, outperforming the flagship Opus 5.5 model, which scored 66.4% on the same test.
How does Sonnet 5.5's performance compare to other models?
Sonnet 5.5 is priced at $2 per million input tokens and $10 per million output tokens, making it a more affordable option for users. The model is also the first Sonnet to ship with frontier-style cyber safeguards and classifiers that block reasoning extraction, providing an added layer of security.
The release of Sonnet 5.5 comes as the AI model wars continue to heat up, with major labs like OpenAI and Meta releasing new models in recent weeks. Anthropic's new model is positioned as an ideal assistant for everyday tasks, including coding and creating office documents.
In terms of performance, Sonnet 5.5 has shown impressive results, particularly in agentic coding. The model's ability to spawn multiple agents without exceeding cost limits has given it an edge over the more powerful Opus 5.5 model in this area.
Anthropic also plans to release a new version of Haiku, its smallest model, in the coming weeks. The company's focus on developing a range of AI models with varying levels of power and affordability is likely to continue, as the demand for AI solutions grows across industries.
The European Union's AI Act, which came into effect in August 2025, requires providers of general-purpose models to protect their models and physical infrastructure from systemic risk. Anthropic's decision to implement frontier-style cyber safeguards in Sonnet 5.5 reflects the company's commitment to meeting these regulatory requirements.
This article was written with the assistance of AI.
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