Anthropic launches Sonnet 5.5, emphasizing speed and cost efficiency

Sep 28, 2026

AI Summary

Anthropic has introduced Sonnet 5.5, a faster and more cost-effective version of its mid-tier AI model. The new model is designed for everyday tasks and is reported to be 30% quicker than its predecessor, Sonnet 5, while also offering robust cyber capabilities.

Anthropic released Sonnet 5.5, a mid-tier AI model that is faster and cheaper than Sonnet 5.
Sonnet 5.5 is claimed to be 30% faster than its predecessor and has a slower token burn rate.
The model is positioned as an ideal assistant for tasks like coding and document creation.
Sonnet 5.5 is less powerful than the Opus model but is noted for its agility and better performance in agentic coding.
It is the first Sonnet model to be subject to the same cyber safeguards as the Fable and Opus models.
Anthropic plans to release a new version of its smallest model, Haiku, in the coming weeks.
The AI industry has seen numerous model releases recently, including updates from OpenAI and Meta.

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Anthropic launches Sonnet 5.5, emphasizing speed and cost efficiency

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