What happened
Anthropic released Sonnet 5.5, its mid-tier model, claiming it is 30 percent faster than predecessor Sonnet 5 and burns tokens significantly slower, for everyday tasks like coding and office documents.
Why it matters
That speed and lower token burn mean the everyday work Sonnet 5.5 is pitched for — coding and office documents — can be done faster and for significantly less, which matters for teams running these tasks at volume.
What to watch
Anthropic also plans a new Haiku, its smallest model, in the coming weeks, though it gave no firm date.
WHO IT HITSTeams and developers who run everyday AI tasks like coding and office documents at volume.
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Anthropic's Sonnet line sits below its Opus model in power, but the company has pitched it as useful in certain circumstances because of its agility. The prior version, Sonnet 5, was announced about three months ago, and its selling point at the time was efficient agentic deployment — running agents at a lower cost than competitors. With Sonnet 5.5, the emphasis has shifted to speed.
Anthropic's benchmarks also show Sonnet 5.5 performing better than Opus 5.5 on agentic coding, likely because of its ability to spawn multiple agents without exceeding cost limits. The company says 5.5 has "comparable" cyber capabilities to Opus 5, making it the first Sonnet model subject to the same cyber safeguards that apply to Fable and Opus.
This release lands amid a flurry of new model launches from major AI labs. OpenAI released several new models just last week, including enhanced versions of Sol and Luna, and Meta announced a new model for an upcoming smart glasses feature. Anthropic's own next move appears to be a new Haiku, its smallest model, planned for the coming weeks.
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