In Might, Anthropic introduced two new AI techniques, Opus 4 and Sonnet 4. Now, lower than six months later, the corporate is introducing Sonnet 4.5, and calling it the most effective coding mannequin on this planet so far. Anthropic’s foundation for that declare is a choice of benchmarks the place the brand new AI outperforms not solely its predecessor but in addition the costlier Opus 4.1 and competing techniques, together with Google’s Gemini 2.5 Professional and GPT-5 from OpenAI. As an illustration, in OSWorld, a collection that checks AI fashions on real-world laptop duties, Sonnet 4.5 set a file rating of 61.4 p.c, placing it 17 proportion factors above Opus 4.1.
On the identical time, the brand new mannequin is able to autonomously engaged on multi-step initiatives for greater than 30 hours, a big enchancment from the seven or so hours Opus 4 might preserve at launch. That is an vital milestone for the kind of agentic techniques Anthropic desires to construct.
Sonnet 4.5 outperforms Anthropic’s older fashions in coding and agentic duties.
(Anthropic)
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