While Claude Opus 4 will be limited to paying Anthropic customers, a second model, Claude Sonnet 4, will be available for both paid and free tiers of users. Opus 4 is being marketed as a powerful, large model for complex challenges, while Sonnet 4 is described as a smart, efficient model for everyday use.
Both of the new models are hybrid, meaning they can offer a swift reply or a deeper, more reasoned response depending on the nature of a request. While they calculate a response, both…
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https://www.technologyreview.com/2025/05/22/1117338/anthropics-new-hybrid-ai-model-can-work-on-tasks-autonomously-for-hours-at-a-time/