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Anthropic launches Claude Opus 4

Anthropic's new Claude Opus 4 can run autonomously for seven hours straight

Claude Opus is Anthropic's largest version of the model family with more power for longer, complex tasks, whereas Sonnet is generally speedier and more efficient. Claude Opus 4 is

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Anthropic Releases Claude 4: What’s Improved in AI Models Sonnet & Opus

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Anthropic’s Claude Opus 4 model can work autonomously for nearly a full workday

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Anthropic adds Claude 4 security measures to limit risk of users developing weapons

The company said the move is meant "to limit the risk of Claude being misused specifically for the development or acquisition of chemical, biological, radiological, and nuclear (CBRN) weapons."

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Claude 4 AI will try to report you to authorities if it thinks you’re doing shady stuff

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Anthropic’s Promises Its New Claude AI Models Are Less Likely to Try to Deceive You

Anthropic faces backlash to Claude 4 Opus behavior that contacts authorities, press if it thinks you’re doing something ‘egregiously immoral’

Bowman later edited his tweet and the following one in a thread to read as follows, but it still didn't convince the naysayers.

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Anthropic's Claude Opus 4 runs nonstop for over six hours with mind-blowing stamina

Anthropic has its own news to offer following a hectic week filled with announcements from Google and OpenAI. Anthropic unveiled its newest generation of models, Claude Opus 4 and Claude Sonnet 4, on Thursday.

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Early Impressions of Claude Opus 4 and Using Tools with Extended Thinking

I’ve been testing an early access version of Claude Opus 4, the latest model by Anthropic that was just announced today. You can read more about the model in the official blog post and find additional documentation here.

Anthropic overtakes OpenAI: Claude Opus 4 codes seven hours nonstop, sets record SWE-Bench score and reshapes enterprise AI

Anthropic's Claude Opus 4 outperforms OpenAI's GPT-4.1 with unprecedented seven-hour autonomous coding sessions and record-breaking 72.5% SWE-bench score, transforming AI from quick-response tool to day-long collaborator.

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AI system resorts to blackmail when its developers try to replace it

Anthropic says its AI model Claude Opus 4 resorted to blackmail when it thought an engineer tasked with replacing it was having an extramarital affair.

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