Claude 4 AI Models Launch

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What’s Improved in AI Models Sonnet & Opus

What's New in Anthropic's Claude 4 Gen AI Models?

The latest versions of Anthropic's Claude generative AI models made their debut Thursday, including a heavier-duty model built specifically for coding and complex tasks.

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Anthropic’s new Claude 4 AI models can reason over many steps

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

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Claude 4 Debuts with Two New Models Focused on Coding and Reasoning

Claude Opus 4 is designed for coding among other tasks, and it offers sustained performance for complex, long-running tasks and agent workflows.

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

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

New Claude 4 AI model refactored code for 7 hours straight

In particular, that marathon refactoring claim reportedly comes from Rakuten, a Japanese tech services conglomerate that "validated [Claude's] capabilities with a demanding open-source refactor running independently for 7 hours with sustained performance," Anthropic said in a news release.

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

Anthropic's most powerful model yet, Claude 4, has unwanted side effects: The AI can report you to authorities and the press.

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

The company said it was taking the measures as a precaution and that the team had not yet determined if its newst model has crossed the benchmark that would require that protection.