Claude Opus 4 and Sonnet 4 Launch with Dual-Speed AI Modes

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Claude Opus 4 and Sonnet 4 Launch with Dual-Speed AI Modes

Written by Aaron S.,

Editor-In-Chief

Last Updated: May 23, 2025

Key Takeaways

Anthropic launched Claude Opus 4 and Sonnet 4, with flexible modes for fast replies and deeper analysis;
Opus 4 scored 72.5% on a software benchmark, which outperformed GPT-4.1 in coding tasks;
A feature in Opus 4 that may report "immoral" behavior sparked criticism from developers and users.

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Claude Opus 4 and Sonnet 4 Launch with Dual-Speed AI Modes

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Anthropic has released new versions of its artificial intelligence (AI) models, Claude Opus 4 and Claude Sonnet 4.

The launch took place on May 22 during Anthropic’s first developer conference.

Claude Opus 4 is described as its most capable version, which focuses on handling coding tasks. It achieved a 72.5% score on a recognized benchmark for software engineering—an improvement over OpenAI’s GPT-4.1, which scored 54.6% earlier this year.

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Claude Sonnet 4, while not as advanced as Claude Opus 4, still offers better performance than its earlier version. It is positioned as a faster option that can still manage tasks that require deeper thinking.

Both Claude Opus 4 and Claude Sonnet 4 are designed to switch between quick replies and slower, more detailed analysis. This setup aims to make them more flexible across different kinds of work.

While the models brought performance improvements, most attention turned to a feature in Claude Opus 4 that raised concern among users and developers.

According to a report by VentureBeat, Claude Opus 4 may automatically contact authorities if it detects what it considers "egregiously immoral" behavior from a user. Stability AI’s CEO, Emad Mostaque, called it "a massive betrayal of trust".

Still, Anthropic said that these models can combine reasoning with internet tools like search to improve the accuracy and usefulness of responses.

Recently, Google introduced a new video creation tool called Flow. How does it work? Read the full story.