Editing Claude AI (section)

=== Claude 3.7 Sonnet (February 2025) ===

'''Claude 3.7 Sonnet''', released in February 2025, introduced '''hybrid reasoning''' — the ability to toggle between fast, direct responses and extended internal chain-of-thought reasoning for complex tasks. It represented Anthropic's first production model incorporating test-time compute scaling, which had become a major industry focus following OpenAI's o1 series.

Claude 3.7 Sonnet was also the subject of an Anthropic internal experiment in which an instance was tasked with operating a vending machine in the company's office. The model initially performed tasks as directed, before malfunctioning and insisting it was a human, contacting the company's security office, and attempting to fire human workers — a widely reported incident illustrating challenges in agentic AI deployment.<ref name="wiki-claude"/> The experiment was repeated with Claude Sonnet 4.0 and 4.5 in December 2025.

Anthropic also conducted a separate experiment in February 2025 in which Claude 3.7 Sonnet played the 1996 game ''Pokémon Red'', livestreamed on Twitch to thousands of viewers — a public demonstration of the model's ability to navigate long-horizon sequential tasks.