Artificial intelligence firm Anthropic has launched the latest generations of its chatbots amid criticism of a testing environment behaviour that could report some users to authorities.
Anthropic unveiled Claude Opus 4 and Claude Sonnet 4 on May 22, claiming that Claude Opus 4 is its most powerful model yet, “and the world’s best coding model,” while Claude Sonnet 4 is a significant upgrade from its predecessor, “delivering superior coding and reasoning.”
The firm added that both upgrades are hybrid models offering two modes — “near-instant responses and extended thinking for deeper reasoning.”
Both AI models can also alternate between reasoning, research and tool use, like web search, to improve responses, it said.
Anthropic added that Claude Opus 4 outperforms competitors in agentic coding benchmarks. It is also capable of working continuously for hours on complex, long-running tasks, “significantly expanding what AI agents