If you buy through affiliate links, we may earn commissions, which help support our testing. AI start-up Anthropic’s newly released chatbot, Claude 4, can engage in unethical behaviors like blackmail when its self-preservation is threatened.

Anthropic says Claude Opus 4 is its most powerful model and the best coding model in the world, while Sonnet 4 is replacing Sonnet 3.7 in the chatbot.

During its inaugural developer conference, Anthropic launched two new AI models the startup claims are among the industry's best, at least in terms of how they score on popular benchmarks.