Anthropic’s AI model Claude shows different behavioural tendencies depending on the model version and the language used, a study found. Anthropic analysed 309,815 anonymised user conversations, focusing on subjective exchanges such as advice and feedback. It mapped more than 3,300 values onto four behavioural axes and controlled for task and topic. Results showed clear differences across models and languages. Anthropic said the differences do not indicate Claude’s own values and the causes remain unclear.

Anthropic on Monday unveiled its mid-range model Claude Sonnet 5. The company said Sonnet 5 offers performance close to Opus 4.8 while being cheaper to use, and it is available as the default model for Claude Free and Pro plans and across all subscription tiers. Pricing through Aug. 31 is $2 per 1 million input tokens and $10 per 1 million output tokens.