… We cover the model, our new product updates, our evaluations, and our extensive safety testing in depth below. First impressions We build Claude with Claude. Our engineers write code with Claude Code every day, and every new model first gets tested on our own work. …
Interpretability A “diff” tool for AI: Finding behavioral differences in new models Mar 13, 2026 Read the paper Every time a new AI model is released, its developers run a suite of evaluations to measure its performance and safety. …
… The model’s capabilities are also reflected in the experiences of early customers: We're seeing state-of-the-art coding performance from Claude Sonnet 4.5 , with significant improvements on longer horizon tasks. …
… We use extended thinking for all Claude models except Sonnet 3.7 and high reasoning for GPT-5. In the revenue vs models charts, we only show models that solved at least one problem. 4 This is according to each model's Best@8 performance. …
… The models did, however, have their model-specific safety training that is, they were not the “helpful-only” versions of the models that we sometimes use in testing . …