> The latest Anthropic and OpenAI models excel in both domains.

Is that because OpenAI models are not a single model but a cluster of models which specialize different domains?

By domain, I really meant "tool calling" and "one-shot fluid intelligence"

Anthropic models were the original leaders in tool calling and agentic work, even when other models felt significantly smarter in (Claude Sonnet 3.5 vs Gemini 2.5 Pro, for example). OpenAI models were the opposite, starting smart (more correct solutions on the first try) and got better at exploring and iterating with tools in 2026. The latest releases (Opus 4.5+ and GPT 5.4+) excel at both.