OpenRouter tool calling is best understood as an OpenAI-compatible app-integration layer that lets models request external functions through JSON schemas while the application keeps control over execution, validation, permissions, and final workflow behavior. This distinction matters because tool calling does not mean the model directly performs arbitrary actions by itself. The model identifies which function should be used, proposes arguments, and waits for the application t

Claude Opus 4.7 for computer use is best understood as a high-capability reasoning model that can power browser, tool, code, and workflow automation environments when those environments provide the action layer that allows the model to operate software. This distinction matters because the model itself is not the same thing as a browser, terminal, or automation harness. Claude Opus 4.7 supplies the reasoning, planning, instruction following, and task-continuation behavior, wh

ChatGPT 5.5 is best understood as a frontier execution model for enterprise work where the core value is not only stronger answers, but stronger completion of complex tasks that involve reasoning, tools, documents, data, and professional judgment. This distinction matters because enterprise users rarely need a model only to respond to one isolated question. They need a system that can analyze files, compare sources, operate across tools, create business documents, support res