GPT-5 is the platform leader. Reasoning quality is a hair behind Claude Opus 4.7 on hard problems but tool-use reliability is the best in the category, and the ecosystem (assistants API, file search, code interpreter, vision) is unmatched.
For any application where the model needs to call tools, browse, or work with files, GPT-5 is the safe pick. For pure reasoning on dense text, Claude often wins.
Price is slightly cheaper than Claude per token, but context window is shorter (400K vs 1M).
Verdict: the platform pick. 9.3/10.