Document and context handling
ChatGPT supports file and image analysis on its free plan, but buyers who regularly work with lengthy documents should examine how each alternative handles long-context input. Claude documents long-context document analysis as a core capability and pairs it with an Artifacts workspace for iterating on generated material. Perplexity and Gemini also support file analysis, though their limits depend on subscription tier. The practical question is whether the tool can ingest the full length of a typical working document and maintain coherent reference to it across a multi-turn conversation, or whether it truncates, summarizes prematurely, or resets context between messages.