File upload capability is one of the most underestimated constraints in professional AI workflows, because it determines not only what can be analyzed , but also how work must be structured , how often context must be rebuilt , and where hidden bottlenecks emerge  in real usage. The comparison between Gemini 3  and ChatGPT 5.2  reveals two very different philosophies in how file ingestion, format handling, and scale limits are designed and exposed to users. ····· File upload

DeepSeek provides file uploading capabilities primarily through its consumer-facing app and web chat interface, where uploaded documents are processed through text extraction and then used for analysis, summarization, and question answering. File handling behavior differs significantly between the consumer interface and developer workflows, making it important to understand what is officially supported, what is implied by usage patterns, and what limitations apply in practice

Google’s Gemini platform has entered a phase where changes are no longer announced only through model names or launch events. Signals now emerge from infrastructure investments, developer tooling updates, product integrations, and the way Google describes its own AI roadmap. As Gemini 3 continues to expand across consumer apps, Workspace, and APIs, attention is increasingly shifting toward what comes next for the platform as a whole. The name “Gemini 4” has begun to circulate