Large-context code
Reason over an entire repo in a single prompt.
Reason over a whole repo at once
Gemini's standout coding capability is its very large context window, which lets you put an entire codebase — or a large slice of it — into a single prompt and have it reason across the whole thing. That unlocks tasks that are awkward with a small window: understanding an unfamiliar project, tracing how a change ripples through many files, or reviewing a large body of code in one pass. Instead of feeding it fragments and stitching the answers together, you give it the full picture and ask.
Ask questions that need the whole picture
Play to the strength by asking things that genuinely require breadth: 'where is this value set and everywhere it is used', 'what would break if I change this interface', 'summarise how auth flows through this codebase'. These are questions a fragment cannot answer. Give Gemini the relevant files together and a precise question, and its long context does the cross-referencing. As always, relevance still helps — include the parts of the codebase that bear on the question rather than truly everything.
How does Gemini's large context help with code?
It lets you put an entire codebase or large slice into one prompt, so Gemini reasons across the whole thing — ideal for understanding a project, tracing changes, or reviewing lots of code at once.
What questions suit Gemini's long context?
Ones needing breadth — where a value is set and used, what a change would break, how a flow works across files. These require seeing the whole picture, not a fragment.
Should I give Gemini my entire repo every time?
You can, but relevance still helps. Include the parts of the codebase that bear on the question rather than truly everything, so the answer stays focused.