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What is the largest amperage QO-GFI available?

The largest single pole available is the 30 A (QO130GFI). The largest three pole is the 50 A (QO350GFI).

In two pole, we have the 60 A available (QO260GFI), however it is not available with a load neutral connection, and is therefore only available for 240 V or 208 V 2 wire loads. It cannot be used on loads with a neutral.
The largest two pole breaker with a neutral connection would be the 50 A (QO250GFI).

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