Best Long Context Models for iPhone 16 Pro

iPhone-local AI meets its hardest wall here. The 6GB AI budget barely covers a small model plus a few thousand tokens of cache. Useful windows land in the 4K-8K range: an article, a meeting transcript, an email chain. The roughly 60 GB/s A18 Pro memory path (est.) makes even that small window feel slow on long reads.

Push further and the app either truncates silently or slows to a crawl, and phone AI apps rarely surface which. Test with a known-length document before trusting it. The mobile pattern that works: condense on the phone, keep summaries in notes, run corpus-scale questions on a Mac. For genuine document analysis, remote-control a home Mac instead.

With a 2B-4B model loaded, the remaining memory supports windows in the 4K-8K range: a long article, a meeting transcript, an email chain. Push further and the app either truncates silently or slows to a crawl; phone AI apps rarely surface which, so test with a known-length document.

The workable mobile pattern is summarize-and-carry: condense on the phone, accumulate summaries in notes, do corpus-scale questions on a Mac later. For genuine document analysis from your pocket, remote-control a home Mac (Tailscale plus Open WebUI) instead of fighting the phone.