Claude

For about two weeks in June, the most capable AI model on the market was, in a real legal sense, off-limits. If you were not a US national, you were not allowed to touch it. This is the Claude Fable 5 story, and it is less about one model than about a line that just got crossed.

Claude Fable 5 is the best model I have put on real work this year. It is also expensive enough to make you flinch, and it spent the second half of June switched off by a government order. All three of those things are true at once, which is the only honest way to review it.

Coding assistant comparisons usually happen on toy problems with clean answers, which is exactly why they are useless. So I did the opposite. I took one genuinely annoying real bug, the kind that spans a few files and does not announce itself, and pointed three assistants at it: Claude, GPT, and Microsoft new MAI coding model in Copilot. Here is how they actually did.

People want one answer to "which AI is best," and there is not one. There is a best model for coding, a best for long documents, a best for cheap bulk work, and a best for running on your own hardware, and they are rarely the same model. Here is how I actually pick, in mid-2026, after using all four families on real work.

June and early July gave us a model release almost every day, which is exactly why you should not try to follow all of them. Most were incremental. A few will still matter next summer. Here is the month sorted the only way that is useful: by how long it will stay relevant.