The problem with an anti-matter weapon is containment. But in all seriousness they have been working on AI for the past 30+ years, where is that? Just because they are working on it doesn't mean that it is actualy going to work. How long have we been working on a controled fusion reaction? And it is something that is obviously possible, just look at the sun. (But don't stare at it!
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As for the EMP effect of a Nuclear weapon, you will notice that the damage charts in HG/MT/T20 all effect computer components on the Radiation Damage chart. Radiation actually would have little physical effect on these types of systems however the EMP component of the blast would have this effect. As for an EMP weapon without the Nuke? Actual utility of such a weapon is rather limited. Most military systems are already hardened against it and the weapon itself doesn't exist in a practical form yet.
Weapons that don't have a practical military application are unlikely to be built. Notice major powers willingness to abandon Chemical and Biological Weapons. These weapons were developed in the past, before there was a practical defense against them. Using, even the most advanced Nerve Agent against a modern military, IE the US Army, The British Army, The German Army, even the French or Russian Armies is unlikely to produce significant casualties, probably less than a conventional explosive round, on the other hand it is likely to tick off the army that it was deployed against.
The big threat of, So called, Weapons of Mass Destruction is against civilian targets. Even Nukes are not extremely effective against a deployed field military unit. (Though in quantity they will cause more damage than conventional munitions.) Now against civilian targets, hardened point targets, Command and Control Centers they are extremely effective.