NASCAR 26 does not have a feature officially labeled "AI difficulty slider," but it does have two confirmed, related systems: an overall difficulty preset paired with a Training Difficulty setting, and separately adjustable driver ratings. The Day One Patch (September 16, 2026) specifically fixed how those two difficulty settings sync with each other.
What's Actually Confirmed
The clearest evidence comes from NASCAR 26's Day One Patch notes, dated September 16, 2026 and reported by The Daily Downforce. The official patch note reads: "Fix Training Difficulty setting to immediately update to the correct value when changing overall difficulty preset." That single sentence confirms two things at once: the game has an overall difficulty preset, and it has a separate Training Difficulty value tied to it — previously, changing the preset didn't immediately update Training Difficulty to match, and this patch fixed that sync bug.
Separately, NASCAR.com's driver ratings preview confirms that individual driver ratings — the same ratings covered in the Drivers hub — were developed with NASCAR Racing Insights and can be adjusted by players. This is a different system from the difficulty preset: it changes how strong specific named drivers are, not an overall AI difficulty level for every opponent.
The same Day One Patch also improved AI pitting logic at the end of stages and while cars are on pit road — a race-behavior fix, not a difficulty change, but worth knowing if you're troubleshooting odd AI behavior after the patch.
What's Still Unconfirmed
No source reviewed for this guide publishes the actual preset tiers (whether they're named Easy/Medium/Hard or something else), the numeric range for Training Difficulty, or how the preset and driver ratings interact with each other in an actual race. Those details are UNCONFIRMED. If you're searching for a specific number to set, that number has not been published by NASCAR, iRacing Studios, or any outlet covering the patch notes.
Where to Look In-Game
Because the sync bug fix specifically referenced "changing overall difficulty preset," start by checking your game's general Settings or Difficulty menu for a preset selector — that's the setting the patch note is describing. Training Difficulty is confirmed to sit alongside it and update automatically as of the September 16, 2026 patch, so you shouldn't need to set it separately anymore. If you want to change how challenging specific opponents are rather than the field as a whole, that's the adjustable driver ratings system instead, covered in the Drivers hub.
FAQ
Not by that exact name. It has a confirmed overall difficulty preset and a linked Training Difficulty setting, per the September 16, 2026 Day One Patch notes, plus a separate system of adjustable driver ratings.
It fixed Training Difficulty so it immediately updates to the correct value when you change the overall difficulty preset, instead of lagging behind the new setting.
Yes. NASCAR.com confirms driver ratings, developed with NASCAR Racing Insights, can be adjusted by players — a separate system from the overall difficulty preset. See the Drivers hub.