It appears that SkyMiles is now charging 105,000 miles each way for transatlantic business class awards, up from 86,000 miles. That’s a 22% devaluation without notice on top of Delta’s already most-expensive saver awards compared to competitors, and a 50% increase in a year.
When Delta raised transatlantic prices to 86,000 miles just over a year ago they rolled back the increase briefly, before bumping it up again to 82,000 miles in June. So we don’t know if this new highest price will hold in the immediate term.