In a post on X, developer @thdxr said GPT-5.6 had a "massive impact" on his team, to the point that they're using "5x the tokens" they used before. The striking part of the claim was why: he wrote that GPT-5.6 is "not even smarter than fable or anything," but "just so reliable and fun to use." A later quote-post from @steipete helped push the claim wider.