Sham News: The Real Hartenstein Deal
Adrian Wojnarowski used to bomb us with agent-spin regularly, "rounding" contract numbers above their actual rounding values and framing signings as "extensions" that clouded the news cycle so it didn't highlight any paycuts or disappointments to their client's outcome. Shams Charania appears to be leveling up like his predecessor, going from exaggeration to reporting blatantly impossible mechanics at the behest of the agent giving him the scoop.
The Fake Sham News: Hartenstein agreed to a fully-guaranteed deal with a "unique" mutual option between the player and the team.
Factcheck: Players and Teams cannot both hold early termination or option triggers on the same deal. These opt-out mechanics are limited to one side or the other.
The likely realities:
Option A - close to the report: The deal is non-guaranteed or partially guaranteed in 2028-29, and Hartenstein has a player option for that year. This would not be "unique", since James Harden's deal works this way. But also, if Hartenstein's 2028-29 salary is not fully guaranteed while he carries a player option, the 2027-28 year would have to be partially guaranteed at the same percentage. This is the closest possibility to a mutual option, but it's the most far-fetched.
Option B - further from the report: It's a simple player option ahead of the 2028 offseason. He could negotiate with the Thunder after the 2027-28 season, finding out what kind of offer they would extend if he opted out. OKC would have his Full Bird rights at that point, so they could offer up to a maximum 30-35% of the cap for up to 5 years. Right now, they could only offer 175% of his prior salary for 2-4 years via Early Bird Rights.
In this scenario, he could choose to decline because he sees a better deal for himself on the free agent market or has leveraged an offer he likes from the Thunder. Thus, both sides have a mutual interest in the timing of his player option. This is more likely, but less "unique" and much further from a practical "mutual option".

Option C - your guess is as good as mine: There could be something even wilder about the deal, or it could include some novel, legal clause that the Thunder and Hartenstein's agents actually unearthed. But the league would likely discipline the Thunder and void any deal deemed to be an intentional circumvention of the CBA, whether on paper or due to a side-agreement outside of the the contract itself.
The most important aspects of the deal are still good news for Thunder fans: Isaiah Hartenstein has a 3-year, $75 million deal in place through the 2028-29 season. The mechanics for the last year are just murky.
