The “Song of the Summer” is a myth. Or at least, it’s a fragmented one. But for hip-hop fans, Fenix Flexin’s “Rubberz” has been a dominant contender since June. It’s charting. It has millions of views. It’s catchy.
There’s a catch.
The track is a synth-pop banger. Fenix Flexin is a drill rapper from East Hollywood. His voice is nasally. Congested. Distinct. The voice on “Rubberz” is crisp. Bright. Almost morrissey-chipper.
People noticed. Accusations flew. Was it AI?
For months, Fenix denied it. He called it auto-tune and reverb. A “fake UK accent,” he joked. He showed a project file that producers dismantled in the comments as a stem-split trick. Then he deleted it. Silence followed.
Then came Medasin.
An independent producer, Medasin posted evidence this week. He claims Fenix didn’t use Suno or Udio. The big players. No. Fenix used Treblo. A lesser-known generative AI tool. And now, the creator of Treblo has effectively confirmed it.
Treblo’s new detector flags “Rubberz” as likely AI-generated. It also flags Tyga’s recent tracks. The snitch is in the machine.
The Treblo Connection
Medasin’s video dropped on Thursday. It wasn’t a guess. It was an autopsy.
He pointed to the filename “Sonauto.mp3” in one of Fenix’s old Instagram stories. Treblo used to be called Sonauto. Two days before the release of “Rubberz,” the app changed its name. Coincidence? Maybe.
Then came the replication test.
Medasin used Treblo to generate a track. His prompt? “80s synthwave” and “rapper lifestyle.”
The result was a mirror image of Fenix’s hit.
“Diamond chains hanging heavy.”
“I see your face in the champagne bubbles.”
Fenix sang:
“Now I bought a heavy diamond chain.”
“Still seeing your face in the glass.”
Both songs mention thick pockets. Plastic smiles. A thematic shift from night to day.
“There’s just way too many coincidences. It is just a mathematical impossibility that he Did not use Treblo.” — Medasin
I tested it myself. You can replicate the “Rubberz” vibe with simple tags. The AI engine seems obsessed with “finger/linger” rhyme schemes. It loves rings. Glass. Pockets. It’s a formula. And Fenix followed it perfectly.
The Evidence Vanishes
Fenix responded to Medasin’s accusation. He posted an Instagram video. It showed what he claimed was the original studio project file. Proof he made it by hand.
The music community saw right through it. Producers noted the file looked like the output of a stem separator. A way to hide the fact that the track was generated in its entirety by an AI.
Hours later, Fenix pulled the post.
Neither Fenix nor his credited producer, Purps on the Beat (who has also denied AI use), have addressed the disappearance. WIRED reached out for comment. No response.
Tyga Gets Flagged Too
On Saturday, Medasin went bigger.
He turned his lens to Tyga. His labelmate. Fellow Shoreline Mafia affiliate. The video accuses Tyga of using Treblo on his new $TARFACE project.
The connections are loose. Tyga and Fenix were seen together. Both are shifting to ’80s aesthetics. But the digital evidence is harder to dismiss.
Medasin ran a Tyga track through an early version of a detector. It flagged.
Then Treblo themselves stepped in.
Ryan Tremblay, co-founder of Treblo, gave a statement that didn’t say “Guilty” but certainly didn’t say “Innocent.”
“Someone appears to have used our model to find a sound that millions of people connected with, and that’s exciting,” Tremblay said.
Treblo wasn’t even aware of “Rubberz” until it hit the charts. That’s convenient.
The Detector is Live
On Sunday night, Treblo released a page: “Was This Made With Treblo?”
It’s a detector. Tuned to find their own output with little to no modification.
The result for “Rubberz”?
“Very likely Treblo.”
A recent Tyga track?
“Likely Treblo.”
Treblo claims a false-positive rate of under one in 10,00. They’ve open-sourced the code. You can check the math yourself.
Requests to Tyga’s label were ignored.
Slop or Art?
The timing isn’t random.
LinkedIn is adding “Seems Like AI” buttons. Substack is flagging AI newsletters. Spotify is tracking reported AI slop. Senators are pushing for an AI Labeling Act.
We want to know what’s real. We want labels. We want transparency.
But here’s the rub.
Some people don’t want to know.
The comments under Medasin’s videos are full of fans defending the music. “I don’t care if it’s AI,” they say. “It’s catchy.” “The future is now.” “Medasin is just jealous.”
Medasin admits he likes the song. It’s stuck in his head. It’s clever. He’s enjoying it, ironically.
But he took the hit anyway. He exposed the tool. He risked being called a conspiracy theorist. Why?
Because the fantasy of the human artist matters to him. Or maybe because he knows that once you accept the machine can make hits, the whole industry breaks.
Treblo says it’s exciting. Fenix says he used reverb.
The detector says otherwise.
The summer isn’t over. The argument just started. And nobody’s answering the phone.
