Suno v6 vs Suno v4: Everything That Changed Since the 2024 Model

Before comparing Suno v6 to Suno v4, it helps to know that Suno already made the decision for you: on September 9, 2026, the company retired Suno v4 and every other older model, and the model picker now offers only the v6 generation. So "Suno v6 vs Suno v4" is not a live choice you will find in the app — it is a question about whether two years of Suno's history changed what the platform is for, and whether anyone still thinking in Suno v4 terms should update their mental model. Suno v4 shipped in November 2024; Suno v6 launched September 9, 2026. In between, the line ran through Suno v4.5, Suno v5 and Suno v5.5 before Suno tore it up and rebuilt on licensed music. That last part is the real story of this matchup.

If you learned Suno on v4 — the version that made the app famous in late 2024 — most of what you know is still true at the surface: you type a description, Suno writes a song with vocals, and you iterate until one lands. Everything underneath that surface changed. The training data is licensed now. The editing is surgical instead of regenerate-and-pray. The free tier is a real model rather than a credit trickle. And the legal reason many people refused to touch Suno in the v4 era — that its models were trained on unlicensed music — is precisely what v6 was built to retire.

Get the version history straight first

Suno v4 was released in November 2024, not as a one-off but as the version that introduced four-minute generations, the ReMi lyrics assistant, personas, covers, instrumental-only mode and rudimentary stem separation. It was followed by Suno v4.5 in May 2025 (longer generations, better prompt adherence), v4.5+ in July 2025, Suno v5 in September 2025, and Suno v5.5 in early 2026. The only reason this matchup exists is that v4, not v5.5, is the version most people remember and the version a lot of older tutorials and third-party tools still reference. When v6 launched, all of them — v4 included — were switched off at once.

• Released — Suno v4 November 2024 vs Suno v6 September 9, 2026.

• Training data — Suno v4 trained on unlicensed web data, the subject of the 2024–25 label lawsuits vs Suno v6 trained from scratch on licensed catalogs from Warner, BMG and Believe, with Universal and Sony excluded.

• Editing — Suno v4 regenerate-the-whole-track, plus Remaster and ReMi for lyrics vs Suno v6 section rewrite, single-lyric swap, mashups, audio sampling and image/video/voice-memo prompts.

• Generation length — Suno v4 capped around four minutes in a first pass vs Suno v6 custom/auto duration with a Max Mode for long-form consistency.

• Free tier — Suno v4-era free plan with a small daily credit allowance vs Suno v6-mini, a dedicated free model Suno claims beats any free music model on any platform.

• Ownership — Suno v4 paid plans allowed downloads and commercial use under Suno's terms vs Suno v6 paid tiers get assigned rights in outputs, with label revenue-sharing built in.

Suno v4-era capabilities are documented from Suno's historical release notes; v6 claims are Suno's launch reporting. Neither generation has an independent listening score, and the quality comparisons between them are necessarily the vendor's.

What a v4 user will actually notice

The headline change is editing. On Suno v4, fixing a song meant regenerating it — you could Remaster an older track up to v4 quality or run ReMi to draft better lyrics, but you could not reach into the arrangement and change one part. Suno v6 can. You can rewrite a specific section in plain language ("make the chorus a gospel choir"), change a single lyric without rebuilding the vocal around it, mash up vocals from one source with drums from another, and sample a specific element from an uploaded recording ("the guitar riff at 0:45"). For anyone who spent 2024 re-rolling the same prompt forty times hoping for one usable chorus, that is the difference between a slot machine and an editor.

The second change is input. Suno v4 took text. Suno v6 takes text, audio, images, video and voice memos — a scoring workflow for video is now plausible where it was not before. The third is control. Advanced Mode in v6 adds vocal-gender selection, custom or auto duration, a Max Mode toggle for consistency across long songs, covers and voices, and the Weirdness, Style Influence and Variety sliders, alongside the "My Taste" personalization setting. Generations are filed into workspaces instead of one growing library.

The things that made v4 popular did not vanish. Personas, covers and voice consistency are still part of the product — Max Mode in v6 is explicitly described as serving covers and voices — and the paid tier still gets you commercial use of what you generate. What changed is the ceiling: v4 was a generator with a few post-hoc tools bolted on; v6 is an editor that generates.

The screen above is Suno's logged-out home page in the v6 era. Everything behind the prompt box now runs on the licensed generation — the model picker no longer contains Suno v4, and it is not coming back.

The reason to switch that isn't about features

The biggest difference between Suno v4 and Suno v6 is not a feature list; it is what the model was trained on and what that means for the people who use it. Suno v4 was trained on unlicensed music from the open web — that is why Warner sued Suno in June 2024, why Universal and Sony are still suing today, and why a Munich court ruled against Suno in the GEMA case on July 31. Warner settled in November 2025, and the settlement turned into co-development: Suno v6 was trained from scratch on licensed catalogs that Warner, BMG and Believe supplied, revenue is shared with those labels from launch day, and Suno says the data "doesn't include data from Universal or Sony."

For a creator who avoided Suno in the v4 era specifically because the training data felt like theft, that is the change that matters. v6 does not erase the litigation over what v4 was trained on — those cases are about the past and are still running — but the model you would use going forward is no longer built the way v4 was built. The ethical objection that kept people off Suno in 2024 is now aimed at a retired model, and Suno's current one has named rightsholders as partners rather than adversaries.

The honest caveats

Three things keep this from being a one-way door. First, "licensed" applies to v6's training data; Suno's legal exposure over the older models is unresolved, and if you are a business relying on a clean rights chain, the label deals strengthen your position but do not bulletproof it. Second, not every v4-era behavior is confirmed to have survived the rebuild — Suno's launch materials describe the new editing and Advanced Mode in detail but are quieter about legacy specifics like stem counts, so verify anything your workflow depended on before you assume it carried over. Third, all of v6's quality claims are Suno's; there is no independent listening test of v6 or of v6 against the retired models, so "it sounds better" is, for now, the vendor talking.

Who should act on this

If you are still using Suno v4 through old tools, tutorials or muscle memory, the practical answer is simple: you are already on v6 or you are on a third-party wrapper that Suno has cut off — either way, re-learn against the current app, because the old model is gone and every workflow built on it is running on borrowed time. If you avoided Suno on principle over the v4-era training data, the licensed rebuild is the moment to re-evaluate with the honest caveats above in hand. And if you are deciding whether the paid tiers are worth it over the free Suno v6-mini, run the same prompt on both and judge with your own ears — for a two-year jump that rewrote the platform's data, legal and editing foundations, that test is the only part of the comparison Suno cannot spin.