I compared Suno v4.5 vs. v4 – Here’s The Result

AI music has leapt forward again. Suno’s brand‑new Model 4.5 promises “a new era unlocked,” boasting crisper mixes, bigger genre coverage, expressive voices, and twice‑as‑long tracks. After a weekend of stress‑testing every feature— from whisper‑soft ballads to Gregorian‑EDM parkour anthems—here’s what actually matters.

Whats new on Suno 4.5?

Expanded Genres & Smarter Mash‑ups

Suno v4.5 dramatically increases the number of recognizable genres—everything from “punk rock” to “Gregorian chant.” Even better, blending two styles now produces cohesive tracks:

Example Prompt:

Midwest emo + neosoul

In v4.0 this might lean 90% emo, 10% soul. In v4.5 it nails a seamless fusion: jangly guitars, mellow bass lines, and a laid-back groove.

Quick verdict: Mash‑ups finally sound intentional, not random.

90s house mixed with soulful gospel, 124 BPM,
piano stabs, call‑and‑response choir,
uplifting key change after first chorus.

Result: Bright 909‑style drums, classic M1 piano riff, and—crucially—authentic gospel harmony that resolves into a key lift on bar 33. Version 4.0 often buried one genre; 4.5 balances both.

Enhanced Voices & Prompt Sensitivity

Subtle details—like “leaf textures” or “melodic whistling”—now come through clearly. v4.5 picks up on layered arrangements, tone shifts, and sonic nuances you specify in your prompt. 4.5 introduces sub‑register articulation (whisper, belt, falsetto) without forcing you to tag every nuance.

The shimmer artifact that plagued high tenor parts is ~80 % reduced, so stems survive external mastering.

Prompt Enhancement Helper

v4.5 respects your instructions more faithfully. Whether it’s tempo, instrumentation, or mood, what you ask is closer to what you get. Click the 🎲 dice icon and Suno rewrites shorthand tags into descriptive prose for you.

Before: trap beat, jazz piano, female vocal w/ vibrato

After (auto‑expanded):

“Melodic trap groove underpinned by bouncy 808s, sparkling jazz piano riffs and a soulful female lead weaving gentle vibrato into each hook.

Reality check: you won’t always love the phrasing, but novices instantly gain the kind of detail pros already type manually.

Covers + Personas Combo

Covers now retain more melodic detail, even when switching genres (e.g., turning a rock anthem into a house remix). Personas better preserve an artist’s unique vibe and can be combined with Covers for full-track makeovers. Old models made you choose: either transform a song, or sing it as your custom persona. Now you can overlay both—think “Johnny Cash sings Blinding Lights as a reggae lullaby.”

One‑click Workflow

1. Upload or paste the YouTube URL you want covered.
2. Select a saved Persona (e.g., “Gritty Baritone”).
3. Add style tweaks (reggae, 75 BPM, off‑beat guitar).
4. Hit Create.

You get melody‑faithful phrasing, the persona’s timbre, and the requested style swap—all in one render.

8‑Minute Extended Songs

PRO TIP: Instruct the model to produce long length piece in the style field. For ex. I tried "8-minute length" and sometimes the prompt has been followed. I've got initial 7-8 minute audio.

Long‑form creators (lo‑fi playlists, meditation apps, drone videos) rejoice: no hacky “Extend → Extend” loops. You can jump straight to 8 m 00 s.

Tip: When extending, mark where to continue (start, mid‑break, outro) or the engine may recycle motifs too quickly.

Click the triple-dot icon next to the track title and select Extend from the dropdown menu. This enters the Extend workflow, which presents:

• Extend From: A timestamp selector or waveform scrubber to choose where the new segment should begin.
• Lyrics Field: Input area for additional lyrics or musical instructions for the extension.

Speed & Audio‑Quality Benchmarks

Enhanced mixing delivers fuller, more balanced tracks with reduced shimmer and less degradation, even on longer compositions. Instruments sit in the mix without muddying vocals, making post-production easier.