Suno Song Cuts Off Early: Fixes for the v4 Truncation Bug

April 22, 2026 · Editorial Team · 5 min read · suno troubleshooting error-fix

You pasted a full verse-chorus-verse-chorus-bridge-outro structure into Suno v4, hit generate, and the song stopped cold at 1:47 when your lyrics had at least another 45 seconds to go. The track just ends on a random word, mid-phrase, sometimes mid-note. No fade, no resolution. You tried regenerating and got a different but equally truncated version. If you're on a Pro or Premier subscription expecting 4-minute outputs, watching Suno chop your song at the 90-second mark feels like a broken feature. The fix isn't obvious from the interface, but there are specific patterns that cause this and specific ways around it.

What this error actually means

Suno v4 generates audio token-by-token with a maximum context length. When the lyrics are long or the generated audio contains complex arrangements, the model hits its generation budget before completing the musical phrase. The cut-off point isn't a random failure. It's the model reaching its per-clip token limit and stopping cleanly rather than generating silence. This is different from a server timeout, which produces a corrupted or failed generation. An early cut-off usually means the clip was technically completed, just much shorter than your lyrics required.

Quick fix (when you need it working in 60 seconds)

In Suno, open the song that cut off and click the Extend button (the arrow icon below the waveform).
In the Extend modal, set the start point to 5-10 seconds before where the song cut off.
Paste the remaining lyrics into the extension prompt.
Click Generate. Suno will produce a continuation that picks up from that audio context.
Download both clips and merge them in any audio editor. A simple crossfade of 1-2 seconds at the join point removes the seam.

Why this happens

The most common cause is lyric length. Suno v4's lyric input has a visible character limit, but the actual generation limit is based on how many audio tokens the model predicts the lyrics will consume. Dense, syllable-heavy lyrics with complex rhyme schemes take more tokens per second of audio than simple, spacious lyrics. A verse with 12 syllables per line generates roughly 30% more audio tokens than a verse with 8 syllables per line at the same tempo.

Style tags also affect token consumption. Tags like [fast tempo], [double-time], or [rap] push the model toward syllable-dense arrangements that eat through the generation budget faster. A 200-word lyric sheet that would generate a 3:30 ballad might only produce a 1:45 rap track before hitting the token ceiling.

Instrumental sections are often misused. Including tags like [guitar solo: 16 bars] or [long breakdown] signals the model to generate extended instrumental content, which consumes tokens without advancing through lyrics. If your instrumental tags are generous and your lyrics are long, the model may not reach the end of the lyrics before hitting its limit.

Suno's server load matters too. During peak hours (typically 18:00-23:00 UTC on weekdays), the platform throttles generation depth to maintain response times. The same lyrics that generate a complete 3:30 song at 6am may cut off at 2:15 during evening peak hours. This isn't documented publicly but is a consistent pattern reported by Pro subscribers.

Finally, some genre combinations confuse the model's internal tempo detection. A prompt that asks for [jazz fusion, hip hop, 140 bpm] creates conflicting rhythmic expectations. The model resolves this inconsistency by defaulting to a faster effective tempo than you intended, which means it burns through lyric content faster and runs out of generation budget sooner.

Permanent fix

Break long songs into sections. Instead of generating the full 4-verse structure in one pass, generate the first verse and chorus, then extend for subsequent sections. This sidesteps the token limit entirely.
Keep each generation's lyric input under 180 words. Count words in your lyrics before pasting. For longer songs, plan your generation in 2-3 chunks.
Use the [instrumental intro] tag sparingly. If you want an 8-bar intro, write it as [8-bar intro] rather than [long instrumental intro] to prevent the model from over-generating.
When specifying song structure, use Suno's metatag format precisely: [Verse 1], [Chorus], [Bridge], [Outro]. Avoid free-form structural descriptions that the model has to interpret.
For long songs, set a simpler style tag combination. Stick to two or three style descriptors rather than five or six. This reduces the model's arrangement complexity and leaves more budget for lyric completion.
Generate during off-peak hours if your song requires maximum length. Early morning UTC (04:00-09:00) consistently produces longer complete generations than evening hours.
After your full song is assembled from multiple generations, check the transitions at each join point. Use the Suno "extend from here" feature from the end of one clip to generate the next if you want tighter musical continuity than a manual stitch provides.
Save your style, BPM, and structural tags as a template document. Consistent settings across extensions ensure the instrumentation doesn't shift mid-song.

Prevention

Before generating a full song, test your lyric density with a single verse and chorus. If that 60-word test generates a clean 50-60 second clip, your pacing is good. If it generates a 30-second clip, your lyrics are too dense for the target duration and you'll hit the truncation limit on a full song.

Plan your song structure before you write lyrics. Decide how many sections you want, estimate 45-75 seconds per section depending on tempo, and divide the song accordingly. This lets you design generation chunks that stay within Suno's effective limit rather than discovering the limit mid-project.

Keep your extension chain organized. When you use Extend repeatedly, Suno builds each new clip on the audio context of the previous one. If you extend from a clip that had generation artifacts, those artifacts propagate. Listen to each clip before extending to catch problems early.

Subscribe to Suno's update log. The v4 model has received three updates since launch, and the token limits and metatag handling have changed with each one. What truncated your songs in February 2026 may not behave the same way in June 2026.

When the fix doesn't work

If extending consistently produces clips that don't match the audio style of your original generation, check whether you're extending from the right clip. Extending from a regenerated version rather than the original can create a style fork.

If the first generation always cuts off under 60 seconds regardless of lyric length, check your account's generation quality settings. Some plans have a "Standard" mode enabled by default that limits clip length. Switch to "Quality" mode in Settings if available on your tier.

Contact Suno support through the in-app chat if you're on Premier and consistently getting sub-2-minute outputs. Premier subscribers have a higher generation budget, and consistent truncation at low durations suggests an account-level configuration issue.