chirp-v4-5-plus is the Suno V4.5+ music creation model, suitable for creating vocal songs and instrumentals from theme descriptions or self-written lyrics. It is designed for creative tasks that require refining lyrics, titles, and styles, and can also be used to remake older songs. Through this platform's music API, you can submit creative content and obtain audio and song information, making it easy to integrate previewing, selection, and delivery into applications.
Clarify capacity, inputs and outputs, and invocation methods before selecting a model.
The above input limits and invocation methods apply to this platform's music entry point; desired duration and vocal preference do not guarantee the final output.
Discover what chirp-v4-5-plus can bring to your work.
When lyrics are not yet written, use Inspiration Mode to describe the theme, mood, and musical direction; when lyrics already exist, switch to Custom Mode to organize the lyrics, title, and style separately. The two approaches are suited to exploring ideas and realizing specific works respectively, so creation does not always have to rely on a vague prompt.
Custom Mode provides separate lyric and style inputs, making it easier to arrange verses, choruses, and bridges, and describe genres, instruments, and moods. Vocal tasks can also specify a preference for male or female voices. For works that need to retain a copy theme while trying different musical expressions, this structure makes comparison and revision easier.
V4.5+ is suitable not only for generating from scratch, but also for remastering older songs. When an existing song is available, you can start a separate task through remaster, then compare the new audio result with the original. Remastering is suitable for exploring sound presentation and should not be viewed as a guaranteed way to fix all recording issues or precisely preserve every detail.
Start with specific tasks to find where the model can make an impact.
Organize brand slogans, event themes, and lyrics that must appear into custom inputs, then use a style description to define the musical direction. The deliverables are listenable song audio along with lyrics, titles, and other information, making it suitable to compare creative options first and then have editors select versions appropriate for promotional videos, event openings, or social content.
Describe the scene, mood, and intended use of the soundtrack for a video, then set instrumental=true in Inspiration Mode to generate instrumental options. If you need to provide a desired duration, use the custom generation mode with custom=true and use duration as a directional guide; the finished result still needs to be edited according to its actual length. This is suitable for producing soundtrack proposals and preview materials, rather than requiring music to align precisely with every visual cut.
Include existing songs in remastering tasks, retaining the original song ID and new result information to create version records that are easy to compare. After the task is complete, the application can present the original and remastered versions for listening, then deliver the selected audio. This is suitable for maintaining a creative catalog and reassessing older material, rather than automatically replacing human mixing judgment.
Choose based on task complexity, input materials, and expected results.
V4.5+ and chirp-v4-5 are different model variants. If you are continuing to use the V4.5 creative workflow and want to try an enhanced-quality version or remaster older songs, you can choose V4.5+. Both support custom lyrics and style tasks. It is recommended to compare vocals, arrangements, and thematic expression using the same materials, rather than deciding based solely on the Plus name.
chirp-v5 is another version, not an alias for V4.5+. If you already have V4.5+ works and fixed creative templates, you can continue using it to maintain your workflow; when preparing to switch to V5, first compare them through listening tests using representative lyrics and styles. The key criterion should be whether the work meets your needs; do not automatically treat editing features of other versions as capabilities of this model.
From a small-scale task to full integration.
Define objectives, required inputs, and output requirements, using real business examples as a starting point.
Open the trial page, confirm the parameters supported by this entry point, then submit a small-scale task to review the results.
Keep the complete model ID, use the request format specified in the documentation, and confirm billing rules on the Pricing page.
Understand output quality and capability scope before formal use.
Answers to common questions about using chirp-v4-5-plus.
No. chirp-v4-5-plus corresponds to V4.5+, while chirp-v4-5 corresponds to V4.5; you need to specify the model separately when calling it. If you already have a V4.5 template, you can keep the lyrics and style input, compare the actual audio from both versions, and then decide whether to use V4.5+.
Select generate and set custom=true, put the lyrics in lyric, and write the title and music direction in title and style respectively. V4.5+ has a lyric limit of 5000 characters and a style limit of 1000 characters; organize the text into sections such as verses and choruses to help express the song structure.
You can start with inspiration mode, use custom=false, and describe the theme and music direction in prompt, with a maximum length of 500 characters. For instrumental music, set instrumental. If you already have specific lyrics, custom mode is more suitable, so you do not need to squeeze the lyrics and all requirements into the inspiration prompt.
You cannot treat the duration parameter as a hard guarantee. For custom generation, duration can be an integer from 10–360 seconds, but it is used to guide creation. After completion, read the duration in the result and listen to it; if it is for a fixed-length video or advertisement, make any necessary edits to the audio.
For generation tasks, you can obtain task_id with async=true and then query it, or set callback_url to receive the result; after completion, save the song ID and audio address. Old-song remastering is a separate remaster task, which should be initiated using existing song information, then compare the new audio with the original before choosing one.
Model information · Updated: 2026-10-01. For calling parameters and billing rules, see the API and pricing sections.
Start with a clear goal and determine from actual results whether it suits your work.
Pricing
$0.0532· per generation
You pay$71,316for 750,000 credits · $0.0951 / credits46% OFF
You're billed in credits. Pick a top-up tier to see its per-credit rate — the larger the top-up, the cheaper each credit.
This is only a basic call example. See the full docs for more parameters and advanced usage.
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