HeyGen vs Kling: script avatars or image-plus-audio clips

HeyGen vs Kling for a talking presenter is script versus audio: HeyGen takes a script, an avatar and a voice and renders the whole video, up to 30 minutes per request. Kling's Avatar API takes one image plus a 2–300 second audio track and animates the face to it, so you supply the voice, either as a file or from Kling's own TTS call.

The HeyGen facts come from its pricing, API pricing and Digital Twin video pages; the Kling facts from its Avatar API and video pricing pages, all read on 2026-09-29. It compares inputs, limits and price, not output quality.

How do HeyGen and Kling avatars compare?

What does Kling's Avatar API need?

A POST /v1/videos/avatar/image2video with one JPG or PNG image and exactly one audio source: a sound_file of 2–300 seconds, or an audio_id from Kling's TTS, which the pricing page lists at $0.007 a call. An optional prompt directs actions, emotions and camera movement. Kling API avatar covers every input rule.

What does a HeyGen API avatar video need and cost?

A POST /v3/videos with type: "avatar", an avatar_id, a script and a voice_id; Avatar IV is the default engine. The API is pay-as-you-go and priced per minute by engine and avatar type: Avatar V Digital Twin at $7.20, Avatar IV Digital Twin at $4.83, and Avatar III from $0.60. It is bought apart from HeyGen's app plans, which run from Free ($0, 3 videos a month) through Creator at $29, Pro from $49 and Business at $149 a month plus $20 a seat.

HeyGen API pricing covers the credit rules.

HeyGen or Kling: which should I pick?

• Pick HeyGen if you start from a script, want a stock, photo or custom avatar voiced for you, or need videos longer than five minutes.
• Pick Kling's Avatar API if you already have the voice track (a recording, a dub, your own TTS) and one image, and want to control the voice yourself.

Can one API do both?

Sume has both shapes. POST /v1/avatar-1.0/talking-video is script-driven: a ready avatar, a script estimated at 4–60 seconds, 720p as the documented resolution, English only in current code, at $0.184/s standard, $0.245/s plus, $0.55/s max (no product image) (Generate avatar video). VEED Fabric 1.0 is image plus audio: a still or avatar and up to 300 seconds of Sume-hosted audio under 10 MB, at $0.1875 per audio second (720p) (Sume API reference). Both add a 5.5% agent fee by default.