Kling
Kling LipSync brings Kling's industry-leading human motion engine to audio-driven talking head generation, producing smooth, natural lip movements and facial expressions that rival OmniHuman at a lower price point. At 17 credits per job (fixed, regardless of audio length), it sits in the middle tier between OmniHuman's premium pricing and Pixverse's budget rate of 6 credits/second. The architecture advantage: Kling LipSync is powered by the same engine that makes Kling 3.0 the best video model for human motion, meaning jaw movement, cheek deformation, and chin motion are anatomically accurate rather than approximated.
Use a front-facing, well-lit portrait with a neutral, closed-mouth expression. The mouth should be clearly visible — no hands covering the chin, no scarves, and no extreme angles. Resolution matters: 512px minimum on the face area for clean lip animation. For AI-generated portraits (e.g., from Midjourney or FLUX.2), ensure the face is sharply rendered with no artifacts around the mouth or jawline. Blurry or low-resolution mouth areas produce lip movements that look "painted on" rather than natural.
Audio quality is the single biggest factor in lip sync quality — even more than the portrait. Use ElevenLabs v3 or Minimax Speech HD for TTS-generated speech, or upload professionally recorded voiceovers. The audio must be single-speaker with minimal background noise. Mumbling, overlapping voices, or background music cause the model to generate confused, jerky mouth movements. Speaking pace also matters: moderate speed (130-160 words per minute) produces the most natural-looking lip sync. Fast speech (180+ WPM) can cause the model to skip phonemes, creating visually jarring "skipped lip" artifacts.
Add a Tool node on the canvas and select "Kling LipSync A2V" (audio-to-video). Connect both the Image node (portrait) and Audio node (speech) as inputs. Kling LipSync is fully audio-driven — there is no text prompt and no configurable parameters. The model reads the audio waveform and generates matching facial animation frame by frame. This zero-parameter design means the quality is entirely determined by your input assets: the better the portrait and audio, the better the output. At 17 credits per job, the cost is fixed regardless of whether your audio is 5 seconds or 60 seconds — making Kling LipSync increasingly cost-effective for longer narrations.
Kling LipSync occupies the "professional tier" in the talking head model hierarchy. For a single high-stakes video — investor pitch, keynote, or flagship marketing video — use OmniHuman for maximum realism. For daily social media content or 20+ episode educational series, use Pixverse for maximum volume at minimum cost. For professional content that needs to look polished but doesn't justify OmniHuman's premium — training videos, customer-facing tutorials, product walkthroughs, investor updates — Kling LipSync delivers the best quality-to-cost ratio. Its fixed 17-credit pricing is especially advantageous for clips longer than 3 seconds (where Pixverse at 6 credits/second would exceed 17 credits).
Kling LipSync costs a flat 17 credits per job regardless of audio length. For clips under 3 seconds, Pixverse (6 cr/sec) is cheaper. For clips over 3 seconds, Kling LipSync becomes the more economical choice — and the quality is noticeably higher.
Clearly enunciated speech at 130-160 WPM produces the best results. If your audio has fast speech (180+ WPM) or heavy accents, re-record at a slightly slower pace. The cost of re-generating audio (10 credits via ElevenLabs) is less than wasting 17 credits on a poor lip sync.
For multi-clip talking head series, use the same portrait across all clips. Kling LipSync's rendering is deterministic for the same portrait, so character appearance stays perfectly consistent — critical for training courses and video series.
Combine with Kling 3.0 video generation in the same project: use Kling 3.0 for full-body establishing shots and Kling LipSync for close-up talking segments. The shared Kling architecture means the human rendering style is consistent between both outputs.
Kling LipSync produces professional-quality talking head videos with anatomically accurate facial animation — jaw, cheek, and chin movements derived from Kling's industry-leading human motion engine. At 17 credits per job (fixed), it delivers the best quality-to-cost ratio for clips longer than 3 seconds. The three-tier talking head system on Martini: OmniHuman for maximum realism on high-stakes content, Kling LipSync for professional content at moderate cost, and Pixverse for high-volume production at minimum cost. Kling LipSync's specific advantage over Pixverse is motion quality — the lip movements look anatomically correct rather than surface-level, and the jaw/cheek deformation is physically realistic. Its disadvantage vs OmniHuman is subtle: slightly less natural eye movement and less micro-expression variety.
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Get Started FreeByteDance
OmniHuman by ByteDance produces the most realistic talking head videos of any AI model on Martini. Given a single portrait photo and an audio track, it generates video with natural lip sync, subtle facial micro-expressions (eyebrow raises, eye squints, jaw tension), and organic head movement that makes the result nearly indistinguishable from recorded video. At 17 credits per second, it is the premium-tier talking head model — a 10-second clip costs 170 credits. The newer OmniHuman v1.5 (19 credits/second) offers further refinements. Both output at 720p in three aspect ratios (1:1, 16:9, 9:16). If realism is your priority — for executive presentations, keynote addresses, flagship marketing, or professional courses — OmniHuman is the clear choice over the more affordable Kling LipSync (17 credits/job flat) or budget Pixverse (6 credits/second).
View guideLipsync
Pixverse Lipsync is the speed and cost champion for talking head videos — priced at 6 credits per second of output, it makes high-volume production affordable at any scale. A 10-second clip costs just 60 credits compared to Kling LipSync's fixed 17 credits (cheaper only for very short clips) and OmniHuman's premium pricing. The quality trade-off is real: Pixverse produces lip movements that look "good enough" for social media and web content, but lack the anatomical precision of Kling or the ultra-realism of OmniHuman. If you need 10+ talking head clips for a content series, educational course, or multi-language localization, Pixverse is the only model that makes the math work.
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