December 5, 2025 (January 27, 2026)

Table of contents

  1. Available Models
  2. Quality & Duration Matrix
  3. Audio Features by Model
  4. v5.5/v5.6 Native Audio
  5. Feature Comparison
  6. Endpoint Compatibility
  7. Endpoint-Specific Constraints
  8. Quality Tier Requirements

Available Models

Model Description
v5.6 Latest model with audio generation
v5.5 Audio generation
v5 Lip sync TTS, sound effects
v5-fast Fast generation, no audio features

Quality & Duration Matrix

All models support duration 1-10 seconds, except:

  • 1080p is limited to 1-8 seconds maximum
  • create-frames endpoint is limited to 1-8 seconds
Quality Duration Range Notes
360p 1-10s All tiers
540p (default) 1-10s All tiers
720p 1-10s Standard+
1080p 1-8s Pro/Premium

Audio Features by Model

Model Audio Feature Usage
v5.6 Integrated audio audio: true
v5.5 Integrated audio audio: true
v5 Lip sync + Sound effects lip_sync_tts_prompt + sound_effect_prompt
v5-fast None No audio support

v5.5/v5.6 Native Audio

Models v5.5 and v5.6 feature integrated audio generation - voice, lip sync, and background music are generated together with the video in a single step.

{
  "model": "v5.6",
  "audio": true,
  "prompt": "A woman says hello and waves at the camera"
}
v5.5/v5.6 Audio v5 Audio
Use audio: true Use lip_sync_tts_prompt + sound_effect_prompt
Voice integrated with video Separate lipsync step available
Background music auto-generated Manual via sound_effect_prompt
Lipsync endpoint not supported Lipsync endpoint supported

Feature Comparison

Feature v5.6 v5.5 v5 v5-fast
Native Audio ✅ ✅ - -
Lip Sync TTS - - ✅ -
Sound Effects - - ✅ -
Duration 1-10s ✅ ✅ ✅ ✅
Preview Mode ✅ ✅ ✅ ✅

Endpoint Compatibility

Endpoint v5.6 v5.5 v5 v5-fast
POST videos/create ✅ ✅ ✅ ✅
POST videos/create-frames ✅ ✅ ✅ ✅
POST videos/create-transition
(2-frame)		 ✅ ✅ ✅ -
POST videos/create-transition
(3+ frame)		 - - ✅ -
POST videos/extend - ✅ ✅ -
POST videos/modify - ✅ - -
POST videos/upscale ✅ ✅ ✅ ✅
POST videos/lipsync - - ✅ -
POST videos/create-fusion - - ✅ -

Endpoint-Specific Constraints

Endpoint Supported Models Max Duration Max Quality
create v5.6, v5.5, v5, v5-fast 10s (8s@1080p) 1080p
create-frames v5.6, v5.5, v5, v5-fast 8s 1080p
create-transition
(2-frame)		 v5.6, v5.5, v5 8s 1080p
create-transition
(3+ frame)		 v5 only 8s 1080p
extend v5.5, v5 10s (8s@1080p) 1080p
modify v5.5 only source video 720p
lipsync v5 only source video source
fusion v5 only 10s (8s@1080p) 1080p

Quality Tier Requirements

  • 360p: All subscription tiers
  • 540p: All subscription tiers (default)
  • 720p: Standard or higher
  • 1080p: Pro/Premium