An overview of Runway Gen-4.5, Kling 3.0, Google Veo 3.1, Luma and Pika, with plan prices and limits as of September 2026. Open-source options like Stable Video Diffusion and HunyuanVideo are also covered.
Runway Gen-4.5, Kling 3.0, Google Veo 3.1, Luma's Ray3 models and Pika 2.5 are among the most widely used AI video generators as of September 2026. Most turn a text prompt or a still image into a short clip, typically between 4 and 15 seconds long, at 720p or 1080p, with some offering 4K output or upscaling. Paid plans start at $12/month billed annually on Runway and $10/month on Pika (pricing as of September 2026).
Runway Gen-4.5 targets motion quality and prompt adherence, with 4K upscaling on paid plans. Kling 3.0 generates 3 to 15 second clips with optional native audio. Google Veo 3.1 generates video with sound in the Gemini app, Flow and the Gemini API. Luma and Pika bundle their own models with third-party models on credit plans.
Runway released Gen-4.5 on December 1, 2025. Runway reports ↗ that it ranked first on the Artificial Analysis Text-to-Video leaderboard at launch, ahead of Veo 3, Kling 2.5 and Sora 2 Pro. The platform supports text, image and video inputs, and paid plans include 4K upscaling.
Pika's current in-house model is Pika 2.5. The Pika site also lists third-party models and audio tools, including Pika SFX, Pika Speech and Pika Soundtrack, which adds synchronized sound effects, voice, music and ambience to a video. An Extend Video tool lengthens existing clips.
Kling 3.0, from Kuaishou, launched in February 2026. Kling's model guide ↗ lists clips of 3 to 15 seconds at 720p or 1080p, multi-shot sequences and an element reference system meant to keep characters and objects consistent across shots.
Luma's current video model is Ray3.2, available in the Luma app alongside partner models such as Kling 3.0 and Veo 3.1. As of September 2026, Luma's pricing page starts at the $30/month Plus plan and no longer lists a free tier.
Stable Video Diffusion is an open-weights image-to-video model from Stability AI that users run on their own hardware. It generates short clips (25 frames at 576x1024) from a single still image. There are no per-video fees, but you need a capable GPU and some technical setup.
Runway gives new accounts 125 one-time credits. Pika's free plan has no monthly credits but lets you buy credit packs. Stable Video Diffusion and HunyuanVideo cost nothing to run on your own hardware.
Free tiers are usually limited to small credit allowances, lower queue priority and non-commercial use. Luma's pricing page no longer lists a free plan as of September 2026, so check your account before relying on free generations.
Runway's free plan is a one-time 125-credit allowance rather than a monthly refill (as of September 2026). Stable Video Diffusion and Tencent's HunyuanVideo avoid recurring costs through self-hosting but require technical setup and GPU hardware.
As of September 2026, Runway charges $12 to $76/month billed annually for 625 to 9,500 credits. Luma costs $25 to $250/month billed annually for 10,000 to 150,000 credits. Pika costs $8 to $76/month billed annually. Self-hosted open models cost only hardware and electricity.
Runway's Standard plan costs $15/month, or $12/month billed annually, for 625 credits. Pro costs $35/month ($28 annually) for 2,250 credits, and Max costs $95/month ($76 annually) for 9,500 credits, per Runway's pricing page ↗ as of September 2026.
Luma's Plus plan costs $30/month ($25 annually) for 10,000 credits. Pro costs $90/month ($75 annually) for 40,000 credits, and Ultra costs $300/month ($250 annually) for 150,000 credits (as of September 2026). Credit costs per clip vary by model and resolution.
Pika's Starter plan costs $10/month ($8 annually) for 900 credits, Creator costs $35/month ($28 annually) for 3,150 credits, and Fancy costs $95/month ($76 annually) for 8,550+ credits (as of September 2026). Because credit costs differ by model, length and resolution, cost per video is best checked in each tool's calculator.
Runway's paid plans are listed as watermark-free. Pika's pricing page lists no watermark on any plan, including free. Self-hosted models such as Stable Video Diffusion add no watermark. Check commercial-use rights separately from watermarks.
Runway's Standard plan and above list "no watermarks" as of September 2026, and paid plans include 4K upscaling. The Max plan adds HDR, ProRes and image-sequence exports.
Pika's pricing page shows no watermark on its Free, Starter, Creator and Fancy plans, but commercial use is only included from the Creator plan upward (as of September 2026). Self-hosted models add no watermark because you control the generation process locally.
Commercial usage requires checking license terms for each platform. Luma includes commercial use on Plus and above. Pika includes it on Creator and Fancy.
Gen-4.5 focuses on motion quality, prompt adherence and visual consistency. The platform accepts text, image and video inputs, and paid plans add 4K upscaling. Runway's plans also give access to some third-party models such as Kling 3.0.
Runway describes Gen-4.5 as improving realistic physics, expressive characters and consistency across complex, multi-element scenes. It supports both photorealistic and stylized output.
Multi-modal inputs enable text-to-video, image-to-video and video-to-video workflows. Users upload reference images to guide style and composition. Video inputs extend existing clips or modify specific elements.
4K upscaling is included on paid plans, and the Max plan adds HDR and ProRes exports for editing workflows. Generation time depends on the model, clip length and queue load, and Runway does not publish fixed turnaround times.
Pika combines its own Pika 2.5 model with third-party video models and a set of audio tools. Pika Soundtrack generates synchronized sound for a clip. Extend Video continues clips beyond their initial length. Character Studio helps keep custom characters consistent.
Pika Speech and Pika Soundtrack add voice and sound to generated clips, so a short scene can be produced with audio in one tool rather than exported to a separate editor.
Pika describes Soundtrack as turning a video into a full-scene soundscape, with motion-aware sound effects, voice, music and ambience that follow the action.
Extend Video adds footage to existing clips while trying to keep the same visual style. Users can extend clips more than once to reach a desired length.
Kling 3.0 is built to keep characters, objects and scenes consistent across frames and across multiple shots. Its element reference system locks in character, item and scene traits. Native audio mode generates dialogue, sound effects and ambience with the video.
Kling's guide describes an element reference system that keeps the traits of characters, items and the scene stable across camera movements and scene changes. Kling positions this as a fix for characters and objects changing appearance between shots.
Multi-shot mode can plan shots automatically, or let users set the content and duration of each shot within a single clip of up to 15 seconds.
Native audio supports dialogue in Chinese, English, Japanese, Korean and Spanish, according to Kling. Kling also lists improved multi-character dialogue and better text rendering compared with earlier versions.
Google Veo 3.1 generates video with native audio at 1080p and 4K. Midjourney added image-to-video in June 2025. Tencent's HunyuanVideo is an open-source model with a newer 1.5 version released in November 2025.
Google DeepMind lists ↗ Veo 3.1 with native audio, including sound effects, ambient noise and dialogue, plus 1080p and 4K output. It is available in the Gemini app, Google Flow, Google Vids and the Gemini API.
Midjourney launched its V1 video model on June 18, 2025. It animates Midjourney images, or uploaded start frames, into four 5-second clips per job, which can be extended about 4 seconds at a time up to four times. The focus is on artistic and stylized content rather than photorealism.
HunyuanVideo is Tencent's open-source video model, released in December 2024 with over 13 billion parameters. It is a general-purpose model rather than an anime or gaming specialist. HunyuanVideo-1.5 followed on November 21, 2025.
Runway offers 4K upscaling on paid plans. Kling 3.0 outputs 720p or 1080p. Veo 3.1 supports 1080p and 4K. Stable Video Diffusion outputs 576x1024. Vendors do not publish fixed generation times.
Resolution capabilities vary between platforms. 4K (3840x2160) output or upscaling suits professional editing, while 1080p (1920x1080) is enough for most social media content.
Generation speed depends on the model, resolution, clip length and how busy the service is. Higher resolutions and native audio modes also cost more credits; on Kling, a 5-second 1080p clip with native audio costs 60 credits versus 30 for 720p without audio (as of September 2026).
Quality modes affect processing time and cost. Draft or low-resolution modes are useful for testing prompts before paying for a full-quality render.
Specific prompts including style, mood, and camera angles generate higher quality videos. Motion descriptions specify how objects and characters should move. Reference examples using "in the style of" improve consistency. Environmental details enhance scene atmosphere and lighting.
Effective prompt structure follows the format: [Subject] [Action] [Environment] [Style] [Camera Movement]. Example: "Elderly man walking slowly through misty forest, cinematic lighting, tracking shot following from behind."
Motion descriptions prevent static or unnatural movement. Specify "walking briskly," "gentle swaying," or "rapid rotation" rather than generic "moving." Camera movements like "dolly zoom," "overhead shot," or "close-up" control perspective and framing.
Reference examples improve style consistency by mentioning specific films, artists, or visual styles. "In the style of Studio Ghibli," "film noir lighting," or "documentary cinematography" guide the AI's visual interpretation.
Environmental details enhance realism through specific lighting, weather, and atmospheric conditions. Include "golden hour lighting," "heavy rain," "foggy morning," or "neon-lit street" to establish mood and visual context.
Runway, Luma and Pika all offer developer APIs. Google offers Veo through the Gemini API. Stable Video Diffusion and HunyuanVideo can be self-hosted.
Runway's API ↗ charges $0.01 per credit, with Gen-4.5 at 12 credits per second of video as of September 2026. The API also offers third-party models such as Veo 3.1.
Stable Video Diffusion and HunyuanVideo can be deployed on your own infrastructure. Developers control generation parameters, model weights and output formats, with no per-request fees.
Luma offers an API for its video models, and Pika offers API access through its developer platform. Google's Gemini API documents Veo video generation for developers.
Most tools export standard MP4 files that open in Adobe Premiere, Final Cut Pro and DaVinci Resolve.
Q: Can I use AI-generated videos for commercial purposes?
A: Luma includes commercial use on its Plus plan and above, and Pika on Creator and above (as of September 2026). Stable Video Diffusion is covered by Stability AI's license terms, and Stability's Community License allows free commercial use for individuals and organizations under $1M in annual revenue. Check each platform's current license terms before commercial use.
Q: How long can AI-generated videos be?
A: Most platforms generate clips of roughly 4 to 10 seconds. Kling 3.0 produces 3 to 15 second clips, and Midjourney clips can be extended to about 21 seconds. Longer videos are built by extending clips or editing several generations together.
Q: What hardware do I need for Stable Video Diffusion?
A: You need an NVIDIA GPU with substantial VRAM and a working Python setup. Stability AI does not list an official minimum on the model card. Larger open models need far more: Tencent recommends 80GB of GPU memory for the original HunyuanVideo, with 60GB as the minimum.
Q: Do AI video generators work with uploaded images?
A: Runway, Kling, Luma, Pika and Midjourney accept image inputs for video generation. Upload reference photos to guide character appearance, scene composition and visual style.
Q: How accurate is AI lip sync technology?
A: No vendor publishes an independent accuracy figure. Kling 3.0 generates dialogue with lip sync as part of the video in five languages, and Veo 3.1 also generates dialogue with its video. Results depend on clear prompts or audio and visible faces.
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