Compare real per-second AI video costs across six major models for HK creators. Benchmarks for social ads, hero videos, and e-commerce production.
AI video production costs have shifted dramatically in late 2026. Six months ago, the choice was simple — pick one model and pay per generated clip. Today, Hong Kong creators face six major video generation models with vastly different pricing, output quality, and production-fit profiles. This guide breaks down the actual cost per second of usable footage for each model.
Per-Model Cost Benchmarks
The cost of one second of AI-generated video ranges from $0.12 to $1.80 depending on the model, resolution, and generation settings.
FLUX 3 Video — $0.15 per second of usable footage at standard quality. Black Forest Labs' model produces 20-second clips with native audio at $0.60 per generation. Accounting for a 45-55% keeper rate, each usable second costs roughly $0.15. For Hong Kong social media ads requiring 10-15 second spots, expect $1.50-$2.25 per finished clip before retakes. The native audio output eliminates a separate voiceover generation step worth $0.03-$0.08 per clip in practice.
Kling 3.0 — $0.08 per second at 720p, the most cost-effective option for rapid prototyping. Kuaishou's model generates 5-second clips at $0.40 per generation with an approximate 60% keeper rate. For agencies producing 30-50 test variations, Kling 3.0 keeps iteration costs manageable at $2-$3 for a full round of testing.
Veo 3.1 — $1.20-$1.80 per second at 1080p, the premium tier. Google's model produces cinema-grade output with sophisticated camera motion, but at $0.50-$0.75 per generation and a 40% keeper rate, the cost adds up quickly. A single 15-second hero spot costs $18-$27 in generation fees. This makes sense only for marquee projects where the client has approved the premium route.
Seedance 2.5 — $0.30 per second at 1080p with native audio. ByteDance's one-pass video-and-audio model runs $1.20 per generation with a 55% keeper rate. The built-in Cantonese voiceover support makes this particularly attractive for Hong Kong production teams.
LTX-2.5 — $0.06 per second, the cheapest option by a wide margin. The open-weight model runs on consumer GPUs with no per-generation fee. A single RTX 4090 generates a 5-second clip in about 45 seconds at roughly $0.05-$0.08 in electricity. The trade-off is quality — LTX-2.5 lags behind commercial models in motion coherence and prompt adherence. It excels as a storyboarding tool where volume matters more than polish.
Wan3.0 — $0.22 per second at 720p. Alibaba's model generates 30-second clips from text or reference images at $1.00 per generation with a 50% keeper rate. The longer generation window means fewer total generations for a finished project.
MiniMax H3 — $0.45 per second with native stereo audio. The omni-modal model generates 15-second clips at $0.80 per generation with a 55% keeper rate. For music video concepts where sound design and visuals must sync, H3 eliminates a secondary audio production step worth $50-$150 per project.
Production Cost Scenarios
Social media ads (10-15 second spots): Choose Kling 3.0 for volume testing ($3-$5 for 3-5 variants) and FLUX 3 Video for the final pick ($1.50-$2.25). Total cost: $5-$7 per published ad, down from $15-$20 six months ago.
Brand hero video (30-60 seconds): Seedance 2.5 or Veo 3.1 for primary footage ($25-$55), with Kling 3.0 or LTX-2.5 for B-roll ($3-$8). Total: $30-$65 per finished minute.
E-commerce product showcase (15-20 seconds): Wan3.0 excels here — the longer generation window and reference-image input produce consistent product shots. Expect $5-$8 for a final clip. For bulk catalogs (50+ SKUs), MiniMax H3's native audio saves the separate voiceover, bringing per-SKU cost to $4-$6.
Prototyping and pitch decks: LTX-2.5 wins at $0.06 per second. A storyboard of 20 five-second clips costs roughly $6 in compute, versus $40-$60 on commercial APIs.
Choosing the Right Model for Your Budget
The cheapest per-second rate does not always produce the cheapest finished project. Three factors determine real cost: keeper rate, revision rounds, and post-production overhead.
LTX-2.5 offers the lowest sticker price but requires the most retakes. Seedance 2.5 costs more per second yet produces usable output more consistently. Veo 3.1 is the most expensive, yet for high-stakes client work where a single 15-second hero spot commands $5,000+, the generation cost ($18-$27) is negligible.
Hong Kong agencies serving HSBC, Hong Kong Tourism Board, or Lee Kum Kee should budget a blended rate: 70% of runtime from a mid-tier model (FLUX 3 Video or Seedance 2.5) for primary content, 20% from a budget model (Kling 3.0) for supporting shots, and 10% from a premium model (Veo 3.1) for hero moments. This brings the blended cost to roughly $0.20-$0.35 per second — a 40-60% reduction from early 2026 prices.
Frequently Asked Questions
Q: Which AI video model has the lowest cost per second? A: LTX-2.5 at roughly $0.06 per second, running on consumer GPUs. However, it is best suited for pre-visualisation rather than client-ready deliverables.
Q: How does native audio affect production costs? A: Models with native audio (FLUX 3 Video, Seedance 2.5, MiniMax H3) eliminate a separate voiceover or sound design step worth $50-$150 per project, making their effective cost lower than the per-second rate suggests.
Q: Is Veo 3.1 worth the premium price? A: For hero content and high-stakes client projects, yes. The generation cost of $18-$27 for a 15-second spot is negligible compared to a traditional production day in Hong Kong ($3,000-$8,000). For routine social content, Kling 3.0 or FLUX 3 Video offer better value.
Q: How many retakes should I budget for? A: Budget for 2-3 generations per usable clip with any commercial model. LTX-2.5 may require 4-5 attempts. Account for keeper rates: Veo 3.1 at 40%, FLUX 3 Video at 45-55%, Kling 3.0 at 60%, Seedance 2.5 at 55%.
Q: Can I mix footage from different models in one project? A: Yes. The most cost-effective approach is blending models: use Veo 3.1 or Seedance 2.5 for key scenes and Kling 3.0 or FLUX 3 Video for transitions. Slight visual differences are manageable with colour grading.
Q: How much does AI video production cost for a Hong Kong tourism board project? A: For a 60-second tourism spot, expect $40-$70 in generation fees plus post-production ($200-$500). Total: $250-$570, down from $800-$1,500 in early 2026.
Q: Is there a free option for AI video generation? A: Kling 3.0 provides 3-5 free clips per day. Open-weight models like LTX-2.5 are cost-free beyond compute expenses.
Q: Which model is best for Cantonese-language voiceover? A: Seedance 2.5 generates native Cantonese audio with the video, making it the most efficient choice for localised Hong Kong content.