ByteDance Seedance Video Generation Models Launch on B.AI API

On October 28, 2026, B.AI announced the official integration of ByteDance's Seedance video generation model family into its developer API with full platform support. The rollout gives developers programmatic access to four distinct tiers ranging from flagship multimodal generation to budget-conscious prototyping models.

Image source: @BAI_AGI (https://x.com/BAI_AGI/status/2115374231194337344)

The release addresses different workload requirements across speed, fidelity, and operational budget, spanning Seedance 2.5, Seedance 2.0, Seedance 2.0 Fast, and Seedance 2.0 Mini.

Flagship Models: Seedance 2.5 and 2.0 Capabilities

The two flagship tiers focus on extended runtimes, advanced multimodal conditioning, and high-resolution output.

• Seedance 2.5: Serves as the flagship option focused on multimodal audio-visual joint generation. It supports continuous single runs up to 30 seconds at up to 1080p 10-bit resolution. The model can incorporate up to 50 reference assets simultaneously and supports targeted timestamp editing for granular sequence adjustments.
• Seedance 2.0: Focuses on high-fidelity output supporting up to 4K 10-bit resolution with audio-video synchronization. It provides explicit control over start and end frames, along with forward and backward timeline extension to stitch and expand clips.

Both flagship tiers provide production-grade output parameters but require higher computational overhead and distinct parameter handling.

Lightweight and Production Tiers: Fast and Mini

For high-throughput iterations and cost-sensitive testing, B.AI added two streamlined models.

• Seedance 2.0 Fast: Balances generation latency and inference cost, producing output rapidly at 480p and 720p. This tier targets ad variation generation, rapid prototyping, and storyboard iteration where fast turnaround outranks peak resolution.
• Seedance 2.0 Mini: Operates at a lower unit price to support budget-constrained creation and exploratory prompt testing, allowing teams to validate ideas before committing compute to higher tiers.

Developer Access and Evaluation Workflow

Developers with active B.AI API credentials can invoke all four models through standard API endpoints. For pre-deployment testing and direct evaluation, B.AI has also made the model family accessible via its chat portal at chat.b.ai/chat.

Because resolution boundaries, generation duration limits, and conditioning capabilities differ strictly across tiers, integration pipelines should map workloads directly to model specifications—allocating Seedance 2.5 for multi-asset long takes, 2.0 for 4K sync tasks, and Fast or Mini for drafts and iterative review.

Sources

• TechFlow: ByteDance Seedance Series Video Generation Models Launch on B.AI API
• B.AI Official X (@BAI_AGI): 2026-10-28 Seedance Integration Announcement