Merge Gateway adds multimodal inputs

Multimodal support turns Gateway from a model router into a broader production layer for AI applications, though developers should verify modality support and pricing per provider route.

• –Unified access reduces provider-specific integration work for vision, video, and audio features
• –Intelligent routing and fallback can keep multimodal workloads available during provider outages or throttling
• –Model capability differences still make testing essential, especially for video and audio understanding
• –A single API simplifies switching providers as multimodal models evolve