Pika H3 Flex

Generate a video with native audio from ordered image, video and audio references. Choose any whole-second duration from 5 to 15, 480p or 768p resolution, and one of 11 aspect ratios. Prompt rewriting is enabled by default; set rewrite=false to use the original prompt. 1080p/2k/4k generates at 768p and upscales once with Pika Upsampler V1, preserving audio and frame rate. Combined pricing is per actual output second; the quote reserves the native frame-count duration bound. Reference video seconds are billed at the same rate in addition to output seconds; image and audio references add no duration charge.