Pika H3 Flex (pikah3flex.app) is an AI video studio for short scenes with synchronized audio from text, keyframe images, or reference media. Choose duration, aspect ratio, and resolution; see credit cost before you create. Text and image modes cost 2/4/7/8/16 credits per second at 480p/768p/1080p/2K/4K; prompt refinement adds 4 credits; reference mode uses a higher rate with a fixed 15-second input allowance when video references are included. 480p and 768p are native; higher resolutions use an upscale (Draft to Video) that preserves scene and audio. Video duration is 5–15 seconds. Confirmed provider failures restore credits; timed-out jobs stay saved in My videos.