> ## Documentation Index > Fetch the complete documentation index at: https://docs.goenhance.ai/llms.txt > Use this file to discover all available pages before exploring further. # MiniMax-H3-Flex > MiniMax-H3-Flex is a faster MiniMax H3: same inputs, same price, and in our tests each video finishes in about 70% of the time `hailuo_h3` takes. It follows motion and action in the prompt more closely (spins, jumps, a move between the first and last frame), while keeping the same text-to-video, first / last frame and audio-driven lip sync features. Pass `image_url` for a first frame, optionally with `image_end_url` for a last frame. For reference-driven generation use the `hailuo_h3_refs` model instead. **Pricing** — billed per second, by resolution: | Resolution | Tokens / sec | USD / sec | |---|---|---| | 480p | 1.5 | $0.03 | | 720p | 3 | $0.06 | | 2K | 4.5 | $0.09 | All resolutions support 5–15 seconds. **Audio-driven lip sync** — pass `audio_url` (optionally with `audio_start`) and the characters sing or speak along with your audio. The model generates only the picture; the video's soundtrack is your audio clip, and the video lasts exactly `duration` seconds as long as the audio covers it. It works with text-to-video, a first frame, or first + last frames. Billed the same as without audio. Returns an `img_uuid`; poll GET /api/v1/jobs/detail (or use `custom_callback_url`) to get the generated video. ## OpenAPI ````yaml api-reference/video-generations/openapi-minimax-h3-flex.json POST /api/v1/videos/generations openapi: 3.1.0 info: title: GoEnhance API - MiniMax H3 Flex description: Video generation with MiniMax H3 Flex. version: 1.0.0 servers: - url: https://api.goenhance.ai security: [] paths: /api/v1/videos/generations: post: tags: - VideoGenerations summary: MiniMax-H3-Flex description: >- MiniMax-H3-Flex is a faster MiniMax H3: same inputs, same price, and in our tests each video finishes in about 70% of the time `hailuo_h3` takes. It follows motion and action in the prompt more closely (spins, jumps, a move between the first and last frame), while keeping the same text-to-video, first / last frame and audio-driven lip sync features. Pass `image_url` for a first frame, optionally with `image_end_url` for a last frame. For reference-driven generation use the `hailuo_h3_refs` model instead. **Pricing** — billed per second, by resolution: | Resolution | Tokens / sec | USD / sec | |---|---|---| | 480p | 1.5 | $0.03 | | 720p | 3 | $0.06 | | 2K | 4.5 | $0.09 | All resolutions support 5–15 seconds. **Audio-driven lip sync** — pass `audio_url` (optionally with `audio_start`) and the characters sing or speak along with your audio. The model generates only the picture; the video's soundtrack is your audio clip, and the video lasts exactly `duration` seconds as long as the audio covers it. It works with text-to-video, a first frame, or first + last frames. Billed the same as without audio. Returns an `img_uuid`; poll GET /api/v1/jobs/detail (or use `custom_callback_url`) to get the generated video. parameters: - name: Authorization in: header description: '' required: false example: '{{Authorization}}' schema: type: string requestBody: content: application/json: schema: type: object properties: model: type: string enum: - minimax-h3-flex description: Model name. Must be `minimax-h3-flex`. prompt: type: string maxLength: 7000 description: >- Text prompt describing the video. Required. Max 7000 characters. image_url: type: string format: uri description: >- Optional first-frame image. JPG/PNG/WEBP/AVIF, ≤10MB, shortest side ≥300px. When provided, runs image-to-video and the output ratio follows the image. image_end_url: type: string format: uri description: >- Optional last-frame image (same limits as image_url). Must be used together with image_url. resolution: type: string enum: - 480p - 720p - 2K default: 2K description: >- Output resolution. Also sets the price — see the pricing table above. 2K takes longer than 720p. duration: type: integer minimum: 5 maximum: 15 default: 5 description: Video duration in seconds. Any integer from 5 to 15. ratio: type: string enum: - '21:9' - '16:9' - '4:3' - '1:1' - '3:4' - '9:16' default: '16:9' description: >- Aspect ratio. Text-to-video only; ignored when image_url is provided (the ratio then follows the input image). audio_url: type: string format: uri description: >- Optional. Drives the video with this audio: the characters lip-sync to it, and the output's soundtrack is the audio clip from `audio_start` to `audio_start + duration`. Pass the whole song or speech track; it does not need to be pre-cut. MP3/WAV/M4A/AAC/FLAC/OGG, ≤50MB. Works with text-to-video, image-to-video and first/last frame. No extra charge. audio_start: type: number minimum: 0 default: 0 description: >- Optional. Where to start reading `audio_url`, in seconds (decimals allowed). Must be used together with `audio_url`. The audio left after `audio_start` must cover `duration`: a shortfall of less than one second is accepted (the video then ends with the audio); anything more is rejected before tokens are charged. custom_callback_url: type: string format: uri description: >- Optional. A publicly accessible HTTPS URL. When the task status changes (processing / success / failed), GoEnhance sends a POST request to this URL. The request body is identical to the response of GET /api/v1/jobs/detail. If your server does not respond with HTTP 200, the notification is retried up to 3 times, with a 3-second timeout per attempt. example: https://your-server.com/goenhance/callback required: - model - prompt examples: textToVideo: summary: Text-to-video value: model: minimax-h3-flex prompt: A boy playing basketball by the sea duration: 5 ratio: '16:9' firstLastFrame: summary: First and last frame value: model: minimax-h3-flex prompt: >- She bites the paper pizza, spins once on the spot, then jumps through the torn red paper and lands laughing with the pizza held overhead image_url: https://example.com/first.jpg image_end_url: https://example.com/last.jpg duration: 5 resolution: 720p lipSyncShot: summary: First and last frame + audio (lip sync) value: model: minimax-h3-flex prompt: >- The woman sings to the camera with emotion, the camera slowly pushes in to a close-up, the background stays the same image_url: https://example.com/first.jpg image_end_url: https://example.com/last.jpg audio_url: https://example.com/song.mp3 audio_start: 13 duration: 10 resolution: 720p responses: '200': description: '' content: application/json: schema: type: object properties: code: type: integer msg: type: string data: type: object properties: img_uuid: type: string cost: type: number description: >- Tokens deducted for this request. This is the amount actually charged, so it already reflects any discount active on your account and can be lower than the listed price. Tokens are deducted when the task is accepted, and refunded automatically if the generation ends in failure. example: 5.82 required: - img_uuid - cost required: - code - msg - data examples: '1': summary: Success value: code: 0 msg: Success data: img_uuid: c12b656c-747a-44fd-9c80-add79b0c52d5 cost: 5.82 '2': summary: Insufficient tokens value: code: 100 msg: tokens is not enough quota: summary: API key quota exceeded value: code: 101 msg: 'API key quota exceeded: 4990 of 5000 tokens used (monthly)' headers: {} '401': description: '' content: application/json: schema: type: object properties: code: type: integer msg: type: string required: - code - msg headers: {} deprecated: false security: [] ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.