Kling 4.0 Flash is the fast tier of Kuaishou's Kling 4.0 lineup: text-to-video, image-to-video from a first frame, and Omni Reference, at 3–20 seconds and 720p. Flash opened to early-access users on September 28, 2026 and has no public API yet. It is coming to reAPI; Kling 3.0 Turbo is live today.
Kling 4.0 Flash is the lighter, faster version of Kling 4.0, Kuaishou's fourth-generation AI video model. Kling's September 28, 2026 release note describes it as built for frequent creation, combining fast generation with reliable quality. The official Kling 4.0 Flash spec sheet lists text-to-video, image-to-video from a first frame, Omni Reference, 3–20 second clips, 720p output, and 8-bit SDR. Flash went to a limited early-access group on September 28, while the full Kling 4.0 is scheduled for October. As of October 1, 2026, Kling's API changelog has no Kling 4.0 Flash entry, so there is no public API for it yet.
Real-world workflows and production use cases you can build and ship with this model.
Kling built Kling 4.0 Flash for frequent creation. Use it to test a prompt, a camera move, or a pacing idea at 720p, then spend the bigger render on the take that works. It is the same draft-then-deliver loop people already run with Kling 3.0 Turbo, one generation newer.
Kling 4.0 Flash generates 3–20 second clips, five seconds more than the 15-second cap on Kling 3.0 and Kling 3.0 Turbo. A short ad, a product turn, or a four-beat scene fits in one Kling 4.0 Flash generation instead of two stitched clips.
Give Kling 4.0 Flash a first frame and it animates from that image, or add references through Omni Reference to keep a character or product on-model. Early testers report good motion and prompt understanding, with element consistency better than earlier Kling models but not perfect.
Kling 3.0 Turbo is live on reAPI now at /models/kling-3-0-turbo: fast text-to-video and image-to-video at 720p or 1080p. Ship on it today and switch to Kling 4.0 Flash when it can be called.
Your reAPI key already covers Kling, Seedance, Veo, Wan, and the rest. When Kling 4.0 Flash goes live, it is a new model id on the same /api/v1/videos/generations endpoint, not a new vendor account or a yearly plan.
reAPI bills by the second of output, and credits never expire. Rates will be posted on this page at launch; Kuaishou has not published API pricing for Flash yet.
Both are the fast tier of their Kling generation. Kling 3.0 Turbo values are from the live model on reAPI; Kling 4.0 Flash values are from Kling's official September 28, 2026 spec sheet.
Kling 4.0 Flash values are from Kling's official release note and may change before an API ships. This table will be updated with API parameters at launch.
Sign up and create a key in the dashboard, no card required. The same key will work for Kling 4.0 Flash at launch.
OpenWire up /api/v1/videos/generations with model kling-3-0-turbo today. The request and task flow will be the same for Kling 4.0 Flash.
OpenWhen Kling 4.0 Flash goes live, change the model to kling-4-0-flash. Final parameters and per-second rates will be posted here on launch day.
Opencurl -X POST https://reapi.ai/api/v1/videos/generations \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "kling-4-0-flash",
"prompt": "A clay lighthouse keeper climbs a spiral staircase at night"
}'Rejected synchronously with the failing field named. Check enum values, ranges, and URL fields — nothing is charged.
401 means a missing or invalid Bearer key; 402 means the reserve exceeds your balance. Manage keys and credits in the console.
Reference material and outputs pass automated moderation. Rejected tasks fail with a clear error and a full refund.
A task that reaches a failed state is never charged — the reserve refunds automatically. Keep the task id and retry when ready.
Common questions about this model.
Guides
Kling 4.0 Flash is in early access, but is there a Kling 4.0 Flash API? What Kling's API docs, price sheets, and changelog show, and what to build on today.
Comparisons
A Kling 4.0 Flash review roundup: what early testers praise (motion, voices, 20s clips), what breaks (music, shot cuts, wide shots), and how it compares.
Guides
The Kling 4.0 release date is October 2026, with Kling 4.0 Flash in early access since September 28. Official specs vs the leak, and when the API arrives.
Guides
Kling 3.0, 3.0 Omni, 3.0 Turbo, O1, 2.6, and 2.5 Turbo compared on duration, resolution, audio, and references, plus which Kling model fits each job.
Try it in the playground or grab an API key to integrate now.
