{"schema":"postcutoff/model@1","as_of":"2026-10-25T23:49:00+01:00","url":"https://postcutoff.com/m/kling-4-0/","md":"https://postcutoff.com/m/kling-4-0/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"kling-4-0","name":"Kling 4.0 (and 4.0 Flash)","org":"Kuaishou","family":"Kling 4","released":"2026-10-15","status":"current","type":"video-gen","modality_in":["text","image","video"],"modality_out":["video","audio"],"open_weights":false,"model_license":"proprietary","context_window":null,"max_output":null,"knowledge_cutoff":null,"pricing":{"per_second_720p":0.157,"per_second_1080p":0.235,"unit":"USD per second of output on fal (kling/v4/text-to-video, image-to-video and reference-to-video, read 2026-10-25); reference-to-video with video references $0.094 / $0.141 per s, billed on input plus output length (minimum 2x the output). Kling's own API price not found","source":"https://fal.ai/models/kling/v4/image-to-video"},"price_line":"$0.157 per second 720p","access":[{"provider":"fal.ai","model_id":"kling/v4/image-to-video","endpoint":"https://queue.fal.run/kling/v4/image-to-video","docs":"https://fal.ai/models/kling/v4/image-to-video/api"},{"provider":"fal.ai","model_id":"kling/v4/text-to-video","endpoint":"https://queue.fal.run/kling/v4/text-to-video","docs":"https://fal.ai/models/kling/v4/text-to-video/api"},{"provider":"fal.ai","model_id":"kling/v4/reference-to-video","docs":"https://fal.ai/models/kling/v4/reference-to-video/api"},{"provider":"fal.ai (Omni video edit)","model_id":"kling/v4/video-to-video/edit","docs":"https://fal.ai/models/kling/v4/video-to-video/edit"},{"provider":"fal.ai (4.0 Flash)","model_id":"kling/v4/flash/text-to-video","docs":"https://fal.ai/models/kling/v4/flash/text-to-video"},{"provider":"Web app","url":"https://kling.ai"}],"capabilities":[{"name":"30-second single-pass clips","detail":"Native generation of up to 30 s in one pass (Kling 3.0: 15 s); fal's endpoints take 3-30 s, 720p or 1080p, with per-shot multi-prompts.","first":false,"discovered":"launch","source":"https://bernama.com/en/press/news.php?id=2622471"},{"name":"Omni Reference with keyframes","detail":"Up to 15 reference assets and up to 10 keyframe inputs per generation (Kuaishou release); start and end frame on image-to-video.","first":false,"discovered":"launch","source":"https://bernama.com/en/press/news.php?id=2622471"}],"entry":"2026-09-28-kling-4-0","notes":"Unveiled 2026-09-28 (Lite/Flash for annual subscribers), official launch 2026-10-15 per Kuaishou's Oct 19 release, open to all users on klingai.com from ~Oct 16 (Pandaily: with audio, MCP and CLI hooks). Kling's own developer API for 4.0 was reported as 'coming soon' by third-party trackers (creaa.ai, wireflow, Oct 16); not checked on Kling's JS-rendered docs. fal's v4 endpoints (OpenAPI schema read 2026-10-25) expose no audio parameter, so audio via fal is not confirmed. Not yet on the Artificial Analysis text-to-video or image-to-video boards (read 2026-10-25), so it has no independent rank; Kling 3.0 Pro is the boards' 1000 anchor. 4K and 10-bit HDR availability reported inconsistently.","verified":"2026-10-25","body_md":"Kuaishou's Kling 4.0 video model: up to 30 s per pass, up to 15 references and 10 keyframes. Through fal it is an async queue call (submit, then poll the request id).\n\n```bash\ncurl -X POST https://queue.fal.run/kling/v4/image-to-video -H \"Authorization: Key $FAL_KEY\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"start_image_url\":\"https://example.com/character.png\",\"prompt\":\"she turns and walks toward the camera\",\"duration\":5,\"resolution\":\"1080p\"}'\n```\n\nSources: https://bernama.com/en/press/news.php?id=2622471 · https://fal.ai/models/kling/v4/image-to-video · https://fal.ai/models/kling/v4/text-to-video · https://fal.ai/models/kling/v4/reference-to-video · https://technode.com/2026/10/16/kling-ai-4-0-suggests-a-shift-in-ai-video-competition-from-visual-quality-to-directorial-control/ · https://creaa.ai/blog/kling-4","page_url":"https://postcutoff.com/m/kling-4-0/","standing":{"kind":"video generation","newer_count":1,"newer":[{"id":"flux-3-max","name":"FLUX 3 Max","org":"Black Forest Labs","released":"2026-10-19","page_url":"https://postcutoff.com/m/flux-3-max/"}],"before":{"id":"kling-3-0","name":"Kling 3.0 (VIDEO 3.0 / 3.0 Omni)","org":"Kuaishou","released":"2026-02","page_url":"https://postcutoff.com/m/kling-3-0/"},"after":null,"weights":"closed","licence":"proprietary","licence_permissive":false,"summary":"Closed weights; access is hosted only."}}