Kling AI said Kling 4.0 is now fully available, via @Kling_ai on X (15 October 2026, 15:00 UTC; verified via the X API on 16 October 2026). The official account post stated: “KLING 4.0 Is Now Fully Available,” with access “through a refreshed creation interface” and “through MCP and CLI for greater flexibility in your video creation workflow.”
Kling is Kuaishou’s video model product. Feature and capability claims below are Kling’s own, mainly from its 30 September 2026 product blog, which described early access then and a wider October rollout. That September post also noted Kling 4.0 Flash for Ultra Yearly subscribers from 28 September; today’s X message is the “fully available” marker for the broader product surface, not a fresh model card rewrite.
What the X post says is live today
From the verified @Kling_ai post:
- Kling 4.0 is fully available
- Access via a refreshed creation interface on Kling’s site
- Access via MCP (Model Context Protocol) and a CLI for workflows outside the standard web UI
That MCP/CLI path is the developer-facing news of the day: moving generation into assistant- and terminal-driven pipelines, not only the consumer page. MCP servers are how tools show up inside agent hosts; a CLI is how the same calls land in scripts and CI. Together they matter more for integrators than another UI refresh alone.
Feature claims from Kling’s September blog
Kling’s 30 September blog — company marketing, not an independent bake-off — says Kling 4.0:
- Generates videos up to 30 seconds in a single generation
- Supports high-quality audio and two-channel stereo, with improved lip-sync (Kling’s claim)
- Accepts up to 15 reference assets in one generation — up to 10 images, 5 videos (up to 30 seconds in total, including video subjects), and 7 subjects
- Supports up to 10 keyframe images
- Accepts prompts up to 8,000 tokens
- Supports 21:9 ultrawide
- Adds broader language, dialect and accent coverage (list on the blog)
Treat motion quality, lip-sync and “professional-grade” language as vendor claims until third-party tests land. The omni-reference limits (images + video subjects + keyframes) are the practical product differentiator Kling is selling to storyboard-heavy creators.
Still coming soon — not live yet
Kling is explicit that some headline items are not available yet:
- 10-bit HDR output at 4K and 1080p — “coming soon” on the blog
- Video extension up to 2 minutes — also marked coming soon on the blog
- API access for enterprise customers and developers — listed as coming soon in coverage of the same X announcement by RuntimeWire (15 October 2026); the verified X post’s trailing “Coming …” media/thread points at further rollout items beyond MCP/CLI
Do not describe 4K/10-bit HDR, a public API, or 2-minute extensions as shipping today. MCP and CLI availability is the live claim; HDR, long extension and a fuller API remain on the roadmap language Kling and secondary coverage used.
Context from earlier TSN coverage
Video APIs are already stitching Kling into other platforms. TSN covered Runway Dev adding Kling 2.5 Turbo Pro, Kling 3.0 and Kling O3 to its video API — a reminder that “Kling access” often arrives through a host product before the vendor’s own API is the default path. On the audio side of the same pipeline, Mirelo’s SFX 2.0 showed how post tools are racing to replace or rebuild a clip’s sound while keeping dialogue. Kling’s own MCP/CLI launch sits in that tooling race: generation first, then sound and edit stages around it.
Why it matters
Video models are racing from chat-box demos to tool-shaped interfaces. Shipping MCP and CLI access is how Kling plugs into agentic editing stacks — the same pattern TSN has covered when Runway Dev added Kling models to its API. Creators get a refreshed UI; integrators get protocol and terminal hooks while waiting on HDR and a fuller API. For newsrooms and production shops, the practical question is whether MCP/CLI rate limits and auth match production batch work, or whether teams still queue through the web UI until the enterprise API lands.
What’s still unknown
- Exact MCP server and CLI package names, auth model and rate limits
- Pricing for Kling 4.0 versus Flash / Ultra tiers after full availability
- When the “coming soon” HDR, API and 2-minute extension items ship
What to watch
Watch Kling’s developer docs and subsequent @Kling_ai posts for API GA and HDR launch notes. Also watch whether third-party hosts (Runway and others) update which Kling 4.0 surfaces they expose once MCP/CLI are public.
What this means
- Fully available, per Kling’s verified X post, including MCP and CLI.
- Capability numbers are Kling’s (30s native, omni reference limits, 8k-token prompts).
- Still coming soon: 10-bit HDR 4K/1080p, ~2-minute extension, and (per secondary reading of the launch) API access.
Sources
- Kling AI (@Kling_ai) on X, “KLING 4.0 Is Now Fully Available”, 15 October 2026 (verified via X API)
- Kling AI blog, “Introducing Kling 4.0: Visual Realism, Creative Control, and Next-Level Storytelling”, 30 September 2026
- RuntimeWire, Ryan Merket, “Kling AI makes Kling 4.0 available through MCP and CLI”, 15 October 2026
Related stories
- Runway Dev Adds Kling 2.5 Turbo Pro, Kling 3.0 and Kling O3 to Its Video API
- Mirelo Launches SFX 2.0, an AI Model That Replaces a Video’s Sound While Keeping the Dialogue
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