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How to use Kling 4.0 in ChatGPT

ChatGPT cannot emit Kling 4.0 files on its own. Connect Flow AI Fx MCP, sign in, and ask for Kling 4.0 with length, resolution, and references.

Kling 4.0 on Flow AI Fx is 3–30 seconds at 720p or 1080p, with image and video references. ChatGPT needs the Flow AI Fx MCP at https://flowaifx.app/mcp before it can call generate_video with model id kling-v4. A 5-second 720p clip costs 400 credits.

MCP URL and install command

Paste the URL into Claude connectors or ChatGPT custom MCP. For Claude Code, Codex, and OpenClaw, run the command then sign in.

MCP URL

https://flowaifx.app/mcp
Open the web studio

Add Flow AI Fx

One Streamable HTTP URL. Sign in with Google or email. No fal, Kling, or Google AI Studio keys.

  1. 1. Add a custom MCP connector

    In ChatGPT, add a custom MCP connector / app. URL https://flowaifx.app/mcp. There is no separate ChatGPT-only endpoint.

  2. 2. Sign in

    Complete the browser sign-in with Google or email.

  3. 3. Start a new chat

    Start a new chat so tools/list is loaded, then name the model in your request.

  4. 4. Generate

    Ask ChatGPT to call generate_video and poll check_job. When credits run out, open the returned topup_url.

Generate with Kling 4.0

Connect the MCP, name the model, then poll check_job for the CDN link.

  1. 1

    Add the ChatGPT connector

    Add a custom MCP connector / app in ChatGPT pointing at https://flowaifx.app/mcp.

  2. 2

    Sign in and start a new chat

    Finish the browser sign-in, then start a new chat so generate_video is available.

  3. 3

    Name Kling 4.0

    Ask for Kling 4.0. Include 3–30s duration, 720p or 1080p, aspect ratio, and any image or video references.

  4. 4

    Generate and poll

    ChatGPT calls generate_video with kling-v4 and polls check_job. A 5s 720p job costs 400 credits.

Kling 4.0 on Flow AI Fx

Numbers match the live credit table. Failed server-error generations are refunded.

Model id
kling-v4
MCP tool
generate_video
Duration
3–30s
Resolution
720p, 1080p
Example cost
5s 720p: 400 credits

Questions

Setup, credits, and model ids for this agent combo.

ChatGPT does not output Kling files by itself. Add Flow AI Fx as a custom MCP connector with URL https://flowaifx.app/mcp, complete sign-in, start a new chat, and ask for Kling 4.0 (model id kling-v4).

More agent setups

Same model on another client, or another model on this client.

Generate Kling 4.0 from your agent

Connect https://flowaifx.app/mcp, sign in with Google or email, and call generate_video. ChatGPT, Claude, and Gemini signups start with 50 free credits. Other new accounts start with 10. When credits run out, MCP returns topup_url https://flowaifx.app/pricing?billing=payonce.

Open the web studio