Claude Opus 5.5 video generation: how it works and how to make your first MP4

Since Anthropic released Claude Opus 5.5 on 22 September 2026, "Opus 5.5 video" has turned into one of the more searched AI-video topics. Developers have been sharing short explainers, showreels and motion graphics they made by simply asking the model for a video. If you are wondering whether you can do the same for your product or brand, this page explains how it actually works, where it shines, and how to get a finished MP4 in a few minutes.

Does Claude Opus 5.5 generate video?

Not in the way text-to-video models do. Opus 5.5 does not output video pixels, and Anthropic's launch page doesn't list video generation as a feature. What it does extremely well is write code — and a video can be code:

1. The model writes an animation as HTML, CSS and JavaScript (or React with Remotion, or HTML with HyperFrames).
2. A headless browser such as Chrome draws every frame of that animation.
3. FFmpeg stitches the frames into an MP4.

So when people say "Opus 5.5 made this video", they mean Opus 5.5 wrote a small program, and the program rendered the video. As one write-up put it, you ask for a video and get a program you can edit.

Why this approach is good for marketing videos

Code-rendered video has real advantages over generated footage for ads and social content:

• Text is perfect. Headlines, prices and captions are real fonts, not AI-drawn letters, so nothing is misspelled or warped.
• It's exact and repeatable. The same file renders the same video every time. Changing "slow down scene two" is an edit and a re-render, not a new roll of the dice.
• Every format from one file. 9:16 for TikTok and Reels, 4:5 and 1:1 for feeds, 16:9 for YouTube — just change the ratio.
• Every language. Swap the copy and render again; Chinese, Japanese, Korean and right-to-left text work like any web page.
• Your brand, not a lookalike. Your logo, colours, product photos and screenshots go straight in.
• No per-video fees. Rendering happens on your own machine. You pay only for the model's tokens.

What it is not good at: realistic people, live-action scenes or camera footage. For those you still need a camera or a video-generation model.

What Opus 5.5 is good at making

The formats that work best are the ones built from type, shapes, images and screenshots:

• Short social hooks — text-message stories, notes-app lists, word-by-word hook text
• Product videos — spotlight reveals, spec callouts, before/after sliders
• App and SaaS promos — phone mockup scrolls, 3D screenshot showcases, what's-new cards
• Explainers and data — hand-drawn steps, stat reveals with a chart
• Brand pieces — logo stings, kinetic typography films, offer-first sale ads

Two ways to do it

1. From scratch: just ask

Open Claude Code (or any agent running Opus 5.5) in an empty folder and describe the video. The model will typically write an HTML animation and a render script, install Puppeteer or Playwright, and run FFmpeg. This works, and it's a great way to explore — but expect to spend a few rounds on timing, frame capture, fonts and encoding settings, and the result is different every time you start over. Long, open-ended video sessions can also use a lot of your plan's usage.

2. With a Skill: a tested template the model follows

An Agent Skill is a folder with instructions (SKILL.md), a template and scripts. When you ask for a video that matches it, Opus 5.5 loads the Skill and follows its workflow: it asks for what's missing, writes the copy for your approval, validates it, then renders with a renderer that's already been debugged. You get a consistent, on-brand result in one pass and spend tokens on your message, not on rebuilding a video pipeline.

Reelity's Skills are built exactly this way: deterministic HTML templates rendered frame-by-frame by headless Chrome and FFmpeg on your machine. Twenty of them are free.

Make your first Opus 5.5 video in five minutes

1. Requirements: Node.js 20+, Google Chrome, and an agent with Opus 5.5 — Claude Code is the easiest. Select the model with /model or claude --model claude-opus-5-5.
2. Install a Skill. Create a free Reelity account, pick a Skill on the Skills page and copy its install command into your terminal (the first run connects your account once). The Skill lands in ~/.claude/skills.
3. Ask for the video in plain words, for example:

> Make a 9:16 text-message video where a friend asks how I post five videos a day and I say my agent renders them.

1. Approve the copy. The agent shows the messages before rendering.
2. Get the files. A draft renders in seconds; then the agent renders the final MP4s (and a poster image) in every format you asked for.

The full walkthrough, with troubleshooting, is in our Opus 5.5 video tutorial.

What it costs

Anthropic prices Opus 5.5 at $4 per million input tokens and $20 per million output tokens through the API (20% below Opus 5), and it's included in Claude's paid plans within their usage limits. A Skill-based video usually needs one short conversation, because the template and renderer already exist; building a video pipeline from scratch takes many more turns. Rendering itself is free — it runs on your computer.

Tips for better results

• Name the format. "A countdown teaser for our launch on 9 April, 6 PM ET" works better than "a cool video".
• Give real inputs. Product photos with transparent backgrounds, real screenshots, your hex colours and logo.
• Ask for a draft first. Review a low-resolution draft before rendering every format.
• Keep claims true. The model will render whatever you write; prices, ratings, stats and testimonials on screen must be real. Our Skills' validators flag the common problems.
• Check the safe zone. In 9:16, keep text away from the platform's buttons — try the safe-zone checker.

FAQ

Can Opus 5.5 add music or a voiceover? The renderer can mux in a music track you're licensed to use. AI voiceover needs a separate text-to-speech service.

Does it work with Codex, Cursor or Gemini CLI? Yes. Skills are plain folders with a SKILL.md; any agent that reads them can follow the workflow. See supported agents.

Is this the same as Sora or Veo? No. Those generate footage from a prompt. Opus 5.5 writes code that renders graphics, text and your own images — better for ads, explainers and anything with exact copy.

Do I need to know how to code? No. You describe the video and approve the copy; the agent runs the commands.

Ready to try it? Start with one of the free video Skills — or read 20 simple promo video formats for ideas.