AI CSS Animations

Guides · · Maxwell Prehoda

Claude vs ChatGPT for Animation: 13 Jobs, and Which One to Hand Each To (2026)

Short answer: for animation you build as code (CSS, SVG, canvas, three.js, React), Claude currently leads the public front-end leaderboard and is the stronger default; for animation you generate as video, ChatGPT is the only one of the two with a video model, Sora 2. Most real projects need one of those two jobs, so the useful question is which job you have. The 13 entries below break it down by task, with the tool or feature to use and the catch.

A disclosure, because it matters here: our Animation Studio runs on Claude and our coding connector is for Claude Code, so read our view with that in mind. That is why every claim below points to an outside source: Arena's crowdsourced WebDev leaderboard, Simon Willison's public tests, and each company's own documentation, all checked in late October 2026. The last two entries are ours.

1. Arena WebDev leaderboard: Best for a neutral read on front-end code quality

Platform: arena.ai, crowdsourced votes, free

Arena's WebDev board ranks models on front-end web development tasks from pairwise votes, with bootstrapped confidence intervals. On the 27 October 2026 update, with 952,039 votes across 153 models, Claude Opus 5.5 (Max) was first at 1810, OpenAI's GPT-6 Astra (Max) second at 1773 and Claude Sonnet 5.5 (xHigh) third at 1770, with Google's Gemini 4 Carbon close behind.

Front-end tasks are the closest public proxy for animation code, because most web motion is HTML, CSS and JavaScript. The 37-point lead at the top is clear; the gap between second and fourth is within the noise.

Watch out for: Votes reflect what people prefer at a glance, not whether an animation is smooth, accessible or maintainable. Use the board to shortlist, then test on your own component.

2. Claude Artifacts: Best for seeing a CSS animation run inside the chat

Platform: Claude apps, Free to Enterprise plans

Artifacts open beside the conversation and update live as you work, and Claude can make one out of almost anything, including code snippets, single-page websites, diagrams and small interactive tools. For animation that means you describe a loader or a hover, see it running, and ask for "slower ease-out" without leaving the chat.

They are available on Free, Pro, Max, Ultra, Team and Enterprise plans, and in Claude Code, but they need the "Cloud code execution and file creation" setting turned on.

Watch out for: A live preview is not your production stack. Paste the result into your real page before trusting the timing; fonts, sizes and neighbouring styles change how motion feels.

3. ChatGPT Sites: Best for hosting an animated page built in ChatGPT

Platform: ChatGPT and Codex, hosting included with plans

OpenAI's Sites lets you build, host and share a website by describing it in ChatGPT or Codex, then refine it by asking for changes. You can also host web apps, games or a compatible project you have already built, without a separate deployment setup, and hosting is free through 31 December 2026.

For an animated landing page, a game-like toy or a motion prototype you want to send to someone, that is the shortest path from prompt to public URL on the OpenAI side.

Watch out for: Hosted pages lock you into the platform's hosting rules. If the animation will end up in your own site, ask for plain HTML and CSS you can move.

4. Claude Code: Best for adding motion to an existing codebase

Platform: Terminal, IDE, desktop app and web

Claude Code reads your codebase, edits files and runs commands from the terminal, VS Code, JetBrains, a desktop app or the browser. For animation work the useful parts are CLAUDE.md (where you can write your easing and duration rules once), skills for repeatable motion tasks, MCP connections to design tools, and a Chrome integration for debugging live web apps.

Simon Willison's write-up of October 2026 game projects credits Claude Opus 5.5 with a step change in design quality, and suggests moving to Codex once a project passes the proof-of-concept stage, so agents on both sides are in play.

Watch out for: An agent will happily animate everything. Put your motion rules (which properties, which durations, reduced-motion behaviour) in CLAUDE.md before you start.

Claude Code in Chrome ↗

5. Codex and the ChatGPT browser: Best for checking rendered motion in a built-in browser

Platform: ChatGPT desktop app, Codex CLI, IDE and Cloud

Codex runs in the ChatGPT desktop, mobile and web apps, the Codex CLI, an IDE extension and Codex Cloud. Its built-in browser, in the ChatGPT desktop app, lets you open a local route next to the code diff; with Computer Use the agent can click, type, take screenshots and check its own work, and an optional developer mode inspects console output, the DOM and applied styles.

Seeing the page is what animation work needs most, so a browser in the loop matters more than any benchmark. OpenAI says GPT-6.1 Terra is available in ChatGPT Work and Codex on Plus, Pro, Business, Enterprise and Edu plans.

Watch out for: The browser is only in the ChatGPT desktop app, not the CLI or IDE extension. Screenshots also miss timing: ask for a short screen recording or step through frames when easing matters.

6. Sora 2: Best for generated video, not code

Platform: OpenAI, Sora 2 video model

This is the clearest difference between the two. OpenAI has a video model, Sora 2, with an official prompting cookbook and API sample apps. Anthropic's documentation says every current Claude model supports text and image input with text output, so Claude does not render video itself; when it makes motion, it writes the code that draws each frame.

Pick Sora for live-action-looking clips, moods and b-roll. Pick a code route (Claude or ChatGPT) for UI motion, type, charts, diagrams and anything that has to match a brand exactly or be edited later.

Watch out for: Generated video is pixels: you cannot change one word, one colour or one timing without regenerating. Check usage rights and likeness rules before using it in client work.

Claude models overview ↗

7. Simon Willison: the October inflection point for vibe game development: Best for 3D and game-like animation in the browser

Platform: simonwillison.net, hands-on write-up

Willison built several browser games in October 2026, including a multiplayer RTS called Battle Drones, and credits Claude Opus 5.5 as the model behind the jump: Claude "is capable of building full-color 3D models that look and feel excellent." He tried the same RPG with GPT-6 Pro and found it "looks great, but I don't think it plays nearly as well," and judged GPT-6 Astra "not quite there yet" for fun.

He recommends three.js for 3D. For animators the takeaway is that both can make it look good; the difference he saw was in feel, which is exactly what motion is about.

Watch out for: This is one experienced developer's playtesting, not a benchmark. Your results will depend on the prompt, the library and how much you iterate.

8. The pelican-on-a-bicycle SVG test: Best for a quick SVG sanity check on any new model

Platform: simonwillison.net, public runs

Willison runs the same prompt, "Generate an SVG of a pelican riding a bicycle", on nearly every new model, at several reasoning levels, and publishes the images side by side. Recent runs include OpenAI's GPT-6.1 Terra on 26 October 2026 and Claude Haiku 5.5 on 7 October 2026.

SVG is the raw material of much web animation, so the test is a fast way to see whether a model can draw coherent shapes before you ask it to move them. Run your own version with the object you actually need.

Watch out for: Willison calls it a "deeply unscientific benchmark", and it tests drawing, not animation. Treat a nice pelican as a pass, not a ranking.

9. Sekondo for After Effects and Premiere: Best for After Effects users who want either assistant

Platform: Adobe plugin, macOS and Windows

Sekondo connects ChatGPT and Claude to six Adobe apps, including After Effects and Premiere Pro. Instead of generating new clips, it works inside your own project, editing layers, keyframes, compositions and timelines while leaving everything editable, and it runs with the Claude and ChatGPT desktop apps. Motionographer covered the launch.

If your animation lives in After Effects, this makes the Claude vs ChatGPT choice a setting rather than a migration: try both on the same comp and keep the one whose edits you undo less.

Watch out for: It is a third-party plugin distributed on Adobe Exchange. Test it on a copy of a project first, and check how it handles your expressions and pre-comps.

Motionographer coverage ↗

10. Remotion: Best for React-based video with any coding agent

Platform: React video framework, docs built for agents

Remotion turns React components into video, and its documentation is "optimized for AI agents": add .md to any doc URL, or request text/markdown, and agents such as Claude Code fetch the markdown version automatically. That makes it a neutral target for either assistant when you want code-built video you can render and re-render.

It suits product videos, data-driven clips and anything where the content changes but the template does not.

Watch out for: Rendering video from React needs a working Node and headless browser setup, and you should read Remotion's licence terms before building a commercial pipeline on it.

11. Design Arena: Best for comparing models on your kind of animation

Platform: designarena.ai, crowdsourced, free

Design Arena calls itself the largest crowdsourced benchmark for AI-generated design, with categories that include websites, code art, code to video, SVG, UI components, data visualisation and 3D assets. You submit a prompt, compare outputs from different models and vote.

Because you choose the category and the prompt, it is the closest thing to testing Claude and ChatGPT on your own animation brief without paying for both.

Watch out for: Crowd votes reward first impressions. Judge motion by watching it twice and checking the code, not by the thumbnail.

12. Our creator for CSS keyframes: Best for production-ready CSS animation without prompt craft

Platform: Motions, try a full run free Ours

Describe an animation or paste your own component (HTML or a screenshot), answer up to four quick questions while it takes shape, and get production-ready CSS keyframes. You can refine it in chat, export it and save it; a full run is free to try, and copy, export, save and refine come with the plans.

It exists because the hard part of asking any model for animation is the brief: timing, easing, what moves and what stays still. The questions do that part for you. For prompts that work in plain Claude or ChatGPT, see our Claude animation prompts.

Watch out for: It makes web animation (HTML and CSS), not video. For scenes and MP4 export, use the Animation Studio instead.

13. Motions for Claude Code: Best for Claude Code with a real snippet library

Platform: Motions Pro plan, connects to Claude Code Ours

Connects Claude Code to the whole Motions catalog, about 1,800 copy-paste HTML and CSS animations with reduced-motion guards, plus the Motion Prompts collection, so it can search for a real, tested snippet and drop the code into your project instead of improvising one.

Use it when you want consistency across a product: the same loaders, toggles and transitions everywhere, adapted to your stack, rather than a new invention every time you ask.

Watch out for: It is for Claude Code only. If your team works in Codex, browse the free directory and paste snippets in by hand.

How to choose between Claude and ChatGPT for animation

Decide by the output you need, then by where you work, then test on your own brief.

Match it to the output

Code you will ship (CSS, SVG, canvas, three.js, React): Claude is the stronger default on Arena's WebDev board and in Willison's game tests, with ChatGPT close behind. Generated video: ChatGPT, via Sora 2, because Claude does not output video. Keyframes in After Effects: either, through a plugin like Sekondo.

Match it to where you work

In a chat window, Claude Artifacts show the animation running next to the conversation; ChatGPT Sites hosts the result for you. In a codebase, Claude Code and Codex both edit files and run commands; Codex has a built-in browser in the ChatGPT desktop app, and Claude Code has a Chrome integration. Pick the one your team already pays for before switching for a few points on a leaderboard.

Match it to your own test

Give both the same brief: one real component, exact timing, easing and reduced-motion behaviour. Judge the motion by watching it, then read the code for compositor-friendly properties (transform and opacity) and a prefers-reduced-motion guard. Ten minutes of this beats any ranking. Our guide to the best AI animation tools covers the wider field.

Run the test this afternoon

Pick one animation you actually need, paste the prompt below into Claude and ChatGPT, and compare the two results in your real page. Keep the one that needs fewer corrections.

If you would rather skip the prompt writing, our creator asks the questions for you and returns production-ready CSS keyframes you can refine and export.

A prompt to start from 
Write a CSS-only animation for [element, e.g. a primary button's loading state] in this markup: [paste HTML].
Animate only transform and opacity. Duration [e.g. 900ms], easing cubic-bezier(0.22, 1, 0.36, 1), looping until a .done class is added, then a 200ms ease-out into a check mark.
Expose two custom properties for colour and size.
Add a prefers-reduced-motion rule that replaces the motion with a static state and a 150ms opacity fade.
Return one HTML block and one CSS block, no JavaScript.

Make your own with AI →

Common questions

Is Claude or ChatGPT better at writing CSS animations?

On Arena's crowdsourced WebDev leaderboard (27 October 2026), Claude Opus 5.5 ranks first for front-end tasks, ahead of GPT-6 Astra in second. In practice both can write good CSS animations; the difference shows in how often you need to correct timing, easing and structure.

Can Claude make animated videos?

Not directly. Anthropic's documentation lists text and image input with text output for every current Claude model. Claude makes animation by writing code (HTML, CSS, SVG, canvas, three.js, React) that you can render to video with tools like Remotion or our Studio.

Can ChatGPT make animations?

Yes, in two ways: it writes animation code like Claude does, and OpenAI's Sora 2 model generates video. Code is editable and brand-exact; generated video is fast for moods and footage but cannot be changed frame by frame.

Which AI is best for After Effects?

Both can write expressions and scripts. A plugin such as Sekondo connects ChatGPT and Claude to After Effects and Premiere Pro, editing layers and keyframes in your own project, so you can compare them on the same comp.

Which is better for SVG animation?

Test it yourself with a drawing you need. Simon Willison's pelican-on-a-bicycle prompt is a quick public sanity check run on most new models, and Design Arena has an SVG category where you can compare models side by side.

Sources