Claude Code artifacts, Cursor canvases, Codex Sites: what each one shares

A year ago, sharing what a coding agent made meant pasting it into a chat message and hoping the formatting survived. This year all three big agents grew a share button, within weeks of each other. Claude Code publishes artifacts, Cursor shares canvases, and Codex builds Sites.

I build a fourth thing, so I read all three sets of documentation with the attention of someone checking whether they still have a job. This post is what each one actually shares, who can open it, and what it costs, from the vendors' own docs as they stood on 27 September 2026. My own product gets the same table and the same questions, and it loses some of them.

🖼️ Claude Code: artifacts

An artifact is "a live, interactive web page that Claude Code publishes from your session to a private URL on claude.ai". You ask for one, or Claude decides the output suits a page, and it publishes. Ask for a change and it republishes to the same address, and each publish becomes a version.

Who can open it depends on your plan. On Pro and Max, "a public link is the only way to share an artifact", and anyone can open that link without signing in. On Team and Enterprise, sharing stays inside the organisation until an Owner turns on external sharing, which is off by default.

Three limits worth knowing before you rely on it:

• It needs a paid plan, Pro or above, and a session signed in with /login. A session running on an API key, or through Bedrock, Google Cloud or Foundry, cannot publish.
• It is one self-contained page. The docs call it "a capture of work", and say so under a heading titled "What an artifact is not".
• Changing it goes through Claude. Even a teammate you make an editor publishes a new version by giving Claude the address, not by typing into the page.

For an annotated diff, a dashboard or four layouts side by side, this is the best of the three. It is also free with the plan you already pay for, which is a price I find hard to beat.