Checked fact 34733 Nov 2026Money and compute

The S-1/A says that over 90% of the contributions to Anthropic's codebase in September 2026 were written by Claude.

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The exact words it rests on

For example, over 90% of the contributions to our codebase in September 2026 were written by Claude.

What the source said when we opened it, on 3 Nov 2026.

The source

Anthropic, PBC Amendment No. 1 to Form S-1 (filed 2 Nov 2026)
U.S. SEC / Anthropic, PBC · 2026-11-02

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Checked by the notis newsroom on 3 Nov 2026, against the source above.

In the story

Anthropic's amended S-1 reports a $567 million operating loss, blaming short-term compute 3 Nov 2026

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“The S-1/A says that over 90% of the contributions to Anthropic's codebase in September 2026 were written by Claude.” ai notis, checked 3 Nov 2026. Source: Anthropic, PBC Amendment No. 1 to Form S-1 (filed 2 Nov 2026) (U.S. SEC / Anthropic, PBC). https://ainotis.com/c/3473

As a reference (APA style)

ai notis. (2026, November 3). The S-1/A says that over 90% of the contributions to Anthropic's codebase in September 2026 were written by Claude [Checked claim 3473]. ai notis. https://ainotis.com/c/3473

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