On December 5, 2025, Elon Musk said X would open-source its entire codebase by Jan 31, 2026. It only partly happened. Verdict as of November 15, 2026: partly delivered.
Partial — algorithm only (Jan 20 2026). Fetched Nov 15 2026: GitHub xai-org/x-algorithm README is still “X For You Feed Algorithm” (latest notable update Oct 26 2026 Brazil-election filter removal). It is not the full X production codebase. Status stays partial. GitHub xai-org/x-algorithm README, fetched Nov 15 2026 ↗
X open-sourced only its recommendation algorithm in March 2026 — after the Jan target and far short of 'literally all of the @X codebase, nothing left out.'
| Date said | What he said | Deadline given | Source | Outcome |
|---|---|---|---|---|
| “Twitter will publish tweet recommendation code & make account/tweet status visible no later than next month. Transparency builds trust.” | Feb 28, 2023 | @elonmusk, 2023-01-13 | Delivered · Late · 31 days late | |
| “hopefully by next month, we should be able to open source literally all of the @X codebase. Nothing left out at all.” | Jan 31, 2026 | @elonmusk on X | Partial · on time |
“Twitter will publish tweet recommendation code & make account/tweet status visible no later than next month. Transparency builds trust.”
What happened: Musk promised the recommendation code no later than February 2023. Twitter published it on GitHub on March 31 2023, a month late. TechCrunch Mar 31 2023 — Twitter reveals its algorithm ↗
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