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In re Mosaic LLM Litigation

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Case Information
Case name In re Mosaic LLM Litigation[1]
Court U.S. District Court for the Northern District of California[1]
Docket 3:24-cv-01451-CRB (master)[1]
Filed March 8, 2024 (O’Nan action); May 2, 2024 (Makkai action)[1]
Judge(s) Charles R. Breyer; Magistrate Judge Alex G. Tse[2]
Plaintiffs Stewart O’Nan; Abdi Nazemian; Brian Keene; Rebecca Makkai; Jason Reynolds[1]
Defendants Databricks, Inc.; Mosaic ML, LLC[1]
Case type Consolidated civil copyright action[1]
Claims / issues Alleged use of copyrighted books in training Mosaic MPT and Databricks DBRX large language models[1]
Status Cross-motions for summary judgment pending; hearing scheduled for October 30, 2026.[2]

In re Mosaic LLM Litigation consolidates two author actions alleging that Mosaic ML and its parent Databricks used copyrighted books in training large language models. The plaintiffs’ allegations have not been resolved on the merits.[1]

Consolidation and amendment

The O’Nan plaintiffs filed on March 8, 2024 and the Makkai plaintiffs filed on May 2. The court consolidated the actions under the O’Nan master docket. In June 2025, Judge Charles R. Breyer allowed the plaintiffs to add a direct-infringement claim concerning Databricks’ DBRX models and to update the works at issue.[1]

The docket reflects opposing summary-judgment motions concerning infringement and fair use, with a hearing scheduled for October 30, 2026.[2]

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 N.D. Cal., order granting leave to amend, ECF 129, filed June 25, 2025, pp. 1–6
  2. ↑ 2.0 2.1 2.2 CourtListener master docket, reviewed September 22, 2026
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