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Two sources agree. Wikipedia's[2][3] History of general relativity says "on 25 November 1915, Einstein presented the updated Einstein field equations to the Prussian Academy of Sciences", and the Wikisource translation of the paper itself carries the publication header: presented at the session of 25 November 1915 and printed in Preussische Akademie der Wissenschaften, Sitzungsberichte, 1915 (part 2), pages 844-847.
Dates the presentation to the Prussian Academy and explains what forced the revision: an earlier version was inconsistent with observation, and the final equations relate the Einstein tensor to the stress-energy tensor.[1]
Describes what the equations say - they "relate the geometry of spacetime to the distribution of matter-energy within it" - and that they were published by Einstein in 1915 as a tensor equation.[1]
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