Google reports 52.3% for Gemini 4 Hydrogen on Vals AI's Tax Agent Bench and says that ranks first overall, citing Vals AI.
Limits: Provider-reported: Google publishes the result for its own model; it has not been independently reproduced here. Google says this score comes from a third-party leaderboard; that leaderboard was not opened here, so its run date, harness and settings are unverified. The figure appears only in Google's launch post, not in the model card table or evaluation methodology. Google says the scores are as of November 2026 for the model it calls Gemini 4 Hydrogen; equivalence to the build now served on every surface is not established. Results under the same benchmark name can be shown together as reported scores, but unmatched settings and missing methods rule out a controlled ranking.
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