In the Voxtral paper's Table 3, Gemini 2.5 Flash had a word error rate of 14.79 percent on CHiME-4.

Quote found word for word on the live source, last checked October 19, 2026

In the source's own words

“Model LS-C LS-O GS VP SB C-4 SPGI E21 10m E22 10m ... Gemini 2.5 Flash 2.97 6.15 10.99 7.84 9.57 14.79 4.00 8.09 10.80”

Voxtral, Mistral AI, arXiv (Audio and Speech Processing), 2025, Table 3 (short-form English), CHiME-4 column.

What it measures: Table 3 of the paper gives word error rate for each English test set. The paper calls the Voxtral results macro-averages in its figures, and this row is one test set.
What it does not show: One paper's runs under its own text normalization and decoding, so compare systems within this table, not with other papers' numbers. The paper gives no date per row.

A row of Speech Recognition Accuracy: Word Error Rates, as Gemini 2.5 Flash, CHiME-4 English: 14.79 percent.