Sierra releases τ-bench 2.0.0 with six language packs and frozen voice and text benchmarks

Sierra's τ-bench repository published τ-bench 2.0.0, which its release notes date October 19, 2026 and title "Multilingual and Voice". The notes say a --language option now selects one of six language packs (English, Spanish, Portuguese, Hindi, Chinese and Korean) with localized databases, tasks and caller personas for the airline, retail and telecom domains, and that frozen, pinned benchmark manifests such as voice-v2 and text-v1 replace ad-hoc task selection. The release also adds an intake domain for entity capture, a post-hoc tau2 judges suite that the notes say is diagnostic only, and 2.0 leaderboard submission packages. The notes state that 2.0 results are not comparable with 1.x results and point to the v1.0.1 tag for comparable runs. USASI has not tested this release.1

USASI. (2026, October 21). Sierra releases τ-bench 2.0.0 with six language packs and frozen voice and text benchmarks. United States of America Superintelligence. https://unitedstatesofamericasuperintelligence.com/news/tau-bench-2-0-0-released/

@misc{usasi_news_tau_bench_2_0_0_released,
  author = {{USASI}},
  title = {Sierra releases τ-bench 2.0.0 with six language packs and frozen voice and text benchmarks},
  year = {2026},
  month = oct,
  howpublished = {\url{https://unitedstatesofamericasuperintelligence.com/news/tau-bench-2-0-0-released/}},
  note = {United States of America Superintelligence. Last updated 2026-10-21}
}