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sierra-researchWhat its open source looked like when it raised

τ-Bench: A Benchmark for Tool-Agent-User Interaction in Real-World Domains

Website
www.taubench.com
Repository
sierra-research/tau2-bench
First commit
Stars today
1,944
Forks
491

The round

Funding announced 4 May 2026

$950M
Source: company announcement, sierra.ai

The repository was 11 months old on the day the round was announced.

Measured by us

GitHub stars, 2 Feb 2026 – 3 Sep 2026

30 observations · every few days

8601,1701,4801,780 4 May 2026 — round announced 1,097 1,944 MarAprMayJunJulAugSep
Stars, observed directly by us Funding announcement

What the curve says

The announcement did not visibly change the slope

In the 87 days to 30 Apr 2026 the repository added 396 stars. In the 91 days after, it added 600 — a rate 1.4× higher.

1,097
stars on 30 Apr 2026, the last reading before the round
4.6/day
2 Feb 2026 – 30 Apr 2026, before
6.6/day
30 Apr 2026 – 30 Jul 2026, after

What this does not show

  • Stars measure attention, not revenue, adoption or retention.
  • The series starts on 2 Feb 2026, when we began observing this repository. Earlier history exists only as a monthly reconstruction and is deliberately not plotted with it.
  • A single launch post can produce a step like this without any change in usage.

We were tracking sierra-research/tau2-bench 91 days before this round was announced.

Finding companies at that stage is the product. Contributor pedigree, enterprise-demand signals and our ranking sit behind the login.

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