Tau2 Bench (Prime Intellect)

τ²-bench evaluation environment

Type: RL Env
Publisher: Prime Intellect
Tags: Tau2 V1 Tool Agent User Tool Use User Sim
Runtime: tool-use
License: unknown
Size: v0.3.1
Published: Sep 2025
Updated: Sep 2026
Canonical: app.primeintellect.ai/dashboard/environments/primeintellect/tau2-bench

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Attribution

README: api.primeintellect.ai/api/v1/environmentshub/primeintellect/tau2-bench/@0.2.3/inspect

Lift evidence

Eval	Tools known to lift	Source paper
Tau2	Tau2 Bench (Prime Intellect)	-

Same problem set, this tool's harness. Run it to score a model on the test.

Sierra

Sierra's dual-control extension of τ-bench - now the user is also an LLM and both agents share access to the same tool-driven environment.