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Labelbox

Data major offering RL gyms and simulated enterprise apps (Horizon, WorldSim)

Data majorTool useComputer useApp replicasCoding and SWE

Labelbox’s Horizon offers RL training gyms and evals for reasoning, tool use and computer use. WorldSim builds the enterprise apps and business data agents work in, such as GitLab, Jira, CRM, email and chat, with hundreds of MCP tools and software-generated environments tuned to target pass@k. It says it became profitable in 2026.

Best for: Simulated enterprise app stacks with many MCP tools

$100M+ Series E incl. credit facility (Oct 2026)

  • ✓ Bespoke builds
  • – Platform or hub
  • – Open source
  • – Publishes prices
Visit Labelbox

Facts checked November 9, 2026 against the sources listed below. Labelbox does not pay to appear here.

1 Legal nameLabelbox, Inc.
2 HeadquartersNot disclosed
3 FoundedNot disclosed
4 TeamNot disclosed
5 DeliveryBespoke builds
6 ExclusivityNot disclosed
7 Customers and partnersSays it works with 90% of frontier AI labs and hyperscalers; its named case studies (Meta, Google Cloud) are not about RL environments.
8 Published pricesNot disclosed

Worth knowing before you sign

  • The Series E headline includes a credit facility, so it overstates equity raised
  • No lab is named as an RL-environment customer
  • No public RL-environment benchmark found

Go to Labelbox's site

Sources

  1. Labelbox Horizon
  2. Labelbox homepage
  3. Labelbox: Series E
  4. Labelbox: Series D
  5. CB Insights financials
  6. multiples.vc profile

Work at Labelbox? Send corrections with a source to editors@toprlenvironments.com. We fix verified errors within five business days.

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