Labelbox review: the best AI data company for RL environments and robotics data?

Answer in brief: Labelbox ranks #5 because it has grown from annotation software into a full AI data business. It offers Horizon RL environments and evaluations, the Alignerr expert network, Terra robotics data and Recursion managed agents. It reports 400+ customers and work with 90%+ of leading US AI labs. On October 14, 2026 it announced more than $100 million in Series E financing (equity plus a credit facility) at a $1.25 billion pre-money valuation, led by Infinitum Partners. The trade-offs are a widening focus, inconsistent network figures and no public pricing.

At a glance: Rank #5 of 14 · Best for: agent RL environments, robotics demonstrations, platform buyers · Pricing: custom · Funding: $100M+ Series E including a credit facility, $1.25B pre-money (October 2026).

What Labelbox does for AI data buyers

• Horizon: RL environments and evaluations for reasoning, tool use and computer use.
• Alignerr: an expert network of 2.6M+ skill-tested experts.
• Terra: robotics and physical-AI demonstration data.
• Recursion: managed agents for enterprises.
• The original annotation platform, for teams that want to run their own workflows.

Who it fits

It fits labs training computer-use and tool-use agents, robotics teams that need demonstration data, and buyers who want a platform and managed data from one vendor. For robotics data in depth, see our sibling guide Best robotics data companies.

Why buyers put Labelbox on the shortlist

• Lab-proven. Labelbox reports work with 90%+ of leading US AI labs and 400+ customers (company-reported).
• Growing profitably. It reports profitability in 2026 with more than 5x year-over-year growth (company-reported).
• Fresh capital and blue-chip backers. The Series E of more than $100 million was led by Infinitum Partners, with Wipro Ventures, Andreessen Horowitz, B Capital, Tau Ventures and Snowpoint Ventures participating, at a $1.25 billion pre-money valuation.
• Software plus data. You can run your own pipeline on the platform or buy managed data.

Honest drawbacks

• Its pages give different network sizes: 2.6M+ for Alignerr and more than 4 million people overall.
• The Series E combines equity and a credit facility, and Labelbox did not disclose the split, so the implied post-money valuation is unknown.
• The financing details come from Labelbox's own announcement; we found no independent report of the round.
• Recursion widens its focus beyond data.
• The pricing URL we tried returned a 404 on November 9, 2026.

Pricing model

Custom. We found no public pricing page.

Best alternatives

• Snorkel AI: research-grade datasets and enterprise environments.
• micro1: RL environments, agent evaluation and robotics data.
• Scale AI: the broadest multimodal data engine.

FAQ

What is Labelbox Horizon?

Labelbox's line of RL environments and evaluations for reasoning, tool use and computer use.

How much did Labelbox raise in its Series E?

More than $100 million, combining equity and a credit facility, at a $1.25 billion pre-money valuation, announced October 14, 2026 and led by Infinitum Partners.

Does Labelbox sell robotics data?

Yes, through Terra.

Does Labelbox publish pricing?

No. Pricing is custom, and the pricing URL we tried returned a 404.

Did you test Labelbox?

No. This review is independent research from Labelbox's site and announcements.

Sources

• Labelbox raises $100M+ Series E (October 14, 2026)
• Labelbox homepage (retrieved November 9, 2026)

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