Labelbox review: a training data company with software and experts in one
Answer in brief: Labelbox suits teams that want platform software and an expert workforce from the same vendor. Its products are Horizon (RL environments and evals for post-training across reasoning, tool use and computer use), Terra (egocentric and teleoperated robotics demonstrations), the Alignerr expert network (2.6M+ skill-tested experts across 200+ domains) and Recursion (background engineering agents). On October 14, 2026 it announced a $100M+ Series E at a $1.25B pre-money valuation. Buying is sales-led. This review is independent research from public sources.
Best-for verdict: strong option for LLM post-training environments when you want tooling plus people. Visit Labelbox →
What Labelbox does for training data buyers
- Horizon: RL environments and evals for post-training. Its WorldSim builds the environments.
- Alignerr: experts who write rubrics, preferences and demonstrations used as training signal.
- Terra: robotics data from pre-training to evals, captured on purpose-built rigs. For a deeper robotics comparison, see our sibling site Best robotics data companies.
- Recursion: agents that run evals, diff training data and fix regressions in the background.
- Research: benchmarks such as EchoChain, an audio benchmark for full-duplex dialogue.
Who it fits
Labelbox fits labs buying RL environments and expert preference data, and ML teams that want data operations and engineering agents from one vendor.
Why it stands out
- Named customer stories. Meta (the GIM reasoning benchmark), Google Cloud (human preference signal for LLM evaluation in Vertex AI) and Intuitive Surgical (surgical instrument tracking in video).
- Momentum. The Series E was led by Infinitum Partners, with a16z, B Capital and Wipro Ventures participating. Labelbox says it became profitable in 2026, grew more than 5x year over year and has 400+ customers (company claims).
- Lab penetration. Labelbox says over 90% of leading U.S. AI labs work with it (a company claim).
The catches
- Sales-led buying. Its public pricing page is gone.
- Split focus. The homepage now leads with Recursion agents, and its current site no longer foregrounds computer-vision labeling.
- Funding detail. The $100M+ includes a credit facility, and Labelbox did not disclose the split.
Pricing
Custom, scoped by sales.
Best alternatives to Labelbox
- Surge AI, our LLM post-training winner.
- Toloka, for agent RL gyms with a self-serve platform.
- Scale AI, our computer-vision winner, if perception labeling is the job.
Labelbox FAQ
What is Alignerr?
Alignerr is Labelbox's expert network, with 2.6M+ skill-tested experts across 200+ domains, according to Labelbox.
How much did Labelbox raise in its Series E?
More than $100 million, including equity and a credit facility, at a $1.25B pre-money valuation (October 2026).
Does Labelbox have public pricing?
No. Buying now goes through sales.
Sources
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