Ex-OpenAI CTO’s Startup Has the Highest Talent Density

Thinking Machines Lab, founded last year by former OpenAI Chief Technology Officer Mira Murati, has secured the top position in the inaugural Paraform Talent Density Index. 

The ranking, which evaluates technology companies based on market demand for their workforce rather than raw headcount, awarded the startup a score of 0.817.

Thinking Machines Lab employs approximately 140 people and has $2 billion in funding. The firm recruited more than 30 senior staff from competitors OpenAI, Meta AI, and Mistral. 

The startup maintained its hiring momentum despite several co-founder departures between late 2025 and early 2026. 

The report noted that for the young laboratory, “this is what it looks like when a company's entire identity is built around who's inside the building.”

The recruitment data platform Paraform developed the index using an algorithmic assessment of candidate profiles, hiring trajectories, and interview conversion patterns. “Each company is assessed across a structured set of dimensions, including the technical depth of its team, hiring trajectory, calibre of prior employers represented on staff, domain expertise concentration, and performance signals observed across the Paraform network,” says the firm. 

OpenAI ranked second with a score of 0.805 across its 4,500-person workforce. The ChatGPT developer serves as the primary training ground for the sector, supplying senior staff to nearly all top 15 firms on the list. 

Paraform observes how rare this retention is at scale, stating, “Most companies lose technical sharpness as they grow. [Organisation] layers pile up, product demands take over, and the density thins out.”

Anthropic took third place with a score of 0.802 and $64 billion in funding. The index highlighted Anthropic's ability to maintain a high company-quality score past the 1,000-employee threshold. 

Addressing the firm’s strict research focus, the authors state, “The company was uniquely built on a thesis—AI safety—that was supposed to shrink the pool. Instead, it became the magnet.”

Rounding out the top five are AI-native code editor Cursor and autonomous vehicle software provider Applied Intuition. Cursor implements rigorous hiring protocols for its 400-person team, including two-day on-site projects and a ban on AI tools during initial interviews. 

Paraform’s index evaluates 50 companies, including Decagon, Cohere, LangChain, Ramp, Cognition, and others.