01Closed weights
United States
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OpenAI
AI research and products spanning general-purpose intelligence, coding, agents and computer use.
Closed model companies
The labs shipping frontier AI behind an API.
4 companies to know
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02Closed weights
Anthropic
United States
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Anthropic
AI safety research and products for coding, agents, reasoning and professional work.
03Closed weights
Google DeepMind
United States and United Kingdom
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Google DeepMind
Google’s AI research lab, building frontier systems across science, products, multimodality and agents.
04Closed weights
xAI
United States
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xAI
AI research and products focused on reasoning, real-time interaction, agents and exploration.