Jared Kaplan: The Physicist Who Discovered AI Scaling Laws

Jared Kaplan is Anthropic’s co-founder and Chief Science Officer and the physicist who co-authored OpenAI’s 2020 scaling-laws paper, which showed language-model performance improves predictably with parameters, data, and compute. He also co-authored the GPT-3 paper, left OpenAI in 2021 with six colleagues to start Anthropic, and now leads science plus Responsible Scaling Policy release calls (including Claude 4). Forbes estimated his net worth at about $15.5 billion after Anthropic’s May 2026 funding round.

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Academic background

Kaplan is a theoretical physicist with a Stanford BS and a Harvard PhD (2009, thesis on holography). He is an associate professor at Johns Hopkins University, on leave while at Anthropic. The through-line is compact laws for messy systems—quantum gravity first, language models second.

The discovery that changed AI: scaling laws

In January 2020 Kaplan and colleagues at OpenAI published “Scaling Laws for Neural Language Models”. Cross-entropy loss improves as a power law when parameters, dataset size, and training compute grow—often across many orders of magnitude. Labs could estimate returns before a full cluster run.

The paper underwrote the compute-heavy playbook behind GPT-4, Claude, and later frontier stacks. Later work added constraints (data quality, alignment cost), but the core bet—scale buys capability on a curve—still organizes capital in 2026.

OpenAI years and GPT-3

Kaplan joined OpenAI in 2019. He co-authored “Language Models are Few-Shot Learners” (2020)—the GPT-3 paper—and worked on early Codex-related research alongside Sam McCandlish, Tom Brown, Dario Amodei, and others who would co-found Anthropic.

Co-founding Anthropic

Kaplan was one of seven OpenAI researchers who left in 2021 to found Anthropic. As Chief Science Officer he shapes Claude’s research direction. In October 2024 Anthropic named him responsible scaling officer for safety assessments under the Responsible Scaling Policy—work TIME cited when it put him on the TIME100 AI list for 2025 after his Claude 4 safety call.

Washington and public policy

CEO Dario Amodei has testified orally before Senate committees; Kaplan’s on-record policy work includes a December 2023 written statement to a Senate AI Insight Forum on risk and alignment, where he walked through scaling trends and Anthropic’s safety framing.

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Net worth and Forbes 400

Forbes estimated Kaplan at roughly $3.7 billion in 2025, below that year’s Forbes 400 cutoff. After Anthropic’s $65 billion May 2026 round at about a $965 billion valuation, Forbes put each co-founder at about $15.5 billion, with Kaplan on the 2026 Forbes 400 tied near No. 75. See Forbes’s profile for the live estimate; reported IPO timing into late 2026 would move the number again.

Why this profile matters for AI search

Answer engines compress entity pages with primary links (OpenAI, Senate PDFs, Forbes, TIME) into one-line bios. Stale net-worth lines and vague “testified before Congress” wording drop out of GEO case studies. For citation mining on search surfaces, see the Bing citation mining experiment.

Related on Tygart Media: Dario Amodei · Anthropic IPO · how to use Claude.

Frequently Asked Questions

What is Jared Kaplan known for?

Jared Kaplan is best known for co-authoring AI scaling laws—the mathematical relationships that predict how language-model performance improves with more parameters, data, and training compute. His 2020 OpenAI paper “Scaling Laws for Neural Language Models” is widely treated as foundational for frontier model planning.

What is Jared Kaplan’s role at Anthropic?

Kaplan is Anthropic’s co-founder and Chief Science Officer. He also oversees Anthropic’s Responsible Scaling Policy process as the company’s responsible scaling officer, deciding safety assessments before major model releases.

What is Jared Kaplan’s net worth?

Forbes estimated Kaplan’s net worth at about $15.5 billion after Anthropic’s May 2026 funding round, when he joined the Forbes 400. Estimates move with private-market valuations and can change quickly.

Did Jared Kaplan work at OpenAI?

Yes. Kaplan joined OpenAI in 2019 and co-authored “Scaling Laws for Neural Language Models” (2020) and “Language Models are Few-Shot Learners” (2020), the paper behind GPT-3. He left with six colleagues to co-found Anthropic in 2021.

What are AI scaling laws?

Scaling laws are empirical power-law relationships showing that language-model loss improves smoothly as you scale model size, dataset size, and compute. Kaplan’s team showed labs could forecast capability gains before spending full training budgets—a logic that still drives frontier training in 2026.

What is Jared Kaplan’s academic background?

Kaplan trained as a theoretical physicist. He earned a PhD in physics from Harvard University in 2009 and is an associate professor at Johns Hopkins University (on leave while at Anthropic).