OpenAI vs Anthropic PBC

OpenAI was founded in December 2015 as a non-profit research laboratory with a $1 billion pledge from its founders — including Elon Musk, Sam Altman, and Peter Thiel. The stated mission was to ensure that artificial general intelligence benefits all of humanity rather than being controlled by any single company or government. Musk later said he co-founded OpenAI specifically because he was terrified of what Google might build.

OpenAI converted from a non-profit to a "capped profit" structure in 2019, allowing investors returns up to 100 times their investment. Microsoft invested $1 billion. Critics argued this was a non-profit in name only. By 2023, Microsoft had invested $10 billion in total, securing exclusive access to GPT-4 and integrating it across Word, Excel, Teams, and Bing. OpenAI had become the most commercially significant AI company in history — while still nominally describing itself as a safety-focused research lab.

OpenAI launched ChatGPT on November 30, 2022 as "a research preview." It reached one million users in five days. It reached 100 million users in two months — the fastest consumer product adoption in history. Google declared an internal code red. The AI era had visibly, undeniably begun. Elon Musk, who had left OpenAI's board in 2018, watched from the outside and would soon found a competitor.

On November 17, 2023, OpenAI's board fired CEO Sam Altman without warning. Within 48 hours, nearly 700 OpenAI employees signed a letter threatening to resign unless Altman was reinstated. Five days later, Altman returned as CEO. Three of the four board members who had fired him were replaced. It was the most dramatic corporate governance crisis in Silicon Valley history — and it changed nothing about OpenAI's trajectory.

OpenAI ended 2025 with over $20 billion in annualised revenue — growing at a rate the technology industry had never seen before. In March 2026, it raised $122 billion in fresh capital at an $852 billion post-money valuation, making it the most valuable private technology company in history. Sam Altman, the CEO who built all of this, owns 0% of the company. The Wall Street Journal reported in April 2026 that OpenAI had missed internal revenue targets for early 2026 and that CFO Sarah Friar had raised concerns about whether revenue could support the $1.4 trillion in AI infrastructure commitments the company had signed. OpenAI disputed the report. The tension between its commercial ambitions and its safety mission — which had led its founders to leave Anthropic — remained unresolved.

Dario Amodei was VP of Research at OpenAI in 2020, overseeing the development of GPT-3 — the most capable language model ever built at the time. He and a group of colleagues, including his sister Daniela, became increasingly concerned that OpenAI was prioritising commercial deployment over safety research. In December 2020, Dario, Daniela, and five other senior OpenAI researchers resigned. It was the largest talent departure in OpenAI's history.

Anthropic was founded in January 2021 with $124 million in seed funding and a stated mission: the responsible development and maintenance of advanced AI for the long-term benefit of humanity. The company developed Constitutional AI — a method for training AI systems to be helpful, harmless, and honest by having the AI evaluate its own outputs against a set of principles. Claude, Anthropic's AI assistant, launched in March 2023 and was designed from the ground up with safety properties its founders believed were absent from competing systems.

Amazon invested up to $4 billion in Anthropic in September 2023. Google had previously invested $300 million. The investments valued Anthropic at approximately $20 billion and came with commercial agreements: Amazon would deploy Claude across AWS; Google would integrate Claude into its cloud offerings. Anthropic's run-rate revenue was approximately $87 million in January 2024. It would grow 345x in 28 months.

Anthropic launched Claude Code — an agentic AI coding tool — publicly in May 2025. By November 2025, Claude Code alone was generating over $1 billion in annualised revenue. By February 2026, that figure had reached $2.5 billion. Anthropic's total run-rate revenue hit $9 billion by end of 2025, $30 billion by April 2026, and $47 billion in May 2026. In February 2026, Anthropic closed a $30 billion Series G at a $380 billion valuation. In May 2026, it closed a $65 billion Series H at a $965 billion valuation. Salesforce took 20 years to reach $30 billion in annual revenue. Anthropic did it in under three years from a standing start.

Anthropic filed confidentially for an IPO in June 2026, with Goldman Sachs, JPMorgan, and Morgan Stanley in early discussions for a potential public offering as early as October 2026. The company that had left OpenAI over safety concerns had built one of the most capable — and most commercially successful — AI systems in the world. Whether safety and capability were in tension, as Anthropic's founders had originally believed, or complementary, as its commercial success suggested, remained the defining question of the AI industry. Anthropic had made the question more precise. It had not yet answered it.