Anthropic raises $580M Series B to advance AI safety and interpretability research (2022)
Anthropic raised $580 million in a Series B round in April 2022, led by Sam Bankman-Fried of FTX, to fund large-scale infrastructure for AI safety research. The company, then ~40 people, outlined work on interpretability, steerability, and robustness of large language models. The round is historically notable both for Anthropic's early safety-focused mission and for the involvement of Sam Bankman-Fried, who was later convicted of fraud in the FTX collapse.
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Anthropic raises $124M Series A to build reliable, steerable AI systems
Anthropic announced a $124 million Series A round in May 2021, led by Jaan Tallinn with participation from Dustin Moskovitz, Eric Schmidt, and others. The company, founded by Dario and Daniela Amodei, plans to use the funding for computationally-intensive research into large-scale AI systems that are steerable, interpretable, and robust. The round represents Anthropic's founding-era capital raise, establishing its research agenda around AI safety, interpretability, and human feedback integration.
Anthropic raises Series E at $61.5B post-money valuation
Anthropic has closed a $3.5 billion Series E round at a $61.5 billion post-money valuation, led by Lightspeed Venture Partners with participation from Bessemer, Cisco, Fidelity, General Catalyst, Salesforce Ventures, and others. Proceeds will fund next-generation AI system development, expanded compute capacity, mechanistic interpretability and alignment research, and international expansion. The raise follows the launch of Claude 3.7 Sonnet and Claude Code, with Anthropic citing strong enterprise adoption across customers including Cursor, Zoom, Snowflake, Pfizer, and Amazon's Alexa+.
Anthropic launches initiative to fund third-party AI safety evaluations
Anthropic announced a funded initiative to source third-party evaluations measuring advanced AI capabilities and safety risks, with priority areas including cybersecurity, CBRN threats, model autonomy, national security risks, social manipulation, and misalignment. The initiative is tied to Anthropic's Responsible Scaling Policy and AI Safety Level (ASL) framework, aiming to address a gap between demand and supply of high-quality safety-relevant evals. Proposals are solicited via an application form, with Anthropic framing the effort as benefiting the broader AI safety ecosystem rather than just internal use.
Anthropic raises $450M Series C led by Spark Capital with Google and Salesforce participation
Anthropic announced a $450 million Series C funding round led by Spark Capital, with participation from Google, Salesforce Ventures, Sound Ventures, and Zoom Ventures. Proceeds will fund expansion of Claude-based products, enterprise API growth, and AI safety research including alignment techniques. The announcement also highlights a 100K context window feature for Claude and notes Yasmin Razavi of Spark Capital joining the board. This is a historically significant funding round for a frontier safety-focused AI lab, though it predates the much larger rounds that followed.
Anthropic raises $13B Series F at $183B post-money valuation
Anthropic completed a $13 billion Series F round led by ICONIQ, Fidelity, and Lightspeed, valuing the company at $183 billion post-money. The company reports run-rate revenue grew from ~$1 billion at the start of 2025 to over $5 billion by August 2025, serving over 300,000 business customers. Claude Code, launched in May 2025, is already generating over $500 million in run-rate revenue with usage growing more than 10x in three months. Proceeds will fund enterprise capacity expansion, safety research, and international growth.
Anthropic and Menlo Ventures launch $100M Anthology Fund for AI startups
Anthropic has partnered with Menlo Ventures to launch the Anthology Fund, a $100 million initiative financed by Menlo to support startups building on Anthropic technology. Target investment areas include AI infrastructure, healthcare, education, scientific research, consumer AI, and trust and safety tooling. Backed startups receive access to Anthropic products, $25,000 in model credits, and venture support from Menlo. The fund represents Anthropic's effort to expand its ecosystem and accelerate adoption of Claude-based applications.
Anthropic raises $65B in Series H funding at $965B post-money valuation
Anthropic has closed a $65 billion Series H round led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital, valuing the company at $965 billion post-money. The company reports annualized run-rate revenue crossing $47 billion and highlights major compute expansion agreements with Amazon (up to 5 GW), Google/Broadcom (5 GW of TPU capacity), and SpaceX (Colossus GPU access). Strategic infrastructure partners Micron, Samsung, and SK hynix join the round alongside a broad syndicate of institutional investors. Funding is earmarked for safety and interpretability research, compute scaling, and product expansion including Claude Code and Cowork.
Anthropic publishes foundational 'Core Views on AI Safety' position paper
Anthropic released a detailed position paper outlining their core views on AI safety, arguing that transformative AI could arrive within a decade driven by predictable scaling laws, and that no one currently knows how to train powerful AI systems to robustly behave well. The document explains Anthropic's founding rationale and research strategy, highlighting four priority areas: scaling supervision, mechanistic interpretability, process-oriented learning, and understanding AI generalization. Originally published March 2023, this represents Anthropic's canonical public statement of their safety philosophy and strategic priorities.