Anthropic announced two major milestones today, raising $65 billion in Series H funding at a $965 billion post-money valuation and launching Claude Opus 4.8, the latest version of its flagship AI model. Together, the announcements underscore the company’s accelerating enterprise adoption, growing infrastructure footprint, and continued investment in advancing AI capabilities and safety.
The Series H funding round was led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital. The round was also co-led by Capital Group, Coatue, D1 Capital Partners, GIC, ICONIQ, and XN, with participation from a broad group of institutional investors and strategic partners. The financing includes $15 billion of previously committed investments from hyperscalers, including $5 billion from Amazon.
Anthropic said enterprise adoption of Claude continues to expand across industries, with its run-rate revenue surpassing $47 billion earlier this month. The company plans to use the funding to advance safety and interpretability research, expand compute capacity to meet growing demand, and scale products and partnerships supporting customers worldwide.
The company also highlighted strategic infrastructure partnerships with Micron, Samsung, and SK hynix, whose technologies support the global supply of memory, storage, and logic chips. Anthropic said these relationships will help support the growing compute requirements of Claude.
In recent weeks, Anthropic significantly expanded its compute footprint. The company signed agreements with Amazon for up to five gigawatts of new capacity, with Google and Broadcom for five gigawatts of next-generation TPU capacity, and with SpaceX for access to GPU capacity in Colossus 1 and Colossus 2. Anthropic noted that Claude is now the first frontier model available across Amazon Web Services, Google Cloud, and Microsoft Azure, while AWS remains its primary cloud provider and training partner.
Alongside the funding announcement, Anthropic unveiled Claude Opus 4.8, an upgraded version of its flagship model that builds on Opus 4.7 with improvements across coding, reasoning, agentic workflows, and practical knowledge work tasks. The company said Opus 4.8 is available immediately at the same pricing as its predecessor.
Anthropic said early testers found Opus 4.8 to be a more reliable collaborator with stronger judgment during agentic tasks. One of the model’s most notable improvements is increased honesty and transparency around uncertainty. According to Anthropic, evaluations show Opus 4.8 is approximately four times less likely than Opus 4.7 to allow flaws in generated code to pass without acknowledgment.
The company’s Alignment team reported that Opus 4.8 achieved its highest scores yet on measures related to supporting user autonomy and acting in users’ best interests. Anthropic also stated that rates of misaligned behavior, including deception and cooperation with misuse, were substantially lower than Opus 4.7 and comparable to Claude Mythos Preview, its most aligned model to date.
The Opus 4.8 release also introduces several new capabilities. Claude Code now includes a research preview feature called Dynamic Workflows, enabling the model to plan and execute large-scale projects using hundreds of parallel subagents within a single session. Anthropic said this capability allows Claude to perform codebase-wide migrations involving hundreds of thousands of lines of code while validating outputs against existing test suites.
The company also launched effort controls in claude.ai and Cowork, allowing users to adjust how much computational effort Claude applies to a task. Higher effort settings provide deeper reasoning and stronger results, while lower effort settings prioritize speed and reduced usage of rate limits. The Messages API has also been updated to allow developers to modify system instructions during tasks without interrupting prompt caching or workflow execution.
Anthropic said Opus 4.8 defaults to a high-effort setting designed to balance performance and user experience. Additional “extra” and “max” effort modes are available for more demanding workflows, with rate limits increased to support the higher token usage associated with these settings.
Looking ahead, Anthropic said it is developing models that can deliver Opus-level capabilities at lower cost while also advancing a new class of models with even greater intelligence. Through Project Glasswing, select organizations are already testing Claude Mythos Preview for cybersecurity applications. Anthropic expects to bring Mythos-class models to a broader customer base once additional cyber safety safeguards are completed.
Claude Opus 4.8 is available globally through Claude and the Claude API. Pricing remains unchanged from Opus 4.7 at $5 per million input tokens and $25 per million output tokens for standard usage, with fast mode available at $10 per million input tokens and $50 per million output tokens.
KEY QUOTES:
“Claude is increasingly indispensable to our growing global community of customers, and we work tirelessly to make tools like Claude Code and Cowork more helpful, more powerful, and more adaptable to their needs. This funding will help us serve the historic demand we are experiencing, stay at the research frontier, and bring Claude to more of the places where work happens.”
Krishna Rao, Chief Financial Officer, Anthropic
“Claude’s latest advancements have driven large-scale adoption among the world’s most demanding organizations. This momentum positions Anthropic to lead the next phase of AI innovation and capture the enormous opportunity ahead.”
Brad Gerstner, Founder And CEO, Altimeter Capital
“Dragoneer has long partnered with companies building the technology that will shape our future. Anthropic is helping pull forward this future, as intelligence becomes an increasingly critical ingredient to the way businesses operate and how their products show up in the world. The technological progress we are seeing right now is breathtaking. And we believe that we are still in the earliest days of both the development and commercialization of this technology.”
Marc Stad, Managing Partner, Dragoneer
“Anthropic has built an organization in which the world’s best researchers and engineers operate with unmatched clarity of purpose, because they believe this is the most important work they will ever do. Rarely has a company’s culture, mission, and commercial momentum reinforced each other so completely. We are honored to deepen our partnership.”
Neil Mehta, Founder And Managing Partner, Greenoaks
“Startups and Global 5000 companies alike are deploying Claude to handle complex workflows, and in doing so, Claude is learning how businesses actually operate: the context, the processes, the judgment. Anthropic is building the bridge between where enterprise AI stands today and where it’s headed.”
Alfred Lin, Partner, Sequoia Capital
