Anthropic raises $65B in Series H at $965B post-money valuation and launches Claude Opus 4.8 with Dynamic Workflows

Anthropic raised $65B in Series H at a $965B post-money valuation, led by Altimeter, Dragoneer, Greenoaks, and Sequoia. The company disclosed run-rate revenue of $47B and said the funding will support research and capacity expansion for Claude demand.

Claude Opus 4.8 is positioned as an update to Opus 4.7 with improved judgment, greater honesty about its own progress, and the ability to work independently for longer—at the same price. The company also launched Dynamic Workflows in Claude Code, a research-preview orchestration system where Claude plans work and spawns hundreds of parallel subagents (autonomous AI workers) to tackle large tasks.

Independent evaluations confirmed 4.8 is a meaningful improvement over 4.7 on long-horizon agentic coding and knowledge work, though community reactions diverged on whether this represents a frontier-resetting leap or catch-up to OpenAI's GPT-5.5-family. Some users noted improvements in the model's willingness to flag flaws in its own code and avoid false claims of task completion.