tl;dr: Goldman Sachs has restricted Claude Code and GitHub Copilot to its ~12,000 engineers, cutting off traders and bankers who had been using the agents to model positions and track client flows—a reversal from July, when its CIO was publicly touting such "vibe coding." The concerns include unreviewed code running on trading desks, information-barrier violations, and token costs. Notably, Goldman is simultaneously a lead underwriter on Anthropic's upcoming IPO.