GitHub is cracking down on heavy Copilot Pro+ users. Starting April 10, 2026, the company is enforcing new usage limits and retiring the Opus 4.6 Fast model, citing strain on shared infrastructure due to 'noisy neighbor' problems from high-concurrency usage patterns. Users hitting limits will either need to wait for a session reset or switch to an alternative model. GitHub recommends Opus 4.6 as a replacement, which runs the same model but without the speed-optimized configuration. The limits come in two flavors. Service reliability limits protect the overall system. Model-specific caps kick in when particular models get hammered. When you hit a model limit, you can switch models or use Auto mode, which distributes load across available options. GitHub's guidance: spread requests out instead of blasting them in concentrated waves. Cursor, the AI-native editor eating into GitHub's mindshare, caps its Pro plan at 500 "fast" requests per month for premium models like Claude 3.5 Sonnet before downgrading users to slower queues. Replit manages load through compute time constraints. Codeium is the outlier, still offering an unrestricted free tier for individuals and gating its paid tier around security features rather than usage throttling. Inference costs are real, and the era of "unlimited" AI coding assistance is ending. GitHub says it's exploring ways to add capacity, but for now, heavy users will feel the squeeze.