A roundup of key updates in Claude 4.5 (Haiku) and 4.6 (Sonnet, Opus) — Plan Mode, Hooks System, MCP Servers, Subagents, Agent SDK, and a practical guide to choosing the right model for each task type.
AI does not need retraining to become more capable. By extracting workflows, commands, rules and guardrails from open-source code, we can build a reusable skill ecosystem for AI agents.