A developer-made diagram of Anthropic's Claude agent ecosystem is drawing attention to a stack that now spans frontier models, Claude Code, the Claude Agent SDK, Model Context Protocol connectors, Agent Skills and enterprise workflow surfaces. The timing is notable: Claude Opus 5.5 was released on September 22, 2026, with Anthropic saying it performs at the level of Claude Fable 5.1 on most work while costing 40% less to run than Opus 5.
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