Twenty months after the initial announcement, Model Context Protocol went from curiosity to de-facto standard among agent clients and servers. What is available, which servers are worth it, which problems remain open, and how it compares to earlier protocol maps.
Claude Haiku 4.5, released by Anthropic on October 15, 2025, performs close to Sonnet 4 on structured tasks for roughly a third of the price. It carries a 200K-token context window and tool use on par with Sonnet 4.5. Pairing it as a filter ahead of Sonnet cuts total cost several times over.
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