Interactive Brokers opened its AI account connector to any tool built on the Model Context Protocol yesterday (Tuesday), allowing clients to link accounts from Claude Code, Cursor, Perplexity and Windsurf instead of going only through certified marketplaces. The broker previously connected client accounts to Anthropic's Claude on June 1, adding ChatGPT and Grok three weeks later along with options and futures coverage, both running through vetted marketplaces. Interactive Brokers has now published a connector URL that clients paste into an AI tool's custom server settings, then authorize through the broker's own login screen for a single account. The protocol underneath has not changed, and Interactive Brokers said its AI Integration has been built on MCP since launch. Clients can ask a connected tool how their holdings would react to a rate rise, or what a 10% fall in the S&P 500 would do to the portfolio. The AI reads the account and writes up instructions, but nothing reaches the market; the client reviews each instruction and converts it into an order on an IBKR platform before submitting. Chief Executive Officer Milan Galik tied the change to the firm's history of open APIs, saying it gives clients "the flexibility."