The Platform Cost Reality   AI agent implementations depend on third-party platforms for AI, voice, and workflow capabilities. Understanding complete platform costs prevents budget surprises.  These are ongoing subscription costs separate from implementation fees.      Platform Categories   AI Foundation Platforms   Purpose: Provide AI conversation capability  Leading platforms:   OpenAI (GPT-4, GPT-4 Turbo)  Anthropic (Claude)  Google (Gemini)  Pricing models:   Token-based