AI API Pricing Comparison 2026: The Real Cost of GPT-4.1, Claude Sonnet 4.6, and Gemini 2.5

AI API Pricing Comparison 2026: The Real Cost of GPT-4.1, Claude Sonnet 4.6, and Gemini 2.5 A data-driven breakdown of what you actually pay for AI API calls across OpenAI, Anthropic, Google, OpenRouter, and LemonData, including the hidden costs nobody talks about. Why This Comparison Exists AI API pricing looks simple on the surface: input tokens cost X, output tokens cost Y. But once you factor in prompt caching, minimum deposits, payment friction, and currency conversion losses, the real cost can vary significantly depending on where you buy your tokens. Here's a side-by-side look at five platforms across the most popular models as of early 2026. All prices are in USD per 1 million tokens unless otherwise noted. Platforms compared: OpenAI (direct): api.openai.com Anthropic (direct): api.anthropic.com Google (direct): Vertex AI / AI Studio OpenRouter: openrouter.ai LemonData: api.lemondata.cc Token Pricing: The Core Numbers OpenAI Models Model Metric OpenAI Direct OpenRouter LemonDat