Just looking at my own usage at work, we’re spending around $50/day on OpenAI API credits (with Codex). With Claude Code I get higher usage limits for $200/month, or around $8/day. Probably the equivalent from OpenAI is around $100/day of API credits.

Maybe OpenAI has a 12x markup on API credits, or Anthropic is much better at running inference, but my best guess is that Anthropic is selling at a large loss.