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.
You can't be comparing OpenAI API with Anthropic subscription. The comparison here is OpenAI Codex subscription with Anthropic subscription. And when you do that, it turns out that the Codex limits are a lot higher for the same price. So then if Anthropic is selling at a large loss, OpenAI is selling at an even much bigger one.