The cached input price is notable here: previously with GPT-4o it was 1/2 the cost of raw input, now it's 1/4th.

It's still not as notable as Claude's 1/10th the cost of raw input, but it shows OpenAI's making improvements in this area.

Unless that has changed, anthropics (and gemini) caches are opt-in though if I recall, openai automatically chaches for you.