Anthropic shipped two new frontier models this week and left the headline price exactly where it was: $10 per million input tokens, $50 output, unchanged. The number that moved is one almost nobody looks at. Cached input reads fell 75%, from $1.00 per million tokens to $0.25.

The price you get quoted is the price of answering once. Your bill is set by re-reading.

In this episode, Stephen Forte covers:

• What a cached read actually is, and why it decides agent economics: an agent is not answering one question. Every step, it is handed the whole situation again — your instructions, every tool definition, the document or codebase, and a conversation that keeps getting longer. On the new models a cache hit costs 2.5% of the standard input rate, against 10% on Anthropic's other models.
• Anthropic's own estimate that th ...