OpenAI's 12-hour prompt caching: when the higher write price pays off
OpenAI now offers a 12-hour cache lifetime at 2.5 times the input price. The break-even point, a worked example, and the billing details to check first.
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#Prompt engineering
Writing prompts, instructions and context that get reliable results.
Poisoned rule files can make coding agents import the wrong package
Researchers hid instructions in AGENTS.md-style rule files and got coding agents to swap real dependencies for attacker packages. What it means for teams.
Sonnet 5.5's cache-read price cut: what it does to coding agent bills
Anthropic halved Sonnet 5.5 cache reads on 7 October 2026. A worked example of what that means for an agent turn, and why cache misses now matter more.
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