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The Batch API's default prompt cache expires in 5 minutes while the batch itself runs for up to an hour, so the two cost levers quietly cancel each other out. Six documented constraints, and the single assumption underneath all of them. Field log, September 2026.
Claude Code auto compact fires on a per-model token boundary, not a percentage. What it costs is set by prompt cache warmth rather than context size, and a path-scoped rule does not come back afterwards until Claude reads a matching file again.
Claude Code's /fast is not a speed dial, it is a mode. The first toggle in a conversation reprices your whole context, the toggle moves your model one way and does not move it back, and asking for fast is not the same as getting it.
