Only if you set `ENABLE_PROMPT_CACHING_1H`, which was mentioned in the release notes for a recent Claude Code release but doesn't seem to be in the official docs.

subusers supposedly get it automatic again after the fix (and now also with `DISABLE_TELEMETRY=1`)

but if you are api user you must set `ENABLE_PROMPT_CACHING_1H` as i understood

and when using your own api (via `ANTHROPIC_BASE_URL`) ensure `CLAUDE_CODE_ATTRIBUTION_HEADER=0` is set as well... https://github.com/anthropics/claude-code/issues/50085

and check out the other neckbreakers ive found pukes lots of malicious compliance by feels... :/

[BUG] new sessions will *never* hit a (full)cache #47098 https://github.com/anthropics/claude-code/issues/47098

[BUG] /clear bleeds into the next session (what also breaks cache) #47756 https://github.com/anthropics/claude-code/issues/47756

[BUG] uncachable system prompt caused by includeGitInstructions / CLAUDE_CODE_DISABLE_GIT_INSTRUCTIONS -> git status https://github.com/anthropics/claude-code/issues/47107

Bruh. It's getting hard to track down all these MAKE_IT_ACTUALLY_WORK settings that default to off for no reason.