{"i":19,"slug":"prompt-cache-across-sessions","chart":{"id":"cache-sessions-codex-turn1-cached","title":"GPT-6.1 Sol (medium) · Codex CLI: cached input tokens on turn 1, by setup and session","subtitle":"Turn-1 input was about 16,042 tokens in every call","kind":"grouped-bar","unit":"tokens","xLabel":"Setup","yLabel":"Cached input tokens","series":{"$k":["name","points"],"$r":[["Session 1 (first in its setup)",[{"label":"A: new folder each time","value":4864,"n":1},{"label":"B: fixed folder","value":0,"n":1}]],["Session 2",[{"label":"A: new folder each time","value":8960,"n":1},{"label":"B: fixed folder","value":8960,"n":1}]],["Session 3",[{"label":"A: new folder each time","value":0,"n":1},{"label":"B: fixed folder","value":0,"n":1}]]]},"note":"Cached input as the Codex app-server reports it (input includes the cached tokens; it reports no cache writes). Codex sends a large system prompt of its own, so a cached count of about 9,000 can come from that prefix alone. Each bar is one call. Not comparable with the Claude Code bars: different prefix, different cache.","sourceIds":["agent-cache-sessions"]}}