{
  "billing_concept": {
    "id": "bil_prompt_caching_cost_effect",
    "name": "Prompt caching reduces effective cost for repeated context",
    "category": "token_pricing",
    "description": "When a prompt prefix is cached (see subagentcontext.com's prompt-caching concept), reusing that cached prefix across requests is billed more cheaply than reprocessing the same tokens fresh each time.",
    "how_it_works": "This makes prompt caching a direct lever on cost for workflows that repeatedly send the same large system prompt, tool schema, or reference document alongside a smaller varying portion of the request.",
    "source_note": "Cross-references subagentcontext.com's prompt-caching concept page; general mechanism, grounded in the same prompt-caching doc mirrored in this repo (docs/docs/platform.claude.com/docs/en/build-with-claude/prompt-caching.md), no specific discount percentage asserted since not independently re-verified this session.",
    "created_at": "2026-07-02 08:30:36",
    "cite_as": "https://subagentcredits.com/api/billing-concepts/bil_prompt_caching_cost_effect"
  }
}