---
type: warning
name: anthropics-built-in-prompt-caching-supersedes-custom-caching
confidence: Verified
source: .claude/CLAUDE.md
---

# Warning: Anthropic's built-in prompt caching supersedes custom
  caching

## Condition

Since Dec 2024, the Anthropic API provides 90% input token discounts via server-side prompt caching

## Risk

Ignoring this guidance may cause: Anthropic's built-in prompt caching supersedes custom
  caching

## Mitigation

1. Removed in favor of the native solution

## Confidence

**Verified** — Confirmed by prior incident (Lessons Learned)

## Related Topics
- Error: Diagnostic help: Anthropic's built-in prompt caching supersedes custom
  caching
