March 6 Cache TTL Regression
- Entity ID:
ent-20260419-d189db2fa206 - Type:
issue - Scope:
shared - Status:
active - Aliases: first-silent-regression, mar-6-regression
Description
First silent server-side TTL regression on 2026-03-06 flipping both main and sub agents from a stable '100% 1h golden era' (Feb 7 – Mar 5) into a mixed 1h/5m regime (6-97% 1h variance). Confirmed by The Register; Anthropic (Sumner/Cherny) framed it as a per-call-type optimization, community billing data showed 5.1x more cache busts and +$277.80/month for one measured workflow.
Key claims
- Anthropic's systemic-cost claim contradicted by billing data
- March 6 regression produced 5.1x cache busts and +$277.80/mo for one developer
Relations
- FORCE_PROMPT_CACHING_5M --[related_to]--> March 6 Cache TTL Regression
- ENABLE_PROMPT_CACHING_1H --[fixed]--> March 6 Cache TTL Regression
- Cache TTL Scandal (95-Day JSONL Analysis) --[supports]--> March 6 Cache TTL Regression