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Compatibility dates

Every deployed Version declares standard compatibility_date. It must fall inside the range advertised by GET /client/v4/open-compute/capabilities; the current example uses 2026-09-08.

Terminal window
curl -H "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  "$CLOUDFLARE_API_BASE_URL/open-compute/capabilities"

Read compatibility_date.minimum and compatibility_date.maximum. The date selects workerd’s observable behavior as documented by Cloudflare compatibility dates.

Topic Cloudflare open-compute
Date selects workerd observable behavior Yes Yes
Per-project compatibility_date Yes Required and persisted per immutable Version
Supported range Cloudflare runtime Extension capabilities plus the formal runtime pin