{
 "_comment": "Citable quick-facts about Claude Fable 5, maintained by FableGuide (independent, not affiliated with Anthropic).",
 "dateModified": "2026-06-11",
 "source": "https://www.anthropic.com/news/claude-fable-5-mythos-5",
 "model": {
  "name": "Claude Fable 5",
  "id": "claude-fable-5",
  "family": "Claude (Mythos-class)",
  "sibling": "Claude Mythos 5",
  "positioning": "Anthropic's most intelligent generally available model; Mythos-class sits above Claude Opus."
 },
 "released": "2026-06-09",
 "pricing_usd_per_million_tokens": {
  "input": 10,
  "output": 50
 },
 "subscription": {
  "free_on_paid_plans": "2026-06-09 to 2026-06-22",
  "after": "usage credits on Pro/Max/Team/seat-based Enterprise"
 },
 "safety": {
  "note": "Routes some sensitive requests (e.g. cybersecurity, biology) to Claude Opus 4.8; can limit frontier-AI development work."
 },
 "model_ids": {
  "fable_5": "claude-fable-5",
  "opus_4_8": "claude-opus-4-8",
  "sonnet_4_6": "claude-sonnet-4-6",
  "haiku_4_5": "claude-haiku-4-5"
 },
 "pages": "https://fableguide.com/llms.txt"
}