{"data":{"slug":"claude-fable-5","etype":"model","name":"Claude 5 (Fable 5 / Opus 5 / Sonnet 5)","cat":"Coding","subtitle":"Anthropic's 2026 generation — four releases in under two months.","summary":"Anthropic opened its Claude 5 generation with Fable 5 (announced June 9, 2026): a new frontier tier above Opus with always-on adaptive thinking, a 1-million-token context window and 128K output tokens. Sonnet 5 followed on June 30 for agentic coding and knowledge work, and Opus 5 on July 24 — positioned as approaching Fable 5's intelligence at half the price, and the new default on the Max plan — Anthropic's fourth Claude 5 release in under two months. A restricted Mythos-class variant (Claude Mythos 5) shares Fable's underlying model and is available only to approved organizations. Parameters undisclosed.","attrs":[{"b":"Official","g":"Overview","l":"2026 cadence","v":"Fable 5 (Jun 9) → Sonnet 5 (Jun 30) → Opus 5 (Jul 24); 1M context / 128K output across the line"},{"g":"Overview","l":"Parameters","v":"Not publicly disclosed"}],"kf":{"params":"Not publicly disclosed","context":"1M","weights":"Closed","modality":"Text + vision","rel_date":"2026-07","developer":"Anthropic"},"aliases":["Fable 5","Claude Fable 5","Opus 5","Sonnet 5","Claude 5","Mythos 5"],"ticker":null,"exchange":null,"hq":null,"founded":null,"website":null,"status":"Current","region":null,"asof":"2026-08-31","sources":[{"url":"https://www.anthropic.com/news/claude-opus-5","label":"Anthropic — Introducing Claude Opus 5"},{"url":"https://www.axios.com/2026/07/24/anthropic-releases-new-model-opus-5","label":"Axios on Opus 5 (Jul 2026)"}]},"meta":{"found":true,"count":1,"served_from":"site cache (no live upstream calls)","as_of":"2026-10-14T10:42:09+00:00","disclaimer":"Research and information only — not investment advice. Structured records carry basis labels (vendor spec / reported / estimate); market quotes are delayed/indicative.","attribution":"Records compiled from vendor documentation, official filings and reputable public reporting; market quotes via financial data providers. See /data-sources."}}