Unreleased Anthropic Mythos 2 and Mythos 3 and OpenAI Astra
Release coverage from NextBigFuture.com: "Unreleased Anthropic Mythos 2 and Mythos 3 and OpenAI Astra." See the original report for full details via the source link below.
Canonical saga
The Mythos timeline
Every verified milestone in Anthropic’s Mythos-class story, newest first — from the Glasswing preview to the launch of Fable 5 and Mythos 5 and the export-control suspension that followed. Curated anchors are augmented automatically as new reporting lands. Definitions → mythoslm.ai.
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Anthropic Launches Claude Security With Mythos 5 For Vulnerability Scanning
Release coverage from Dataconomy: "Anthropic Launches Claude Security With Mythos 5 For Vulnerability Scanning." See the original report for full details via the source link below.
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Anthropic Just Released The AI They Said Was Too Dangerous | Claude Fable 5 & Mythos Explained Santiago Espinal (EZGK8eAXa4)
Release coverage from Mshale: "Anthropic Just Released The AI They Said Was Too Dangerous | Claude Fable 5 & Mythos Explained Santiago Espinal (EZGK8eAXa4)." See the original report for full details via the source link below.
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Fable 5.1 Targets a Tentative Late August 2026 Launch
Release coverage from Geeky Gadgets: "Fable 5.1 Targets a Tentative Late August 2026 Launch." See the original report for full details via the source link below.
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Anthropic runs unreleased Model 2 stronger than Claude Mythos 5
Release coverage from 디지털투데이: "Anthropic runs unreleased Model 2 stronger than Claude Mythos 5." See the original report for full details via the source link below.
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China's Z.ai launches model it says rivals Anthropic's Mythos
Release coverage from asia.nikkei.com: "China's Z.ai launches model it says rivals Anthropic's Mythos." See the original report for full details via the source link below.
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Status page logs the suspension as an active incident
The Anthropic status board records an active incident — "We’ve suspended access to Claude Mythos 5 and Claude Fable 5" — affecting claude.ai, the Claude API, and Claude Code, and links to the access statement.
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US export-control directive suspends Fable 5 and Mythos 5
Anthropic issues a statement on a US government export-control directive suspending all access to Fable 5 and Mythos 5. The company says it intends to restore Fable 5 to subscription plans when capacity and clearance allow.
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Claude Fable 5 and Claude Mythos 5 launch
Anthropic releases Fable 5 and Mythos 5 — the same underlying model, differentiated by safeguards. Fable 5 ships with safety classifiers that reroute flagged requests to Claude Opus 4.8; Mythos 5 lifts those classifiers under Glasswing-only access.
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Fable 5 reaches general availability and free intro window opens
Fable 5 becomes available on the Claude API, the Claude Platform on AWS, Amazon Bedrock, Google Cloud, and Microsoft Foundry, with 1M-token context and up to 128k output. It is free for Pro, Max, Team, and Enterprise plans through June 22, with usage-based pricing after June 23.
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Claude Mythos Preview ships via Project Glasswing
The first Mythos-class model — a tier above Opus — reaches roughly 50 selected organizations in cyberdefense and critical infrastructure, including the US government, under the limited-access Project Glasswing program.