New and updated reference pages on Anthropic’s Mythos-class models (Mythos Preview, Fable 5, Mythos 5) and Project Glasswing.https://mythoslm.ai/enhttps://mythoslm.ai/how-to-access-claude-mythos/https://mythoslm.ai/how-to-access-claude-mythos/The realistic ways to reach Mythos-class models: Project Glasswing for Mythos editions, Fable 5 via API and cloud — and why access is currently suspended.Tue, 30 Jun 2026 00:00:00 GMTaccesshttps://mythoslm.ai/claude-mythos-preview/https://mythoslm.ai/claude-mythos-preview/Inside the April 2026 Mythos Preview: who received it, the ~50 selected organizations, its delivery through Project Glasswing, and the ~$25/$125 pricing.Tue, 30 Jun 2026 00:00:00 GMTaccesshttps://mythoslm.ai/project-glasswing-access/https://mythoslm.ai/project-glasswing-access/Project Glasswing is selection-based, not open sign-up. Here's what's publicly known about who it targets, how participation is arranged, and what it grants.Tue, 30 Jun 2026 00:00:00 GMTaccesshttps://mythoslm.ai/fable-5-free/https://mythoslm.ai/fable-5-free/Fable 5 was free for Pro, Max, Team, and Enterprise from June 9–22, 2026, then usage-based after June 23. A later export-control suspension paused access.Tue, 30 Jun 2026 00:00:00 GMTaccesshttps://mythoslm.ai/fable-5-on-bedrock/https://mythoslm.ai/fable-5-on-bedrock/Where Fable 5 ships: Amazon Bedrock, the Claude Platform on AWS, Google Cloud, and Microsoft Foundry — plus the Claude API, and why access is currently suspended.Tue, 30 Jun 2026 00:00:00 GMTaccesshttps://mythoslm.ai/is-claude-fable-5-available/https://mythoslm.ai/is-claude-fable-5-available/Whether Claude Fable 5 is available right now depends on live data — Anthropic's status page drives the verdict. Here's the context and where to check.Tue, 30 Jun 2026 00:00:00 GMTavailabilityhttps://mythoslm.ai/is-claude-mythos-available/https://mythoslm.ai/is-claude-mythos-available/Claude Mythos availability is governed by live status data, not a fixed answer. Here's the access history and the canonical place to check right now.Tue, 30 Jun 2026 00:00:00 GMTavailabilityhttps://mythoslm.ai/is-claude-mythos-5-available/https://mythoslm.ai/is-claude-mythos-5-available/Claude Mythos 5 is the Glasswing-only edition of the June 2026 release. Its live availability is shown above; here's the access context behind it.Tue, 30 Jun 2026 00:00:00 GMTavailabilityhttps://mythoslm.ai/is-fable-5-suspended/https://mythoslm.ai/is-fable-5-suspended/Fable 5 was suspended by a US export-control directive on June 12, 2026. Whether that's still in force is shown in the live status above — here's the context.Tue, 30 Jun 2026 00:00:00 GMTavailabilityhttps://mythoslm.ai/when-will-mythos-be-unsuspended/https://mythoslm.ai/when-will-mythos-be-unsuspended/There's no confirmed restoration date for Fable 5 or Mythos 5. Anthropic intends to restore access when capacity and clearance allow — track it via live status.Tue, 30 Jun 2026 00:00:00 GMTavailabilityhttps://mythoslm.ai/claude-mythos-release-date/https://mythoslm.ai/claude-mythos-release-date/A dated timeline of Claude Mythos — from the April 2026 Preview to the June 9, 2026 launch of Mythos 5 and Fable 5, plus the suspension that followed.Tue, 30 Jun 2026 00:00:00 GMTavailabilityhttps://mythoslm.ai/claude-fable-5-release-date/https://mythoslm.ai/claude-fable-5-release-date/Claude Fable 5 released June 9, 2026, with a free window through June 22 and usage-based pricing from June 23 — then a June 12 export-control suspension intervened.Tue, 30 Jun 2026 00:00:00 GMTavailabilityhttps://mythoslm.ai/anthropic-mythos-2026/https://mythoslm.ai/anthropic-mythos-2026/A 2026 year-in-review of Anthropic's Mythos-class models — the April Preview, the June 9 launch of Mythos 5 and Fable 5, and the June 12 export-control suspension.Tue, 30 Jun 2026 00:00:00 GMTavailabilityhttps://mythoslm.ai/compare/fable-5-vs-mythos-5/https://mythoslm.ai/compare/fable-5-vs-mythos-5/Fable 5 and Mythos 5 share one underlying model — the only real difference is safeguards. Here's what changes and which edition you'd actually use.Tue, 30 Jun 2026 00:00:00 GMTcomparisonshttps://mythoslm.ai/compare/fable-5-vs-opus-4-8/https://mythoslm.ai/compare/fable-5-vs-opus-4-8/Fable 5 sits a tier above Opus 4.8 but costs more and is currently suspended. Opus 4.8 is generally available. Here's how to choose between them.Tue, 30 Jun 2026 00:00:00 GMTcomparisonshttps://mythoslm.ai/compare/mythos-vs-opus/https://mythoslm.ai/compare/mythos-vs-opus/Mythos 5 is a tier above Opus 4.8, but it's Glasswing-only and currently suspended. Opus 4.8 is the open flagship. Here's the honest comparison.Tue, 30 Jun 2026 00:00:00 GMTcomparisonshttps://mythoslm.ai/compare/fable-5-vs-gpt-5-5/https://mythoslm.ai/compare/fable-5-vs-gpt-5-5/Comparing Anthropic's Fable 5 with OpenAI's GPT-5.5. We document Fable 5 specs precisely and point you to OpenAI for authoritative GPT-5.5 numbers.Tue, 30 Jun 2026 00:00:00 GMTcomparisonshttps://mythoslm.ai/compare/fable-5-vs-gemini-3-5/https://mythoslm.ai/compare/fable-5-vs-gemini-3-5/How Anthropic's Fable 5 stacks up against Google's Gemini 3.5. We give Fable 5 specs precisely and defer to Google for authoritative Gemini numbers.Tue, 30 Jun 2026 00:00:00 GMTcomparisonshttps://mythoslm.ai/compare/fable-5-vs-sonnet-4-6/https://mythoslm.ai/compare/fable-5-vs-sonnet-4-6/Fable 5 is Mythos-class and premium-priced; Sonnet 4.6 is the balanced, cheap workhorse. Here's when each one is the right tool for the job.Tue, 30 Jun 2026 00:00:00 GMTcomparisonshttps://mythoslm.ai/compare/opus-4-8-vs-sonnet-4-6/https://mythoslm.ai/compare/opus-4-8-vs-sonnet-4-6/For most users the real decision is Opus 4.8 vs Sonnet 4.6. Both are generally available — here's how to pick on capability, cost, and workload.Tue, 30 Jun 2026 00:00:00 GMTcomparisonshttps://mythoslm.ai/faq/https://mythoslm.ai/faq/Straight answers to the most common questions about Claude Mythos, Fable 5, Mythos 5 and Project Glasswing — availability, pricing, safeguards and access.Tue, 30 Jun 2026 00:00:00 GMTfaqhttps://mythoslm.ai/project-glasswing-explained/https://mythoslm.ai/project-glasswing-explained/A plain-language overview of Project Glasswing: Anthropic's restricted program for Mythos-class access, who it serves, how it's priced, and its current status.Tue, 30 Jun 2026 00:00:00 GMTglasswinghttps://mythoslm.ai/glasswing-organizations/https://mythoslm.ai/glasswing-organizations/What's publicly known about Project Glasswing participants: roughly 50 organizations in cyberdefense and critical infrastructure. No named companies are confirmed.Tue, 30 Jun 2026 00:00:00 GMTglasswinghttps://mythoslm.ai/glasswing-countries/https://mythoslm.ai/glasswing-countries/On Project Glasswing geography: US-government involvement is publicly indicated, but a precise country list is not confirmed. Here's how to separate fact from rumor.Tue, 30 Jun 2026 00:00:00 GMTglasswinghttps://mythoslm.ai/glasswing-pricing/https://mythoslm.ai/glasswing-pricing/Project Glasswing Preview pricing was about $25 input / $125 output per million tokens — several times the public Fable 5 rate of $10/$50. Here's the comparison.Tue, 30 Jun 2026 00:00:00 GMTglasswinghttps://mythoslm.ai/glossary/mythos-class/https://mythoslm.ai/glossary/mythos-class/Mythos-class is Anthropic's official tier name for its most capable models, positioned above Opus and covering the Mythos Preview and Mythos 5.Tue, 30 Jun 2026 00:00:00 GMTglossaryhttps://mythoslm.ai/glossary/project-glasswing/https://mythoslm.ai/glossary/project-glasswing/Project Glasswing is Anthropic's invitation-only program through which the unrestricted Mythos editions are made available to selected organizations.Tue, 30 Jun 2026 00:00:00 GMTglossaryhttps://mythoslm.ai/glossary/covered-model/https://mythoslm.ai/glossary/covered-model/A Covered Model is a policy designation marking a model that triggers heightened safeguards and obligations because of its risk profile and capabilities.Tue, 30 Jun 2026 00:00:00 GMTglossaryhttps://mythoslm.ai/glossary/classifier-fallback/https://mythoslm.ai/glossary/classifier-fallback/Classifier fallback is Fable 5's behavior of rerouting requests flagged by its safety classifiers to Claude Opus 4.8, with the user informed.Tue, 30 Jun 2026 00:00:00 GMTglossaryhttps://mythoslm.ai/glossary/distillation/https://mythoslm.ai/glossary/distillation/Distillation is training or extracting a weaker model using a stronger model's outputs — a risk domain Fable 5's safety classifiers are designed to cover.Tue, 30 Jun 2026 00:00:00 GMTglossaryhttps://mythoslm.ai/glossary/safeguard/https://mythoslm.ai/glossary/safeguard/A safeguard is a safety classifier in Fable 5 that screens requests in sensitive domains and can reroute flagged ones to a more conservative model.Tue, 30 Jun 2026 00:00:00 GMTglossaryhttps://mythoslm.ai/glossary/zero-data-retention/https://mythoslm.ai/glossary/zero-data-retention/Zero-data-retention (ZDR) is an option where prompts and outputs are not stored; Fable 5 and Mythos 5 do not offer it, using 30-day retention instead.Tue, 30 Jun 2026 00:00:00 GMTglossaryhttps://mythoslm.ai/glossary/context-window/https://mythoslm.ai/glossary/context-window/A context window is the amount of text a model can consider at once; Mythos-class models offer a 1M-token context with up to 128k tokens of output.Tue, 30 Jun 2026 00:00:00 GMTglossaryhttps://mythoslm.ai/glossary/export-control-directive/https://mythoslm.ai/glossary/export-control-directive/The export-control directive is the June 12, 2026 US order that suspended access to both Fable 5 and Mythos 5; the suspension is currently active.Tue, 30 Jun 2026 00:00:00 GMTglossaryhttps://mythoslm.ai/glossary/mythos-preview/https://mythoslm.ai/glossary/mythos-preview/The Claude Mythos Preview was an April 2026 limited release via Project Glasswing to roughly 50 cyberdefense and critical-infrastructure organizations.Tue, 30 Jun 2026 00:00:00 GMTglossaryhttps://mythoslm.ai/glossary/fable/https://mythoslm.ai/glossary/fable/Fable, from Latin fabula meaning 'that which is told' and akin to Greek mythos, names Anthropic's safeguarded public edition of the Mythos-class model.Tue, 30 Jun 2026 00:00:00 GMTglossaryhttps://mythoslm.ai/glossary/glasswing-program/https://mythoslm.ai/glossary/glasswing-program/The Glasswing program is Anthropic's selective access initiative governing distribution of the unrestricted Mythos editions to vetted organizations.Tue, 30 Jun 2026 00:00:00 GMTglossaryhttps://mythoslm.ai/claude-mythos-leak/https://mythoslm.ai/claude-mythos-leak/A factual look at the pre-release Claude Mythos leaks and rumors — what circulated, what turned out true, and the Capybara-tier mislabel that confused everyone.Tue, 30 Jun 2026 00:00:00 GMTrumorshttps://mythoslm.ai/capybara-tier-rumor/https://mythoslm.ai/capybara-tier-rumor/The "Capybara tier" was an internal-rumor mislabel that spread before launch. Anthropic's official designation for the tier above Opus is Mythos-class.Tue, 30 Jun 2026 00:00:00 GMTrumorshttps://mythoslm.ai/claude-mythos-escape/https://mythoslm.ai/claude-mythos-escape/An honest explainer of the "claude mythos escape" search — what users are usually after, why Fable 5 reroutes flagged requests, and why no bypass is provided.Tue, 30 Jun 2026 00:00:00 GMTrumorshttps://mythoslm.ai/claude-mythos-cybersecurity/https://mythoslm.ai/claude-mythos-cybersecurity/Why cybersecurity is one of Fable 5's classifier-covered domains, how Project Glasswing applies Mythos-class capability to cyberdefense, and the dual-use framing.Tue, 30 Jun 2026 00:00:00 GMTsafetyhttps://mythoslm.ai/fable-5-safeguards/https://mythoslm.ai/fable-5-safeguards/How Fable 5's safeguards work: domain classifiers that reroute flagged requests to Opus 4.8, Covered Model status, 30-day retention, and no zero-data-retention.Tue, 30 Jun 2026 00:00:00 GMTsafetyhttps://mythoslm.ai/fable-5-classifiers/https://mythoslm.ai/fable-5-classifiers/Fable 5's three safety classifiers cover cybersecurity, biology/chemistry, and distillation. How flagging works, why under 5% of sessions reroute, and user transparency.Tue, 30 Jun 2026 00:00:00 GMTsafetyhttps://mythoslm.ai/why-is-mythos-restricted/https://mythoslm.ai/why-is-mythos-restricted/Mythos is restricted for two reasons: Mythos 5 is Glasswing-only by safety design, and a June 12, 2026 US export-control directive suspended Fable 5 and Mythos 5.Tue, 30 Jun 2026 00:00:00 GMTsafetyhttps://mythoslm.ai/mythos-export-control/https://mythoslm.ai/mythos-export-control/What the US export-control directive of June 12, 2026 did to Fable 5 and Mythos 5, why it applies to Covered Models, its current status, and the intended restoration.Tue, 30 Jun 2026 00:00:00 GMTsafetyhttps://mythoslm.ai/fable-5-distillation/https://mythoslm.ai/fable-5-distillation/What model distillation is, why extracting a smaller model from Mythos-class outputs is a gated risk, and how Fable 5's distillation classifier addresses it.Tue, 30 Jun 2026 00:00:00 GMTsafetyhttps://mythoslm.ai/claude-mythos-benchmarks/https://mythoslm.ai/claude-mythos-benchmarks/What Claude Mythos benchmarks really show in 2026 — why most circulating Mythos-class scores are unofficial, and where Anthropic's official numbers will land.Tue, 30 Jun 2026 00:00:00 GMTspecshttps://mythoslm.ai/claude-mythos-reddit/https://mythoslm.ai/claude-mythos-reddit/A neutral roundup of what people discuss about Claude Mythos on Reddit and forums — availability, the Capybara mislabel, the reroute, and what's verified.Tue, 30 Jun 2026 00:00:00 GMTrumorshttps://mythoslm.ai/claude-mythos-specs/https://mythoslm.ai/claude-mythos-specs/The canonical Mythos-class spec sheet: 1M token context, up to 128k output, $10/$50 pricing, Covered Model status, and 30-day retention.Tue, 30 Jun 2026 00:00:00 GMTspecshttps://mythoslm.ai/fable-5-benchmarks/https://mythoslm.ai/fable-5-benchmarks/Why there are no official Fable 5 benchmark scores yet, how to read the unofficial numbers circulating, and where verified results will appear.Tue, 30 Jun 2026 00:00:00 GMTspecshttps://mythoslm.ai/mythos-5-context-window/https://mythoslm.ai/mythos-5-context-window/Mythos 5 offers a 1M token context window and up to 128k tokens of output. Here's what that enables, and why Fable 5 matches it exactly.Tue, 30 Jun 2026 00:00:00 GMTspecshttps://mythoslm.ai/fable-5-pricing/https://mythoslm.ai/fable-5-pricing/Fable 5 pricing breakdown: $10 input / $50 output per million tokens after the intro window, free for Pro/Max/Team/Enterprise Jun 9-22, then usage-based.Tue, 30 Jun 2026 00:00:00 GMTspecshttps://mythoslm.ai/mythos-5-pricing/https://mythoslm.ai/mythos-5-pricing/Mythos 5 reference pricing is $10 input / $50 output per million tokens, but Mythos 5 is Glasswing-only and the Preview used roughly $25/$125.Tue, 30 Jun 2026 00:00:00 GMTspecshttps://mythoslm.ai/claude-mythos-system-card/https://mythoslm.ai/claude-mythos-system-card/What a system card is, what one would document for a Covered Model like Mythos, and why the official Mythos/Fable card is not yet fully published.Tue, 30 Jun 2026 00:00:00 GMTspecshttps://mythoslm.ai/what-is-claude-mythos/https://mythoslm.ai/what-is-claude-mythos/Claude Mythos is Anthropic's Mythos-class AI model tier — the level above Opus. What the large language model covers, who can use it, and its status.Tue, 30 Jun 2026 00:00:00 GMTwhat-ishttps://mythoslm.ai/what-is-anthropic-mythos/https://mythoslm.ai/what-is-anthropic-mythos/“Anthropic Mythos” and “Claude Mythos” are the same thing: Anthropic's Mythos-class model tier above Opus. The plain-English version, with sources.Tue, 30 Jun 2026 00:00:00 GMTwhat-ishttps://mythoslm.ai/what-is-mythos-class/https://mythoslm.ai/what-is-mythos-class/Mythos-class is Anthropic's official designation for its model tier above Opus. What the term means, what it includes, and why it matters.Tue, 30 Jun 2026 00:00:00 GMTwhat-ishttps://mythoslm.ai/what-is-claude-fable-5/https://mythoslm.ai/what-is-claude-fable-5/Claude Fable 5 is the public, safeguarded edition of Anthropic's June 2026 Mythos-class model. Same model as Mythos 5, with safety classifiers.Tue, 30 Jun 2026 00:00:00 GMTwhat-ishttps://mythoslm.ai/what-is-claude-mythos-5/https://mythoslm.ai/what-is-claude-mythos-5/Claude Mythos 5 is the unrestricted, Glasswing-only edition of Anthropic's June 2026 Mythos-class model — the same model as Fable 5 with classifiers lifted.Tue, 30 Jun 2026 00:00:00 GMTwhat-ishttps://mythoslm.ai/what-is-project-glasswing/https://mythoslm.ai/what-is-project-glasswing/Project Glasswing is Anthropic's restricted-access program for Mythos-class models — vetted organisations in cyberdefense and critical infrastructure.Tue, 30 Jun 2026 00:00:00 GMTwhat-is