--- title: "Claude Fable - Mythos 5.1 — AI hype score and trend · Above the Fog" canonical_url: https://abovethefog.app/topics/claude_fable_mythos as_of: 2026-09-27 updated: 2026-09-28T22:02:40Z --- # Claude Fable - Mythos 5.1 (🧠 Models) [Home](https://abovethefog.app/index.md) › [Topics](https://abovethefog.app/topics.md) › Claude Fable - Mythos 5.1 Claude Fable - Mythos 5.1 is 💤 Quiet on Above the Fog’s AI hype radar: a hype score of 0 out of 100 on Sep 27, 2026, 19 points lower than 7 days before. Its attention is within the normal range across the monitored sources. Its last hype episode in the 30-day window ran from Sep 22 to Sep 22 (peak 30 on Sep 22). Claude Fable 5.1 and Mythos 5.1 (Anthropic, Sep 1, 2026): the same frontier model with different safeguards; Mythos is trusted-access only. First seen on Google Trends (search interest) · Sep 13 — the first monitored source to go above normal for it in the last 14 days. Why this stage: within the normal range across monitored sources. - **Stage:** 💤 Quiet — within the normal range across the monitored sources - **Hype score:** 0 / 100 · −9.6 in 1 day · −18.9 in 7 days - **In hype since:** not in hype now - **Peak, 30 days:** 85.5 on Sep 2, 2026 - **Category:** 🧠 Models - **Made by:** [Anthropic](https://abovethefog.app/topics/anthropic.md) - **Part of:** [Claude](https://abovethefog.app/topics/claude.md) - **Official site:** [claude.ai](https://claude.ai) - **Sources above normal:** 0 of 24 scoring it (0 independent families) - **Stories in 7 days:** 279 - **Share of voice:** 0.6% of the radar’s attention in 7 days ## Where the attention comes from “Normal” is the median of the source’s previous 14 normal days for this topic. A source is above normal when its value is at least 30% over that level and stands out from its usual day-to-day variation (z ≥ 2); the share is the part of the hype score that source explains. “× normal” is left blank when the normal level is 0. | Source | Metric | Latest | Normal | × normal | Above normal | Share of score | |---|---|---:|---:|---:|---|---:| | Bluesky | trending | 0 (Sep 26) | 0 | — | no | 0% | | Cerebral Valley (AI events) | events | 0 (Sep 26) | 0 | — | no | 0% | | Developer forums (Cursor, OpenAI, Hugging Face) | items | 0 | 0 | — | no | 0% | | GitHub Trending | trending | 0 (Sep 26) | 0 | — | no | 0% | | Google Trends (Trending now) | trending | 0 (Sep 26) | 0 | — | no | 0% | | Hugging Face Daily Papers | items | 0 | 0 | — | no | 0% | | HN: front-page time (ClickHouse) | frontpage hours | 0 | 0 | — | no | 0% | | Lobste.rs | items | 0 | 0 | — | no | 0% | ## Stories behind it 1. [claude-fable-5-high enters the text Arena leaderboard at #8](https://arena.ai/leaderboard/text) — LMArena (leaderboard) (anthropic) · Sep 25 · score 36,462 2. [THEY FUCKING COOKED YO! Opus 5.5 is a massive upgrade.](https://www.reddit.com/r/ClaudeCode/comments/1wnt4d3/) — Reddit (r/ClaudeCode) · Sep 23 · score 1,454 · 187 comments 3. [Claude 5.5 Sonnet is live and it’s roughly Opus 5.5 but cheaper www.anthropic.com/claude-sonne...](https://bsky.app/profile/timkellogg.me/post/3mwlwkr2lsc2c) — Bluesky · Sep 28 · score 145 · 14 comments 4. [Claude Opus 5.5 Should Raise Your Ambitions](https://thezvi.substack.com/p/claude-opus-55-should-raise-your) — AI newsletters (RSS) (Zvi) · Sep 26 · score 118 · 27 comments 5. [Ask HN: Do you think we'll ever have local models of Fable level?](https://news.ycombinator.com/item?id=49814142) — Hacker News · Sep 23 · score 3 · 3 comments 6. [Anthropic says Opus 5.5 matches Fable 5.1 “on most tasks” while costing about 40% less to run than Opus 5; Opus 5.5 costs $4/1M input and $20/1M output tokens](https://www.techmeme.com/260922/p38#a260922p38) — Techmeme (The Decoder) · Sep 22 · score 6 · 1 comment 7. [Externe Benchmarks: Claude Opus 5.5 überholt Astra von OpenAI und Fable 5.1 Anthropics neues KI-Modell Opus 5.5 hat sich in einem unabhängigen KI-Benchmark an die Spitze gesetzt. Dafür sind die Koste…](https://social.heise.de/@heiseonline/117331333229435289) — Mastodon (fediverse) (social.heise.de) · Sep 25 · score 6 · 1 comment 8. [Fable 5.1 costs twice as much as Opus 5, until your cache gets big enough](https://dev.to/szp2005/fable-51-costs-twice-as-much-as-opus-5-until-your-cache-gets-big-enough-4nd1) — DEV Community (dev.to) (#ai) · Sep 28 · score 1 · 1 comment 9. [Choosing a model through @Cursor in slack doesn't choose Fable 5.1](https://forum.cursor.com/t/choosing-a-model-through-cursor-in-slack-doesnt-choose-fable-5-1/173010) — Developer forums (Cursor, OpenAI, Hugging Face) (Cursor Forum) · Sep 25 · score 0 · 0 comments 10. [Anthropic to include Fable 5 usage in Pro plans](https://www.reddit.com/r/ClaudeAI/comments/1wp7ofj/) — Reddit (r/ClaudeAI) · Sep 24 · score 724 · 92 comments 11. [Opus 5.5 is my favorite model ever, by far](https://www.reddit.com/r/ClaudeAI/comments/1wqprkt/) — Reddit (r/ClaudeAI) · Sep 26 · score 553 · 167 comments 12. [Stupid question - if Opus 5.5 is better than Fable 5.1, why would we ever use Fable 5.1?](https://www.reddit.com/r/ClaudeAI/comments/1wnxeql/) — Reddit (r/ClaudeAI) · Sep 23 · score 512 · 137 comments ## Themes What its stories of the last 7 days are about: the 239 of them the Jev model kept as about the scene, by theme (a story can carry several themes): - [Models](https://abovethefog.app/themes/models.md) — 87% of its stories - [Agents](https://abovethefog.app/themes/agents.md) — 28% of its stories - [Usage & adoption](https://abovethefog.app/themes/usage_adoption.md) — 20% of its stories - [Companies & business](https://abovethefog.app/themes/companies_business.md) — 7.5% of its stories - [Security & safety](https://abovethefog.app/themes/security_safety.md) — 5.9% of its stories - [Protocols & infra](https://abovethefog.app/themes/protocols_infra.md) — 2.5% of its stories ## Related topics - **Made by:** [Anthropic](https://abovethefog.app/topics/anthropic.md) - **Part of:** [Claude](https://abovethefog.app/topics/claude.md) - **Competes with:** [GPT-6 Astra](https://abovethefog.app/topics/gpt6.md), [Gemini](https://abovethefog.app/topics/gemini.md), [Muse Spark](https://abovethefog.app/topics/muse_spark.md) - **Mentioned with:** [Claude Code](https://abovethefog.app/topics/claude_code.md) (78 stories), [GPT-5.6 Sol - Terra - Luna](https://abovethefog.app/topics/gpt56.md) (30 stories), [LMArena](https://abovethefog.app/topics/lmarena.md) (11 stories), [TypeSafe AI](https://abovethefog.app/topics/typesafe_ai.md) (7 stories), [AI in math](https://abovethefog.app/topics/ai_math.md) (6 stories), [Browser Use - browser agents](https://abovethefog.app/topics/browser_use.md) (5 stories) ## Hype score, last 30 days | Day | Hype score | Stage | |---|---:|---| | Sep 27, 2026 | 0 | 💤 Quiet | | Sep 26, 2026 | 9.6 | 💤 Quiet | | Sep 25, 2026 | 9.5 | 💤 Quiet | | Sep 24, 2026 | 1.1 | 💤 Quiet | | Sep 23, 2026 | 24.3 | 🧊 Cooling | | Sep 22, 2026 | 30 | 🚀 Rising | | Sep 21, 2026 | 19 | 🧊 Cooling | | Sep 20, 2026 | 18.9 | 🧊 Cooling | | Sep 19, 2026 | 8.8 | 💤 Quiet | | Sep 18, 2026 | 14.8 | 🧊 Cooling | | Sep 17, 2026 | 26.7 | 🔥 Hot | | Sep 16, 2026 | 16.8 | 🧊 Cooling | | Sep 15, 2026 | 19.3 | 🧊 Cooling | | Sep 14, 2026 | 38.5 | 🔥 Hot | | Sep 13, 2026 | 17.7 | 🧊 Cooling | | Sep 12, 2026 | 11.7 | 🧊 Cooling | | Sep 11, 2026 | 55.2 | 🔥 Hot | | Sep 10, 2026 | 60.1 | 🔥 Hot | | Sep 9, 2026 | 55.7 | 🔥 Hot | | Sep 8, 2026 | 61.7 | 🔥 Hot | | Sep 7, 2026 | 51.5 | 🔥 Hot | | Sep 6, 2026 | 41.6 | 🧊 Cooling | | Sep 5, 2026 | 60.9 | 🔥 Hot | | Sep 4, 2026 | 59.5 | 🔥 Hot | | Sep 3, 2026 | 76 | 🔥 Hot | | Sep 2, 2026 | 85.5 | 🚀 Rising | | Sep 1, 2026 | 75.7 | 🚀 Rising | | Aug 31, 2026 | 4.6 | 💤 Quiet | | Aug 30, 2026 | 0.8 | 💤 Quiet | | Aug 29, 2026 | 1.1 | 💤 Quiet | [Open Claude Fable - Mythos 5.1 in the interactive map →](https://abovethefog.app/#topic=claude_fable_mythos) --- Updated Sep 28, 2026, 22:02 UTC · Data: Above the Fog hype radar [HTML page](https://abovethefog.app/topics/claude_fable_mythos) · [llms.txt](https://abovethefog.app/llms.txt) · [About & methodology](https://abovethefog.app/about.md) · [Privacy](https://abovethefog.app/about.md#privacy)