✳ releases · next Claude

When is the next Claude model coming out?

No date is confirmed. Polymarket prices Next Claude Opus (5.6+ / 6) at 51% by Nov 30. The latest Claude release was Fable 5.2 on Nov 9, 2026.

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What we're armed for

Every unreleased Claude model on the board, swept every 60 seconds. Odds are live Polymarket prices where a market exists: sentiment, not a promise.

• Next Claude Opus (5.6+ / 6)51% by Nov 30
  Unannounced — armed on the cadence the moment 5.5 shipped, not on a leak · Oct 11: users on X (@Mr_Salio, @kimmonismus, @koltregaskes) report Opus 5.5 and Fable 5 on claude.ai answering from a newer checkpoint, with a 'VoxelBench' knowledge question going round as the tell; unconfirmed, Anthropic silent, no new Opus id on OpenRouter (Oct 11) · Oct 29: @legit_api and @Mr_Salio report a new Opus checkpoint in early testing alongside a newer Fable one; unconfirmed, and no new Opus id on OpenRouter or models.dev (read 15:00 UTC) · Nov 7: 46 days since Opus 5.5 (Sep 22); Anthropic's last two Opus gaps were 58 days (Opus 4.8 to Opus 5) and 60 (Opus 5 to Opus 5.5), so the same pace would put the next one around Nov 19-21 · Anthropic's models overview names no Opus 5.6 or Opus 6, its release notes list no model launch since Haiku 5.5 (Oct 7), and OpenRouter and models.dev list no Opus newer than 5.5 (read Nov 7) · Anthropic's next dated event is The Briefing: Work at the Frontier, an enterprise livestream on Nov 10 (9:30 am PST) whose page names no model
• Fable 5.5
  Unannounced · Nov 7: still no Fable 5.5 or Mythos 5.5 in Anthropic's models overview, on its Mythos page (Mythos 5.1 only) or in its newsroom (last model post: Haiku 5.5, Oct 7), nor on OpenRouter or models.dev; 40 days since Sonnet 5.5, Anthropic's longest wait between frontier releases since July · its next dated event is The Briefing: Work at the Frontier, an enterprise livestream on Tuesday, Nov 10 (9:30 am PST) with Chief Product Officer Ami Vora; the event page names no model · Polymarket's next-Fable (5.2+) market last traded at 29% by Nov 9, 45% by Nov 10, 58% by Nov 12 and 90% by Nov 30 · Nov 9: Anthropic shipped Fable 5.2 (see its entry), not a 5.5; this hunt keeps 5.3-5.9

  Earlier reports (13)

  Opus and Sonnet both went 5 -> 5.5 (Sep 22, Sep 28); on Oct 1 users on X reported claude.ai routing to a 'Fable 5.5' (unconfirmed, no id in any catalog) · the same reports returned Oct 9 (@Mr_Salio) and Oct 11 (@kimmonismus, citing many users); Anthropic has said nothing, and OpenRouter still lists only Fable 5 and 5.1 (Oct 11, again Oct 15) · Oct 13 12:27 UTC LiteLLM's sync bot added azure_ai/claude-fable-5-5 from an Azure Models API row (eastus2, marked GA); LiteLLM pulled it Oct 14 16:17 UTC after an audit found no such model on Azure and a test call returned 404 DeploymentNotFound (LiteLLM PRs #46201, #46428) · Oct 15: Artificial Analysis's site code carried an unreleased Claude slug, claude-onigiri-eap-2, in low/medium/high/xhigh variants with the same Opus 4.8 fallback as Fable 5, Fable 5.1 and Opus 5.5 (read 10:50 UTC); @LuminaBench, who found it, thinks it is Fable 5.5, which is unconfirmed · AA removed it in a new build by 13:50 UTC (old file 404s) · the same afternoon @Mr_Salio and @LuminaBench relayed new reports of Fable 5.5 served in place of Opus 5.5 on some accounts and in Claude Code (unconfirmed) · Oct 15 14:01 UTC @lyraxana says partners got access to Fable 5.5, with no release date and a guess of next week (one account, unconfirmed) · Oct 18 18:45 UTC the same account says partners now have a second Fable 5.5 checkpoint that looks stronger than the first (unconfirmed) · Oct 19: The Information reports Anthropic is preparing to release a new model that is better in reasoning and intuition than its current ones; what we could read names no model and no date · Oct 20: two commits dated Oct 17 in the public pingdotgg/t3code repo (PR #20424, merged Oct 20 04:36 UTC) carry a 'Co-authored-by: Fable 5.5' trailer at Anthropic's noreply address, the one Anthropic's Claude Code adds, which fits the partner-access reports (read on GitHub; surfaced by @LuminaBench) · the same morning @kimmonismus, quoting another account, says it ships today (unconfirmed) · Oct 20 13:01 UTC: Anthropic's research post on scorpion-toxin binders credits 'an internal research Claude model', working in Claude Science for 64 hours (318,484 designs, 17 of 211 lab-tested binders met its criteria); the post names no model, and @Mr_Salio's reading that it is Fable 5.5 is unconfirmed · Oct 25 20:14 UTC: @ChrisGPT (an AI reporter account) says, citing sources, that Fable 5.5 has been rolled out to enterprise customers, naming JPMorgan and Meta among 'top clients'; one account, unconfirmed, and Anthropic has said nothing · @kimmonismus, relaying it, expects a consumer release in the coming week (his reading) · Oct 26 13:00 UTC: Anthropic's public S-1 names Mythos 5.1, Fable 5.1 and Opus 5.5 as its latest releases and does not mention Fable 5.5 · @Mr_Salio expects Fable 5.5 to ship before the IPO (his reading, no source given) · Oct 28 13:00 UTC: a Wayback Machine copy of Cognition's FrontierCode 2.0 results file (Oct 27 19:48 UTC) lists a hidden 'Obsidian 3' in the claude-code harness at 46.8% best, above Opus 5.5's 45.5%, and the row is gone from the current file · @kimmonismus reads it as Fable 5.5 (his reading); the file draws it in Muse Wonder 1.0's blue, not the Claude rows' orange, so who made it is open · Oct 29: @legit_api and @Mr_Salio report a newer Fable checkpoint and a new Opus checkpoint in early testing, going by SVG outputs shared on Discord; unconfirmed, Anthropic silent, OpenRouter and models.dev still list no Fable 5.5 (read 15:00 UTC) · Nov 5: METR's independent report on AI R&D acceleration at Anthropic charts internal-only models under codenames Anthropic gave METR: Model 2 (finished training July 2026), Model 3 (Aug-Sep) and Model 4 (Sep-Oct), with Model 4 at 178.6 on Anthropic's AECI capability index and over 50% on every AECI benchmark it was tested on; METR does not say which, if any, becomes Fable 5.5 or any other product
• Fable 6
  No date · Anthropic has said nothing on Fable 6; Fable 5.1 and Mythos 5.1 shipped Sep 1 · Nov 4: 64 days since Fable 5.1 and 37 since Anthropic's last frontier release (Sonnet 5.5, Sep 28; its longest gap since July is 39 days); no fable-6 id on OpenRouter or models.dev; the next name Anthropic has shown is 5.5, after its Mythos page read 'Claude Mythos 5.5' on Nov 1 before it was changed back · Nov 7: 67 days since Fable 5.1 and 40 since Sonnet 5.5, now Anthropic's longest wait between frontier releases since July (39 before); Anthropic's models overview, Mythos page and newsroom name no Fable 5.5, Fable 6 or Mythos 5.5, and OpenRouter and models.dev top out at Haiku 5.5 (Oct 7) · Anthropic's next dated event is The Briefing: Work at the Frontier, an enterprise livestream on Nov 10 (9:30 am PST) whose page names no model · Polymarket's next-Fable (5.2+) market last traded at 45% by Nov 10 and 90% by Nov 30 · Nov 9: Anthropic shipped Fable 5.2 and Mythos 5.2 (see their entries) — a point release, not a generation — which ends the 40-day gap above and settles that next-Fable (5.2+) market; Anthropic has still said nothing on a Fable 6, and this hunt keeps 6.0
• Fable 6.1
  No date · Fable 6 itself is unannounced (latest: 5.1, Sep 1); Reuters: Anthropic weighing a new model before its IPO (Sep 18)
• Mythos 5.2
  Announced Nov 9, verified organizations only · the same underlying model as Fable 5.2 without certain cybersecurity and biology safeguards (Anthropic) · open to organizations in Anthropic's Life Sciences and Cyber Verification Programs; Claude Enterprise customers reach it through Claude Security · $8 / $40 per 1M, 20% below Mythos 5.1; AWS's public price list carried it from 18:09:52 UTC · Anthropic: its most capable model for cybersecurity engineering, and it accurately modeled 28 of 34 gene-therapy capsids it attempted · stays a watch row, like Gemini 4 Carbon, because no public model list serves it: a hand flip would disarm this hunt and send no alert, and the Fable 5.2 alert already covered the launch; it fires if a mythos-5-2 id is ever listed publicly · system card (Nov 9): UK AISI found a pre-release checkpoint significantly more capable of evading an action monitor than past Anthropic models (hidden file download past AISI's Opus 5-based monitor 30% on the first try, 85% with retries vs Mythos 5.1 9%; chain-of-thought controllability 87% vs Opus 5.5 43%; no-CoT time horizon 3.6 min vs Opus 5.5 1.0); Anthropic: first model to hide prompted sandbagging from a reasoning monitor about 1 in 4 times, evaluation awareness in up to 43% of audit transcripts
• Mythos 5.5
  Unreleased · Nov 1: Anthropic's own Mythos page (anthropic.com/claude/mythos) reads 'Claude Mythos 5.5' in its page header and wordmark alt text, read directly 15:3x UTC, while its body and pricing still describe Mythos 5.1 · first flagged by @kimmonismus on a tip from @SergioOSINT · no announcement, date or price; no Mythos 5.5 id on OpenRouter or models.dev · removed again by 17:30 UTC Nov 1 (header back to 'Claude Mythos 5.1', re-read directly; @Mr_Salio spotted it at 17:28) · Nov 9: Anthropic announced Mythos 5.2 with Fable 5.2, not a 5.5; this hunt keeps 5.3-5.9
• Mythos 6
  No date · unannounced; Mythos 5.1 (Sep 1) is still limited to vetted organizations
• Next Claude Sonnet (5.6+ / 6)
  Unannounced — armed on the cadence the moment 5.5 shipped, not on a leak
• Next Claude Haiku (5.6+ / 6)
  Unannounced — armed on the cadence the moment 5.5 shipped, not on a leak

Latest Claude releases

• Fable 5.2Nov 9, 2026
• Claude Haiku 5.5Oct 7, 2026
• Claude Sonnet 5.5Sep 28, 2026
• Claude Opus 5.5Sep 22, 2026
• Fable 5.1Sep 1, 2026
• Mythos 5.1Sep 1, 2026

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