Checked November 12, 2026 — still no Claude Fable 5.5
The newest Fable is Claude Fable 5.2 (claude-fable-5-2), released November 9, 2026 at $8 in / $40 out per MTok with a 1M-token context window and 128K max output. Anthropic's models page, platform release notes and pricing page list no model called Fable 5.5. If one ships, this page is updated on the same URL.
Read the confirmed Fable 5.2 specsRumor tracker · checked November 12, 2026
Claude Fable 5.5: what's known, what's rumored
Anthropic has not announced a model called Claude Fable 5.5. The next Fable shipped on November 9, 2026 as Claude Fable 5.2. Here is the dated evidence trail, what the leaks did and did not show, and how the name sits next to Fable 5.2 and Opus 5.5.
TL;DR
Claude Fable 5.5 is not released and has never been announced. As of November 12, 2026 Anthropic's models page and release notes list Fable 5.2 (released November 9, $8 in / $40 out per MTok), Opus 5.5, Sonnet 5.5 and Haiku 5.5 — no 5.5 Fable. The name comes from October leaks: a claude-fable-5-5 row in an Azure catalogue on October 13 that carried Fable 5.1's figures and was pulled a day later, a hidden "Mythos 5.5" title in Anthropic's own site code on November 1, and a handful of client-side artefacts. Anthropic has not said whether a 5.5 exists, so this page quotes no Fable 5.5 price, context window, benchmark or date.
Timeline: how the Fable 5.5 name spread
Each row is one dated sighting, labelled by what kind of evidence it is. Only two rows are Anthropic's own announcements.
| Date | What happened | Evidence |
|---|---|---|
| Sep 2, 2026 | Anthropic releases Claude Fable 5.1 (claude-fable-5-1) at $10 / $50 per MTok — the newest Fable until November 9. | Official — Anthropic |
| Oct 11, 2026 | Users report that Opus 5.5 requests are being answered by a stronger, unnamed model; some posts call it Fable 5.5. | Reported — user posts |
| Oct 13, 2026 | A claude-fable-5-5 row appears in Microsoft's Azure East US 2 model catalogue marked generally available. A LiteLLM sync commit copies it into the price file with Fable 5.1's $10/$50, 1M context and 128K output, noting the figures were inherited. | Reported — cloud catalogue row |
| Oct 14, 2026 | LiteLLM removes the entry after Azure checks in six regions find no Fable 5.5; a test request returns DeploymentNotFound. Anthropic and Microsoft say nothing. | Reported — entry withdrawn |
| Oct 15, 2026 | A leaker claims partners already have the model. The codename claude-onigiri-eap appears briefly in a third-party leaderboard frontend, then disappears. | Reported — single leaker |
| Nov 1, 2026 | A hidden "Mythos 5.5" title and logo alt text appear six times in the HTML of Anthropic's Mythos page, while the visible page still reads 5.1. It is gone within a day. | Reported — hidden site text |
| Nov 9, 2026 | Anthropic ships Claude Fable 5.2 and Claude Mythos 5.2 — not 5.5. The hidden title on the Mythos page now reads 5.2, and the launch post never uses the name 5.5. | Official — Anthropic |
| Nov 12, 2026 | This check: Anthropic's models page, platform release notes and pricing page list no Fable 5.5; the name appears in no official page, model ID list or rate card. | Verified — Anthropic pages, Nov 12 |
Two of these rows are Anthropic's own: the Fable 5.1 release and the Fable 5.2 launch. Everything between them is third-party observation. A catalogue row, a codename and a hidden page title are artefacts of a launch being prepared; none of them is an announcement, and none establishes a release date, a price or a capability.
What is published about "Claude Fable 5.5"
Short answer: nothing. This is the list of fields that would appear on a model page, and every one of them is missing.
| Field | Status as of November 12, 2026 |
|---|---|
| Model ID | Not published — no claude-fable-5-5 entry on Anthropic's model list or docs. |
| Release date | No date from Anthropic. Every October window that leakers named passed without a launch; the Fable that shipped arrived on November 9 as 5.2. |
| Price | Not published — no rate card in any tier. The $10/$50 figure in circulation is Fable 5.1's, copied during a catalogue sync. |
| Context window and max output | Not published — the 1M / 128K figures in circulation are also Fable 5.1's. |
| Benchmarks | Not published — no scores, no system card, no evaluation table. |
| API and cloud availability | Not in Anthropic's model list, not on Bedrock, Google Cloud, Foundry or the Claude apps. |
| Data retention | Not published — retention class cannot be inferred from the 5.2 or 5.1 pages. |
| The name itself | Anthropic has never used it in a post, doc or model ID. The version number came from leaks, not from Anthropic. |
Anything beyond this table — a rate, a window, a benchmark percentage — would be a guess. This page does not print guesses; every number on it comes from the model registry and belongs to a model that exists.
Fable 5.5 vs Fable 5.2 vs Fable 5.1 vs Opus 5.5
Only the three released models have numbers. Rates, windows and retention below come from this site's model registry, verified against Anthropic's pages on the dates shown.
| Spec | Fable 5.5 (rumored) | Fable 5.2 | Fable 5.1 | Opus 5.5 |
|---|---|---|---|---|
| Model ID | Not published | claude-fable-5-2 | claude-fable-5-1 | claude-opus-5-5 |
| Released | No date | 2026-11-09 | 2026-09-02 | 2026-09-22 |
| Input (per MTok) | Not published | $8.00 | $10.00 | $4.00 |
| Output (per MTok) | Not published | $40.00 | $50.00 | $20.00 |
| Cache hits (per MTok) | Not published | $0.20 | $0.25 | $0.20 |
| Context window | Not published | 1M | 1M | 1M |
| Max output | Not published | 128K | 128K | 128K |
| Data retention | Not published | 30-day mandatory | 30-day mandatory | Not stated on Anthropic's pricing page |
The Fable 5.5 column is empty on purpose: Anthropic has published no rate, window or spec, so there is nothing to fill it with. Registry dates — Fable 5.2 2026-11-11, Fable 5.1 2026-09-14, Opus 5.5 2026-10-08. Opus 5.5's retention is listed as not stated because Anthropic's pricing page does not state it, not because it is zero.
The numbers you have seen are Fable 5.1's
One figure travelled further than any other: $10 in, $50 out, 1M context, 128K output.
That is Claude Fable 5.1's profile, not a Fable 5.5 specification. It entered circulation on October 13, 2026, when a claude-fable-5-5 row was synced from an Azure catalogue into LiteLLM's price file; the commit itself notes that the pricing, limits and capabilities were carried over from the existing Fable 5.1 entry because there was no source for Fable 5.5's own. A day later the row was removed after Azure checks found no matching model. The current Fable, 5.2, prices at $8.00 in and $40.00 out per million tokens with 1M of context and 128K of output — 20% below 5.1. If a Fable 5.5 ships, its rates will come from Anthropic's pricing page, not from a synced catalogue row.
The leaked row also carried a December 5, 2027 retirement date and cache rates of $12.50 write / $20 one-hour write / $0.25 read per MTok — all Fable 5.1 numbers. Treat any Fable 5.5 rate card in circulation as a placeholder until Anthropic publishes one.
What to do while the name is unconfirmed
An unannounced version number is not a reason to change production traffic.
Stay on documented IDs
claude-fable-5-2, claude-fable-5-1 and claude-opus-5-5 are the IDs Anthropic documents today. A model you cannot call is not a migration target, and the four breaking changes between 5.1 and 5.2 are already enough to test before moving.
Wait for three receipts
A launch post on anthropic.com/news, a model ID in Anthropic's model list, and a row on the pricing page. Any one alone is not enough — the October catalogue entry satisfied none of them.
Check it yourself in one call
Anthropic's models endpoint is the fastest public check: a GET https://api.anthropic.com/v1/models with your key returns the IDs your account can call. If claude-fable-5-5 is not in that list, it is not available to you, whatever a screenshot says.
Price the models that exist
If what you want is the strongest Fable, Fable 5.2 is 20% cheaper than 5.1 on both input and output. If you want the cheapest way to do most work, Opus 5.5 is half of Fable 5.2 on input and output — Anthropic's own guidance is to start there and move up only when it misses.
This page tracks a rumour; it does not price it. When Anthropic publishes a Fable 5.5 model page with a rate card, that row goes into the model registry and every table here fills in from it.
Sources checked on November 12, 2026
Anthropic's own pages first, then the artefacts the rumour rests on.
- Anthropic: Introducing Claude Fable 5.2 and Mythos 5.2
The November 9, 2026 launch post. Names claude-fable-5-2, $8/$40 and availability on AWS, Google Cloud and Azure — and never mentions 5.5.
- Anthropic models list
Model announcements end at Haiku 5.5 (October 7, 2026). No Fable 5.5 entry.
- Claude Platform release notes
Newest model entries are Fable 5.2 and Mythos 5.2 (November 9). No 5.5.
- LiteLLM commit 7dd53d6, October 13, 2026
The commit that added azure_ai/claude-fable-5-5 to the price file, stating that its pricing, limits and capabilities were inherited from the Fable 5.1 entry.
- The correction, October 14, 2026
The removal request: Azure checks in six regions found no Fable 5.5, East US 2 listed Fable 5 and Fable 5.1, and a test deployment returned DeploymentNotFound.
- The hidden "Mythos 5.5" title, November 1, 2026
Archive comparison of Anthropic's Mythos page showing the hidden title and logo alt text, and that both were gone within a day.
- Release-gap arithmetic, November 12, 2026
Fable 5 shipped on June 9, 2026 and Fable 5.1 on September 2 — about twelve weeks. Fable 5.1 to Fable 5.2 was September 2 to November 9, about ten. Nothing in that pattern is a schedule, and this page does not turn it into a date.
Last checked November 12, 2026. Anthropic has not said whether a Fable 5.5 exists. When it publishes a model page, this page is updated in place — same URL, new date — rather than replaced by a news post.
Use the model that exists
Fable 5.2 is out, documented and priced. The pages below have the specs, the rate card and the comparison with Opus 5.5.