Claude Fable 5.5 vs GPT-6/Opus 5.5: Price, Specs, Verdict

Claude Fable 5.5 vs GPT-6/Opus 5.5: A Fresh Fable Pretraining Run Against Opus 5.5's 58-Point Index Score

Claude Fable 5.5 is Anthropic's next flagship Fable-class model. As of October 14, 2026 it had not been officially released, and it has no published benchmarks or confirmed pricing. Claude Opus 5.5 shipped on September 22, 2026 and leads the Artificial Analysis Intelligence Index at 58 points. GPT-6 Astra is OpenAI's current shipping flagship. Early community testing suggests Fable 5.5 is stronger at creative coding and one-shot 3D and animation work, while Opus 5.5 is the cheaper, confirmed everyday model. The right pick depends on whether you need a documented, shipping model today or are willing to pay a premium for unbenchmarked peak capability.

Key Takeaways

• Fable 5.5 is unconfirmed. Anthropic made no announcement through October 14, 2026. The strongest evidence so far is an Azure East US 2 catalog entry marked "GenerallyAvailable" on October 13.
• Opus 5.5 is the only model of the three with a public score in the sources reviewed: 58 points on the Artificial Analysis Intelligence Index.
• The $10/$50 per million tokens, 1M-context and 128K-output figures are probably not Fable 5.5's real specs. Several analysts say they were inherited from Fable 5.1's config.
• Every "beats GPT-6" and "beats Opus 5.5" claim is anecdotal. No reproducible head-to-head test exists yet.
• GPT-6.1 Astra, OpenAI's likely answer, is reportedly delayed over safety concerns. That claim is also unverified.

Claude Fable 5.5 vs GPT-6/Opus 5.5 at a Glance

Dimension	Claude Fable 5.5	Claude Opus 5.5	GPT-6 Astra
Status (Oct 14, 2026)	Not announced; Azure catalog listing Oct 13	Released Sept 22, 2026	Released (listed as shipped by Sept 2026)
Intelligence Index	Unverified, no public number yet	58 points (#1, per @TJeparskis)	Unverified, no public number in reviewed sources
API price (per 1M tokens)	Not yet confirmed ($10/$50 is Fable 5.1's inherited value)	Unverified number; community calls it "cheaper than Opus 5"	Unverified, no public number yet
Context / max output	Not yet confirmed (1M / 128K inherited from Fable 5.1)	Unverified, no public number yet	Unverified, no public number yet
Reported strength	Creative coding, 3D, SVG, animation (community testing)	Coding, everyday reliability (community opinion)	Not documented in reviewed sources
Evidence tier	Leaks + anecdotal routed tests	Official release + third-party index	Official release only

Status and Evidence: What Is Actually Confirmed

The most concrete sign of Fable 5.5 is the Azure Catalog Leak. On October 13, 2026, "claude-fable-5-5" appeared in Azure's East US 2 catalog with a GenerallyAvailable status. It surfaced through an automated LiteLLM price-sync PR, as @themacrosift documented. Chris flagged the same listing and warned that the attached specs were inherited.

Source: @ChrisGPT

The listing reportedly carries a retirement date of December 5, 2027, according to @buildwithhassan. One single-source claim from @xiax0603 says Azure ARM records show registration on September 28 across 9 regions. No one else has corroborated it.

A second signal is the Rolling Fable Selector. Lumina reported that Claude Code now saves a rolling "Fable" choice that follows the newest model instead of pinning a version. The same pattern appeared before the Opus and Sonnet 5.5 launches.

Source: @LuminaBench

The weakest signal is the Tibo Canary, a prompt asking the model whether it knows "tibo the reset guy" without searching. ML_Bear ran it against the claude-fable-5.1 API and got a correct answer, which undercuts it as a test for identifying 5.5. A model's description of itself is not proof of its identity. A docs URL for "fable-5-5" was also shared as evidence, but an independent check found it returned the docs site's generic empty shell.

For Opus 5.5, the facts are simple. It launched on September 22, 2026, with Sonnet 5.5 and Haiku 5.5 following. For GPT-6 Astra, the reviewed sources confirm it shipped but publish no specs. Its successor GPT-6.1 Astra was reportedly finished and then "postponed due to security concerns," according to kimmonismus. Our GPT-6.1 Astra safety-pull deep dive covers that story.

Capabilities: Community Testing vs Shipping Reality

Opus 5.5 is the only model in this comparison with a public third-party score: 58 points on the Artificial Analysis Intelligence Index, per @TJeparskis. A Grok-assisted daily brief from TestingCatalog also reported Gemini 4 Argon scoring 52.8% on CursorBench, "on par with Opus 5.5." That gives Opus 5.5 a rough coding reference point. For how Opus 5.5's index score compares with another challenger, see our Muse Wonder vs Claude Opus 5.5 breakdown.

Fable 5.5 has zero published benchmark scores. Everything below comes from users who believe they were silently routed to it while the UI still showed Fable 5.1, which the community calls Silent Routing:

• Creative coding and 3D. Testers posted one-prompt animations, a playable Minecraft-style artifact, and Three.js/Blender scenes. Mark Kretschmann noted that the reported jump is "especially striking in motion design and creative coding."
• Less prompting. J A Z I I described the model as "faster than current model," needing less prompting, and "still expensive tho."
• Efficiency vs Opus 5.5. One tester claimed better token efficiency and fewer tool calls than Opus 5.5. This is a single, anecdotal test.
• Skeptical read. Teortaxes argued that "much of the awesome 5.5 web art is bruteforce," and Harshith warned that standard SVG tests such as controllers and pelicans no longer separate Opus 5.5 from Fable 5.5.

Fable 5.5 has strong pre-release buzz and no published measurements, so treat its demos as evidence of interest, not proof of capability.

Leakers also describe Fable 5.5 as the first fresh pretraining run for the Fable class, which they call the Fresh Fable Pretraining claim. Anthropic has not confirmed it. Features attributed to the Azure listing, Adaptive Thinking and computer use, are also unconfirmed for 5.5.

Pricing and Limits

None of the three has a confirmed per-token price in the reviewed sources, so the price comparison is directional:

• Fable 5.5: The widely shared $10 input / $50 output per million tokens, 1M context and 128K max output figures are, per @Merliiin__, "copied from Fable 5.1." Treat them as Fable 5.1's numbers.
• Opus 5.5: Community posts describe it as "cheaper than Opus 5" and "insanely cheap compared to fable." Ananth argued that this is why Opus 5.5 "has become the everyday model for many."
• GPT-6 Astra: No price appears in the reviewed sources.

If Fable 5.5 keeps Fable 5.1's $10/$50 structure, its output tokens would cost 5x its input tokens. That is the main cost risk for agent loops with heavy output. Bindu Reddy predicted that Fable 5.5 and Astra 6.1 "will cut prices," which is a guess, not a confirmation.

Availability and Access

Route	Claude Fable 5.5	Claude Opus 5.5	GPT-6 Astra
Vendor app / official API	Not live; possible Silent Routing for some Fable 5.1 users	Live via Anthropic	Live via OpenAI
Microsoft Azure / Foundry	Catalog entry spotted Oct 13, then reportedly removed	Not covered in reviewed sources	Not covered in reviewed sources
kie.ai API	Not listed; kie.ai offers the earlier Claude Fable 5 via API	Not covered here	Not covered here

Prediction markets cited by @Atlantislq put "Fable 5.2+ by Oct 17" at 47.5% and "by Oct 21" at 79.5%. @Mavrohw noted that Opus 5.5 shipped about 2 days after its own Azure catalog leak. An October 6 launch rumor passed with no release, so timing claims deserve caution.

Which One Should You Use?

Choose Claude Fable 5.5 if:

• Your work is creative coding, 3D scenes, motion graphics, or interactive artifacts, the areas where early community testing reports the largest gains.
• You can wait for the official release and accept a likely Fable-tier price.
• You want to test whether less prompt scaffolding lowers your own iteration costs.

Choose Claude Opus 5.5 if:

• You need a released model with a public score today: 58 points on the Intelligence Index.
• Cost matters. Community reports consistently place Opus 5.5 well below Fable pricing.
• You run high-volume coding or agent work where usage limits matter more than a capability ceiling.

Choose GPT-6 Astra if:

• Your stack already depends on OpenAI tooling and you need a shipping flagship now.
• You plan to evaluate GPT-6.1 Astra when it lands rather than switch vendors mid-cycle.

Frequently Asked Questions

Is Claude Fable 5.5 better than Claude Opus 5.5?

No public benchmark shows it yet. Early community testers report stronger creative coding and 3D output from Fable 5.5, but Opus 5.5 is the only one of the two with a published score: 58 points on the Artificial Analysis Intelligence Index.

Is Claude Fable 5.5 better than GPT-6?

That is unverified. Claims that Fable 5.5 beats GPT-6 Astra or GPT-6.1 Astra come from pre-release leaks and individual testers. No head-to-head benchmark had been published as of October 14, 2026.

Is Claude Fable 5.5 cheaper than Claude Opus 5.5?

Very unlikely, though its official price is not yet confirmed. Community users describe Opus 5.5 as far cheaper than the Fable tier, and routed testers called Fable 5.5 "still expensive." The $10/$50 figure is inherited from Fable 5.1.

Has Claude Fable 5.5 been released?

Not officially as of October 14, 2026. It appeared in Azure's East US 2 catalog as GenerallyAvailable on October 13, and some users report Silent Routing, but Anthropic has confirmed no launch date.

What is Claude Fable 5.5's context window?

Not yet confirmed. The 1M-token context and 128K-token output figures in the Azure listing appear to be copied from Fable 5.1's configuration.

Can I use Claude Fable 5.5 through an API?

There is no confirmed public endpoint yet. Opus 5.5, GPT-6 Astra, and earlier Fable models are available today, including Claude Fable 5 via kie.ai's API.

What to Watch Next

Three signals will settle this comparison. The first is an official Anthropic model page with real Fable 5.5 pricing and context limits to replace the inherited Fable 5.1 numbers. The second is a Fable 5.5 entry on the Artificial Analysis Intelligence Index to compare against Opus 5.5's 58 points. The third is the GPT-6.1 Astra release, which several posts expect within OpenAI's "28 days of shipping" window. This page will be updated as each one lands.

Try related models on Kie.ai: Claude Fable 5.1 (Coming Soon), Claude Opus 5.5 and GPT-6 Astra.