Claude Fable 5.5 and GPT-6.2 Astra: the November Leak Watch

The evidence, graded (Nov 2)

• The LiteLLM trace — verified by direct read. In LiteLLM's model_prices_and_context_window.json, commit 2f3ccbe7c7 (2026-10-14 12:14 UTC) listed azure_ai/claude-fable-5-5: $10/1M input, $50/1M output, cache-read $0.25/1M, cache-creation $12.50/1M ($20 for above-1hr cache), 1,000,000 max input / 128,000 max output tokens, deprecation 2027-12-05, and per-query search-context pricing. By the commit sampled at 16:17 UTC the entry was gone; today's main branch carries fable-5 and fable-5-1 only, and no gpt-6.2 string anywhere.
• The Anthropic site residue — reported, then scrubbed. Per the APPSO roundup, on Nov 1 a user found "Mythos 5.5" in the Mythos product page's hidden H1 and image alt text; another counted six occurrences while the page copy still described Mythos 5.1; a third watched Anthropic remove it. Our direct checks confirm the aftermath: anthropic.com/mythos is a 404 and the Claude homepage contains no "Fable 5.5" or "Mythos 5.5" string.
• Where the names sit in the product line. Mythos is the tightly restricted high-risk-research line; Fable is the same base model with safety hardening for general availability (APPSO's framing). Our prior coverage anchors the ladder: the 5.5 generation is officially out for Sonnet/Haiku/Opus (family rollout), Opus 5.5 sits at $4/$20, and Fable 5.1 holds the $10/$50 tier with cache reads cut to $0.25 (cache-economics brief). A Fable 5.5 at the leaked numbers is a same-price successor, not a repricing.
• The Fable 5.5 demos — unverified by construction. Four X videos circulated: a 36-second 3D-scene comparison claiming Fable 5.5 beats Opus 5.5 on continuous animation; a 92-second first-person Minecraft-style world claimed built from one prompt in 1–2 hours; an interactive zero-shot historical sailboat; a Three.js car configurator. None shipped prompts, call logs or source. Treat as capability folklore until one is reproduced with receipts.
• GPT-6.2 Astra — screenshots all the way down. Reported sightings: a Codex usage split of ~80% GPT-6 Astra / 19.8% "GPT-6.2 Astra"; an API response with response.model: gpt-6.2-astra; a terminal invocation after a Codex CLI upgrade showing gpt-6.2-astra medium and a "1M window". Community verdicts split — one camp says it beats Opus 5.5 on design and coding, another says it trails Opus 5.5, let alone a rumored Fable 5.5. OpenAI has listed the model nowhere; a Nov-1 official video ("Many futures are possible. Which will you create?") fed the speculation without confirming anything.
• The November pile-up. The leaks land two days after Google DeepMind's Gemini 4 Carbon (Oct 28), amid concurrent rumors of Qwen4, GLM-5.5 and Hy4 — a coordinated-looking flagship cycle that APPSO reads as the usual pre-launch trace-or-tease ambiguity. Timing guesses for the Anthropic drop range from this week to mid-November.

Verification on Nov 2, 2026: LiteLLM git history and current branch read directly; anthropic.com/mythos and /claude fetched; OpenAI public channels checked for any gpt-6.2 listing (none). Demo videos and Codex screenshots are reported, not reproduced.

Context: what a real Fable 5.5 would mean for the price ladder

If the LiteLLM entry becomes an official rate card, the Western ladder reads: Haiku tiered from $0.10/$0.50, Sonnet $2/$10, Opus 5.5 $4/$20, Fable 5.5 $10/$50 — all 1M-context. That leaves the Fable tier at 2.5x Opus for the top general-availability slot, unchanged from 5.1. The cheaper structure for agents stays the same lever our Fable 5.1 brief documented: cache reads at $0.25 are what made agentic workloads ~45% cheaper, and the leaked entry keeps them there.

Against the Chinese shelf the gap is structural, not incremental: DeepSeek's V4.1-Flash serves $0.22/$0.66 off-peak with open weights, GLM-5.3 holds $1.40/$4.40, and even the rumored Fable's cache-read price alone is within 2x of full-price Chinese flagship input. That is the 6–18x bracket our earlier coverage measured, unchanged by a rumor (comparison table).

The GPT-6.2 side matters here mainly as a pacing signal: when the Western top tier iterates, the Chinese relays reprice within weeks — see GPT-6 Astra's China open-weights answer and the tri-model week brief. Watch the response, not the screenshot.

What this means for builders

Nothing to route yet: no official model id exists on any Anthropic or OpenAI endpoint, and no third-party relay — including this site's future service — should be trusted with a "fable-5-5" or "gpt-6.2" alias until a vendor rate card backs it. If you manage budgets, note the one actionable number: a same-price Fable successor with a 1M window would shift cost only through context growth, and cache-heavy agent designs stay the winning shape.

If you are benchmarking ahead of time, the honest protocol is the same one we apply here: screenshots are not evidence, gateway configs are traces not announcements, and a demo without logs is marketing. When the official pages land, we will publish the verified rate card within the day — as we did for the 5.5 family and Opus 5.5.

Four signals would flip this page from watch to launch coverage: an official Anthropic pricing row for fable-5-5, the LiteLLM entry returning to main, any GPT-6.2 listing on OpenAI's models page, or one of the demos reproduced with call logs. Any of them lands, this page updates.

Access from outside China — and the usual disclaimer

This site tracks Chinese model APIs for international builders: official endpoints, pricing and open-weights status, with the Western frontier as the comparison rail. The comparison table holds the live ladder; the cheapest-API guide holds the budget floor.

Independence disclaimer: ChinaModelAPI is an independent information site, not affiliated with Anthropic, OpenAI or any vendor. The LiteLLM entry is quoted from public git history; site residue, demos and Codex sightings are attributed community reports; nothing here is a routing, availability or pricing promise.

Primary sources

• LiteLLM commit 2f3ccbe7c7 (Oct 14, 2026) — the azure_ai/claude-fable-5-5 entry in model_prices_and_context_window.json, read directly
• APPSO report, Nov 2026 — Mythos 5.5 site residue, Fable 5.5 demos, GPT-6.2 Astra sightings and community reactions
• anthropic.com/claude (checked Nov 2, 2026 — no Fable/Mythos 5.5 string; /mythos returns 404)
• 站内对照：Fable 5.1 缓存经济学 · Claude 5.5 家族价目 · Opus 5.5 上线 · GPT-6 Astra 与中国开源回应

FAQ (2026)