Claude Fable 5.5 leaks on Azure catalog: 1M context, 128K output, $10/$50 pricing

新智元 · wechat · 2026-10-16

Developers spotted claude-fable-5-5 listed as Generally Available in Azure's East US2 model catalog, with a matching LiteLLM commit — suggesting an imminent full release.
Leaked specs: 1M token context, 128K max output, priced at $10/$50 per million tokens, the priciest tier in the Claude 5.5 family.
Canary test: ask Opus 5.5 High about VoxelBench and @legitapi; if it answers correctly, you're routed to the new model.
Community demos: a playable MMORPG in 5 hours, pure-code 3D animation explaining math proofs, a fully code-driven 2.5-hour animated short, and a 9m38s four-movement symphony with per-note video.
The timing shadows Gemini 4 Argon's Oct 14 launch, read as a deliberate snub; leaks also claim OpenAI will push 6.1 Astra during its 28 Days of Shipping.
Anthropic's engineering blog reports daily code merges jumped from 2,500 in May to 30,000+ in September, forcing a Git replacement built for agents — fueling the "AI building AI" narrative behind Fable 5.5.
Skeptics note the LiteLLM sync isn't a second source, and GA listing doesn't mean same-day announcement.

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