Unverified50% confidenceReleaseExact time

Anthropic launched two models, Fable 5.2 and Mythos 5.2, sharing the same origin and architecture, with the entire lineup natively equipped with a 1 million Token context window and a maximum output of 128,000 Tokens.

1

Sources

50%

Confidence

Short-term (~14 days)

Relevance

11/12/2026

First Seen

Valid until: 11/26/2026

Sources

Gemini 4 Carbon Arrives: The LLM Race Enters the Era of Million-Token Context and Trillion-Parameter Open Source

bilibili魔都帝少11/11/2026

Related Entities

Anthropiccompany Fable 5.2model Mythos 5.2model

Related Claims

UnverifiedThe LongCat 2.5 preview version offers an ultra-long context window of up to 1 million tokens.66% similar UnverifiedFable 5.2 offers a 1 million token context window.65% similar UnverifiedThe full version of EmbeddingGemma 2 has 740 million parameters, the text-only version has 270 million parameters, supports over 100 languages, and has a context window of 8K.62% similar VerifiedThe context windows of current mainstream models already support 100,000 to 2,000,000 tokens.57% similar

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