Anthropic Rumored to Test Claude Fable/Mythos 5.5 Ahead of IPO, OpenAI A/B-Tests GPT-6.2 Astra

Anthropic (latest)November 2, 2026en

Anthropic (latest)

AI Global Wire

Headline: Leaks indicate Anthropic may be quietly testing Claude Fable 5.5 and Mythos 5.5 — OpenAI rumored to A/B test GPT‑6.2 AstraRumors are swirling that Ant

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• OpenAI
• Anthropic
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