Anthropic’s Three Cards Surface: Mythos 1 Appears, Opus 4.8 Spotted

Anthropic三张底牌全翻了！Mythos 1首次现身，Opus 4.8曝光

Xinzhiyuan says Anthropic’s claude-opus-4.8 appeared in Google Vertex AI, while a 59.8MB Claude Code source-map leak with 512,000 TypeScript lines exposed Sonnet 4.8 references and Mythos 1 clues tied to Claude Code and Claude Security.

Why it matters: HKR-H/K/R all pass, but this is a leak plus Vertex listing, not an Anthropic launch. No capability numbers, pricing, context window, or reproducible evals, so it stays in the 78–84 band.