Hidden model "Obsidian 3" scores 46.8% in Cognitions data, rumored to be Anthropic's Fable 5.5
YashasGunderia · x · 2026-10-28
Citing Cognitions data, kimmonismus reports a hidden model "Obsidian 3" found in FrontierCode 2.0 scoring 46.8% vs. #1 Opus 5.5's 45.5%; since it runs in the claude-code harness used exclusively by Claude models, it's speculated to be Fable 5.5. A replier counters it's likely just Opus 5.6, with Fable being a far bigger leap. Unverified speculation.