GPT 6 Astra beats Claude Fable 5.2 at chess, mating on move 76 as White
StorageThese9556 · reddit · 2026-11-16
A Reddit user ran another AI chess match, this time with the newest models: GPT 6 Astra (Codex CLI) as White vs Claude Fable 5.2 (Claude Code) as Black, both at high effort with fresh sessions and no engines or tools.
- Result 1-0: Astra mated on move 76 after Fable, a bishop up, dropped its queen to a careless check.
- Timing gap: Astra burned Codex's entire 5-hour limit on one game; Fable used 65.8% of total thinking time vs Astra's 34.2%, driven by a few 3.5-minute deep thinks.
- Running score: Astra is now 3-0 against Claude-family models; the only loss in the series was GPT 6.1 Sol losing to Claude Opus 5.5.
- The chessboard setup is open-sourced at github.com/andriy-viyatyk/persephone-boards.
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