Artificial Analysis rated GPT-6 Astra: Coding Agent Index 67 in Codex, roughly matching Claude Opus 5 / Fable 5 in Claude Code and Muse Spark 1.3 in Muse Code, with ~70% better token efficiency vs GPT-5.6 Sol (max). List price rises to $10/$50 per 1M in/out (2.5× Sol), yet per-task cost stays well below Fable 5. Intelligence Index stays 61, tied with Sol.

Key Takeaways

  • ✓Coding Agent Index: 67 in Codex, near Opus 5 / Fable 5 / Muse Spark 1.3; Fable 5.1 still leads at 70.
  • ✓~2/3 fewer tokens vs GPT-5.6 Sol (max); multiple effort levels sit on the token-efficiency Pareto frontier.
  • ✓List price $10/$50 (90% cache-read discount); Intelligence Index 61; hallucination rate ~92%→~51%.
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