Best · Best AI model for factuality — October 2026

Best AI model for factuality — October 2026

As of Oct 14, 2026, Gemini 4 Argon & Claude Opus 5.5 & Claude Fable 5.1 are tied for state of the art in Factuality (since Oct 2, 2026; sources LMArena Text factuality; methodology v1.0).

Leading, crown pending confirmation: Muse Wonder.

Category board for Factuality

Top 10

Ranks

  1. #1 Gemini 4 Argon
  2. #1 Claude Opus 5.5
  3. #1 Claude Fable 5.1
  4. #3 Claude Opus 4.6
  5. #4 Claude Opus 5
  6. #1 Muse Wonder
  7. #5 GPT-5.5
  8. #6 GPT-5.4
  9. #7 Claude Fable 5
  10. #8 Mimo V2.6 Pro
Recent crowns

Last crown changes

  • Oct 2, 2026 — Factuality: Gemini 4 Argon and Claude Opus 5.5 and Claude Fable 5.1 are co-SOTA
  • Aug 21, 2026 — Factuality: Claude Opus 4.6 and Claude Opus 5 and Gemini 3.7 Flash and Muse Spark 1.2 are co-SOTA
  • Aug 10, 2026 — Factuality: Claude Opus 5 and Claude Opus 4.6 and GPT-5.5 and GPT-5.4 and Muse Spark 1.2 and Claude Fable 5 are co-SOTA
Weights

Which benchmarks count

Who is SOTA in Factuality?

As of Oct 14, 2026, Gemini 4 Argon & Claude Opus 5.5 & Claude Fable 5.1 are tied for state of the art in Factuality (since Oct 2, 2026; sources LMArena Text factuality; methodology v1.0).

Since when is the Factuality crown current?

The current crown in Factuality has held since Oct 2, 2026.