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Factuality · Oct 14, 2026
Who is SOTA in Factuality?
Gemini 4 Argon & Claude Opus 5.5 & Claude Fable 5.1

Short-form factual accuracy. SimpleQA Verified plus the LMArena factuality slice. 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…

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1GGemini 4 Argon
Google DeepMind		Co-SOTA · FactualitymediumGemini 4 Argon is tied for SOTA in Factuality with Claude Opus 5.5, Claude Fable 5.1, within the margin of error, since 2026-10-02.
1AClaude Opus 5.5
Anthropic		Co-SOTA · FactualitymediumClaude Opus 5.5 is tied for SOTA in Factuality with Gemini 4 Argon, Claude Fable 5.1, within the margin of error, since 2026-10-02.
1AClaude Fable 5.1
Anthropic		Co-SOTA · FactualitymediumClaude Fable 5.1 is tied for SOTA in Factuality with Gemini 4 Argon, Claude Opus 5.5, within the margin of error, since 2026-10-02.
3AClaude Opus 4.6
Anthropic		Near-SOTA · FactualitymediumClose in Factuality: rank #3, 3.0 percentile points behind the leader.
4AClaude Opus 5
Anthropic		Near-SOTA · FactualitymediumClose in Factuality: rank #4, 3.7 percentile points behind the leader.
1MMuse Wonder
Meta		Pending · FactualitylowToo new to call Factuality. A crown change still needs two confirming signals.
5OGPT-5.5
OpenAI		Was SOTA · FactualitymediumWas SOTA in Factuality from 2026-08-10 to 2026-08-21. Currently ranked #5.
6OGPT-5.4
OpenAI		Was SOTA · FactualitymediumWas SOTA in Factuality from 2026-08-10 to 2026-08-21. Currently ranked #6.
7AClaude Fable 5
Anthropic		Was SOTA · FactualitymediumWas SOTA in Factuality from 2026-08-10 to 2026-08-21. Currently ranked #7.
8XIMimo V2.6 Pro
xiaomi		#8 in FactualitymediumRanked #8 in Factuality.
9MMuse Spark 1.2
Meta		Was SOTA · FactualitymediumWas SOTA in Factuality from 2026-08-21 to 2026-10-02. Currently ranked #9.
10GGemini 3 Pro
Google DeepMind		Was SOTA · FactualitymediumWas SOTA in Factuality from 2026-07-14 to 2026-07-21. Currently ranked #10.
11MMuse Spark 1.3
Meta		#11 in FactualitymediumRanked #11 in Factuality.
12AClaude Opus 4.7
Anthropic		#12 in FactualitymediumRanked #12 in Factuality.
13GGemini 3.5 Flash
Google DeepMind		#13 in FactualitymediumRanked #13 in Factuality.
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Badges for the leaders

Gemini 4 Argon

CO-SOTA · Factuality · Oct 2026

[![CO-SOTA · Factuality · Oct 2026](https://isitsota.com/badge/gemini-4-argon/factuality.svg)](https://isitsota.com/m/gemini-4-argon)

<a href="https://isitsota.com/m/gemini-4-argon"><img alt="CO-SOTA · Factuality · Oct 2026" src="https://isitsota.com/badge/gemini-4-argon/factuality.svg" height="28"></a>

Claude Opus 5.5

CO-SOTA · Factuality · Oct 2026

[![CO-SOTA · Factuality · Oct 2026](https://isitsota.com/badge/claude-opus-5-5/factuality.svg)](https://isitsota.com/m/claude-opus-5-5)

<a href="https://isitsota.com/m/claude-opus-5-5"><img alt="CO-SOTA · Factuality · Oct 2026" src="https://isitsota.com/badge/claude-opus-5-5/factuality.svg" height="28"></a>

Claude Fable 5.1

CO-SOTA · Factuality · Oct 2026

[![CO-SOTA · Factuality · Oct 2026](https://isitsota.com/badge/claude-fable-5-1/factuality.svg)](https://isitsota.com/m/claude-fable-5-1)

<a href="https://isitsota.com/m/claude-fable-5-1"><img alt="CO-SOTA · Factuality · Oct 2026" src="https://isitsota.com/badge/claude-fable-5-1/factuality.svg" height="28"></a>

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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.