Kimi K2 Thinking vs GPT-6 Astra vs Gemini 4 Argon vs Claude Fable 5.1

Head to head on 16 boards: GPT-6 Astra places best on 6, Gemini 4 Argon places best on 6, Claude Fable 5.1 places best on 4 and Kimi K2 Thinking places best on 0. All 4 ranked on 1 of 19 boards.

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Kimi K2 ThinkingGPT-6 AstraGemini 4 ArgonClaude Fable 5.1

Board	Read	Kimi K2 Thinking	GPT-6 Astra	Gemini 4 Argon	Claude Fable 5.1
Chat2
Text ArenaArena ratingtodaytoday	Nov 9todaytoday		#311,475	#21,523best of the picked	#61,504
MultiChallengeScoretodaytoday	Nov 9todaytoday	#2455.4%		#278.7%best of the picked
Reasoning7
Epoch ECIECItodaytoday	Nov 9todaytoday	#85145.5	#1169.1best of the picked	#6166.4	#5166.9
ARC-AGI-2Scoretodaytoday	Nov 9todaytoday		#195.0%best of the picked	#591.3%	#790.0%
AA IntelligenceIndextodaytoday	Nov 9todaytoday		#356.9best of the picked	#750.4	#950.0
HLEAccuracytodaytoday	Nov 9todaytoday		#154.8%best of the picked		#246.5%
GPQA DiamondAccuracytodaytoday	Nov 9todaytoday		#295.8%	#196.4%best of the picked
LiveBenchGlobal averagetodaytoday	Nov 9todaytoday		#482.2%		#183.4%best of the picked
MMLU-ProAccuracy · staletodaytoday	Nov 9todaytoday	#5681.0%
Coding4
SWE-Bench ProResolvedtodaytoday	Nov 9todaytoday		#490.2%	#392.2%	#292.2%best of the picked
WebDev ArenaArena ratingtodaytoday	Nov 9todaytoday		#31,770best of the picked	#101,683	#51,746
SWE-bench VerifiedResolved · staletodaytoday	Nov 9todaytoday	#1863.4%
Aider PolyglotPass rate · staletodaytoday	Nov 9todaytoday	#1959.1%
Agents and tools2
MCP AtlasPass ratetodaytoday	Nov 9todaytoday			#190.7%best of the picked	#387.2%
Search ArenaArena ratingtodaytoday	Nov 9todaytoday		#31,245best of the picked		#71,227
Vision2
Document ArenaArena ratingtodaytoday	Nov 9todaytoday		#111,477		#21,499best of the picked
Vision ArenaArena ratingtodaytoday	Nov 9todaytoday		#171,285		#131,288best of the picked
Speed1
AA SpeedOutput speedtodaytoday	Nov 9todaytoday		#1621 tok/s	#1028 tok/sbest of the picked	#1422 tok/s
Price1
AA PriceBlended pricetodaytoday	Nov 9todaytoday		#17$20.0	#13$8.00best of the picked	#17$20.0

Green marks the best placing among the picked where two or more are ranked; ties are marked for each. Ranks are each board's own order (lower is better), scores as the board published them. Dash: not on that board.