Top 10 Frontier AI Models Ranked (2026)

Fable 5.2 leads Intelligence Index v5 at 64.6 and 79% accuracy, while Gemini 4 Carbon costs 4x less per token and tops Arena Text. Fable 5.2 leads Intelligence Index v5 at 64.6 and 79% accuracy, while Gemini 4 Carbon costs 4x less per…

token and tops Arena Text. Overall Intelligence & Reasoning #1: Claude Fable 5.2 (93.9 BenchAlign v5.8 / 64.6 Intelligence Index v5). Agentic Coding & WebDev #1: Claude Opus 5.5 (1818 Arena WebDev / 65.8% Terminal-Bench 4.1). Open-Weight Leader #1: Kimi K3.1 Pro (70.4 BenchAlign v5.8 / 67.2% Terminal-Bench 4.0). Fable 5.2 leads Intelligence Index v5 at 64.6 and 79% accuracy, while Gemini 4 Carbon costs 4x less per token and tops Arena Text. Overall Intelligence & Reasoning #1: Claude Fable 5.2 (93.9 BenchAlign v5.8 / 64.6 Intelligence Index v5). Agentic Coding & WebDev #1: Claude Opus 5.5 (1818 Arena WebDev / 65.8% Terminal-Bench 4.1). Open-Weight Leader #1: Kimi K3.1 Pro (70.4 BenchAlign v5.8 / 67.2% Terminal-Bench 4.0). Evaluated across Intelligence Index v5, BenchAlign v5.8, ARC-AGI-3, FrontierCode 2.0, LiveBench 2.0, token pricing, and context window capacity as of November 2026.

#1 Top RankedLeader
#1
Claude Fable 5.2
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Released Nov 9, 2026, Claude Fable 5.2 holds #1 on BenchAlign v5.8 (93.9), Intelligence Index v5 (64.6 at max effort), AA-Omniscience accuracy (79%), Humanity's Last Exam (74.3%), ARC-AGI-3 (81.2%), FrontierCode 2.0 (49.1%), and LiveBench 2.0 (84.9). It beats #2 Gemini 4 Carbon by 4.6 points on Intelligence Index v5, though Carbon costs 4x less per token at $2/$10.
Why it ranks #1: Released Nov 9, 2026, Claude Fable 5.2 holds #1 on BenchAlign v5.8 (93.9), Intelligence Index v5 (64.6 at max effort), AA-Omniscience accuracy (79%), Humanity's Last Exam (74.3%), ARC-AGI-3 (81.2%), FrontierCode 2.0 (49.1%), and LiveBench 2.0 (84.9).
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#2
Gemini 4 Carbon
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GA since Nov 10, 2026, Gemini 4 Carbon ranks #1 in Arena Text (1526), Mercor APEX-Agents (84.2%), and LiveBench 2.0 Coding (91.0), plus #2 on Terminal-Bench 4.0 (65.2%). It trails #1 Claude Fable 5.2 by 4.7 BenchAlign points, yet edges #3 Claude Opus 5.5 by 0.9 points on Intelligence Index v5 while matching half of Opus 5.5's standard $4/$20 API rate through Nov 30.
Why it ranks #2: GA since Nov 10, 2026, Gemini 4 Carbon ranks #1 in Arena Text (1526), Mercor APEX-Agents (84.2%), and LiveBench 2.0 Coding (91.0), plus #2 on Terminal-Bench 4.0 (65.2%).
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#3
Claude Opus 5.5
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Launched Sept 22, 2026, Claude Opus 5.5 leads Arena WebDev (1818), image-to-WebDev (1750), Terminal-Bench 4.1 (65.8%), Mercor APEX-SWE (67.6%), and GDPval-AA v2.1 (1866), alongside #2 on Humanity's Last Exam (61.4%). It sits 2.6 BenchAlign points behind #2 Gemini 4 Carbon, but outscores #4 GPT-6 Astra by 2.2 points on Intelligence Index v5 at less than half Astra's $10/$50 price.
Why it ranks #3: Launched Sept 22, 2026, Claude Opus 5.5 leads Arena WebDev (1818), image-to-WebDev (1750), Terminal-Bench 4.1 (65.8%), Mercor APEX-SWE (67.6%), and GDPval-AA v2.1 (1866), alongside #2 on Humanity's Last Exam (61.4%).
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#4
GPT-6 Astra
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OpenAI's Sept 3, 2026 flagship tops ARC-AGI-2 at 95% and ranks #2 on both LiveBench 2.0 Reasoning (92.7) and ARC-AGI-3 (62.7%), plus #4 on Arena WebDev (1767). It trails #3 Claude Opus 5.5 by 2.2 points on Intelligence Index v5 and costs $10/$50 per 1M tokens, yet leads sibling #5 GPT-6.1 Sol by 2.3 points on Intelligence Index v5.
Why it ranks #4: OpenAI's Sept 3, 2026 flagship tops ARC-AGI-2 at 95% and ranks #2 on both LiveBench 2.0 Reasoning (92.7) and ARC-AGI-3 (62.7%), plus #4 on Arena WebDev (1767).
Also appears in:#1Top 10 Hacker News — Top Stories — September 4, 2026 All 2 rankings→
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#5
GPT-6.1 Sol
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Released Sept 29, 2026, GPT-6.1 Sol hits 54.6 on Intelligence Index v5 at $1.27 per task—the lowest cost among models above 50—with #2 on ARC-AGI-2 (94.2%), #3 on LiveBench 2.0 Reasoning (92.6), and 60.9% on Terminal-Bench 4.1. It lags #4 GPT-6 Astra by 1.1 BenchAlign points at 5x lower token pricing, and tops #6 Claude Sonnet 5.5 by 1.5 BenchAlign points.
Why it ranks #5: Released Sept 29, 2026, GPT-6.1 Sol hits 54.6 on Intelligence Index v5 at $1.27 per task—the lowest cost among models above 50—with #2 on ARC-AGI-2 (94.2%), #3 on LiveBench 2.0 Reasoning (92.6), and 60.9% on Terminal-Bench 4.1.
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#6
Claude Sonnet 5.5
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Available free on claude.ai, Claude Sonnet 5.5 places #2 on Arena WebDev (1774), Terminal-Bench 4.1 (63.9%), and Mercor APEX-SWE (66.4%), plus #4 on GDPval-AA v2.1 (1838). It trails #5 GPT-6.1 Sol by 0.4 Intelligence Index points overall, but leads #7 Gemini 4 Argon by 4.0 BenchAlign points and 3.8 Intelligence Index points.
Why it ranks #6: Available free on claude.ai, Claude Sonnet 5.5 places #2 on Arena WebDev (1774), Terminal-Bench 4.1 (63.9%), and Mercor APEX-SWE (66.4%), plus #4 on GDPval-AA v2.1 (1838).
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#7
Gemini 4 Argon
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GA since Oct 13, 2026 on AI Pro and API, Gemini 4 Argon leads Arena Creative Writing (1525) and LiveBench 2.0 Reasoning (95.1), ranks #2 in Arena Text (1522) and Mercor APEX-Agents (82.4%), and posts a 4% AA-Omniscience hallucination rate. While 3.8 Intelligence Index points behind #6 Claude Sonnet 5.5, it beats #8 GPT-6.1 Terra on Arena preference and reasoning.
Why it ranks #7: GA since Oct 13, 2026 on AI Pro and API, Gemini 4 Argon leads Arena Creative Writing (1525) and LiveBench 2.0 Reasoning (95.1), ranks #2 in Arena Text (1522) and Mercor APEX-Agents (82.4%), and posts a 4% AA-Omniscience hallucination rate.
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#8
GPT-6.1 Terra
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Launched Oct 26, 2026, GPT-6.1 Terra scores 51.3 on Intelligence Index v5 at $0.96 per task and $1/$5 per 1M tokens, with #3 on LiveBench 2.0 Coding (89.2), #4 on FrontierCode 2.0 (42.3%), and 55.6% on Terminal-Bench 4.0. It trails #7 Gemini 4 Argon on Arena preference and hallucination rate, but beats #9 Muse Wonder Full by 7.0 BenchAlign points.
Why it ranks #8: Launched Oct 26, 2026, GPT-6.1 Terra scores 51.3 on Intelligence Index v5 at $0.96 per task and $1/$5 per 1M tokens, with #3 on LiveBench 2.0 Coding (89.2), #4 on FrontierCode 2.0 (42.3%), and 55.6% on Terminal-Bench 4.0.
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#9
Muse Wonder Full
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Released Oct 12, 2026 inside Muse Code, Meta's Muse Wonder Full reaches #3 on GDPval-AA v2.1 (1857), 57.1% on Terminal-Bench 4.0, and #7 on Arena WebDev (1724) with a 50.1 Intelligence Index v5 score. It sits 1.2 Intelligence Index points behind #8 GPT-6.1 Terra and 7.0 BenchAlign points back, while beating #10 Kimi K3.1 Pro by 3.6 Intelligence Index points.
Why it ranks #9: Released Oct 12, 2026 inside Muse Code, Meta's Muse Wonder Full reaches #3 on GDPval-AA v2.1 (1857), 57.1% on Terminal-Bench 4.0, and #7 on Arena WebDev (1724) with a 50.1 Intelligence Index v5 score.
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#10
Kimi K3.1 Pro
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With open weights published Nov 2, 2026, Moonshot AI's 2.8T-total / 104B-active parameter Kimi K3.1 Pro leads all open-weight models by 13.9 Intelligence Index points over DeepSeek V4.1-Flash-1017, hits #1 overall on AA's Terminal-Bench 4.0 run (67.2%), #2 on GDPval-AA v2.1 (1861), and #2 on EQ-Bench Creative Writing (2172.6). It trails #9 Muse Wonder Full by 3.6 Intelligence Index points.
Why it ranks #10: With open weights published Nov 2, 2026, Moonshot AI's 2.8T-total / 104B-active parameter Kimi K3.1 Pro leads all open-weight models by 13.9 Intelligence Index points over DeepSeek V4.1-Flash-1017, hits #1 overall on AA's Terminal-Bench 4.0 run (67.2%), #2 on GDPval-AA v2.1 (1861), and #2 on EQ-Bench Creative Writing (2172.6).
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