Anthropic’s September 2026 release of Claude Fable 5.1 and Mythos 5.1 has driven the current leader position on Humanity’s Last Exam, with reported scores reaching 65% and 64.5% respectively under tool-augmented or reasoning-optimized conditions. These iterative upgrades build on earlier 2026 launches including Opus 5 and Fable 5, emphasizing enhanced reasoning, tool use, and adaptive thinking across the 2,500 expert-level questions spanning math, sciences, and humanities. Claude variants now occupy the top leaderboard spots ahead of OpenAI and Google models, reflecting Anthropic’s focused scaling of large language model capabilities. With the year-end resolution still months away, additional model refinements or new releases could further elevate the highest Claude score before December 31.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated$88,043 Vol.
55%+
90%
60%+
57%
65%+
28%
70%+
7%
75%+
6%
$88,043 Vol.
55%+
90%
60%+
57%
65%+
28%
70%+
7%
75%+
6%
For resolution, “accuracy” refers solely to the value labeled “HLE Accuracy” or a clear equivalent metric if the data’s presentation or terminology is restructured, regardless of the model’s Calibration Error or any other displayed metric.
The resolution source will be the official Humanity’s Last Exam leaderboard at https://agi.safe.ai/. If the resolution source becomes unavailable during the listed timeframe, this market will remain open to allow the relevant data to become available again. If the source remains unavailable after the end of the listed timeframe or is otherwise confirmed to be permanently unavailable, official Humanity’s Last Exam results published elsewhere may be used. If no official alternative source is available, this market will resolve to "No".
Market Opened: Jul 23, 2026, 6:42 PM ET
Resolution Source
https://agi.safe.ai/Resolver
0x65070BE91...For resolution, “accuracy” refers solely to the value labeled “HLE Accuracy” or a clear equivalent metric if the data’s presentation or terminology is restructured, regardless of the model’s Calibration Error or any other displayed metric.
The resolution source will be the official Humanity’s Last Exam leaderboard at https://agi.safe.ai/. If the resolution source becomes unavailable during the listed timeframe, this market will remain open to allow the relevant data to become available again. If the source remains unavailable after the end of the listed timeframe or is otherwise confirmed to be permanently unavailable, official Humanity’s Last Exam results published elsewhere may be used. If no official alternative source is available, this market will resolve to "No".
Resolution Source
https://agi.safe.ai/Resolver
0x65070BE91...Anthropic’s September 2026 release of Claude Fable 5.1 and Mythos 5.1 has driven the current leader position on Humanity’s Last Exam, with reported scores reaching 65% and 64.5% respectively under tool-augmented or reasoning-optimized conditions. These iterative upgrades build on earlier 2026 launches including Opus 5 and Fable 5, emphasizing enhanced reasoning, tool use, and adaptive thinking across the 2,500 expert-level questions spanning math, sciences, and humanities. Claude variants now occupy the top leaderboard spots ahead of OpenAI and Google models, reflecting Anthropic’s focused scaling of large language model capabilities. With the year-end resolution still months away, additional model refinements or new releases could further elevate the highest Claude score before December 31.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated



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