Gemini 4 Carbon tops MathArena's maths ranking, ahead of Claude Fable 5.2 and GPT-6.1 Sol

Nov 14, 2026
The independent benchmark ranks Google's model first at 85.4%, but the three leaders' error ranges overlap and Carbon costs about 15 times as much per run as OpenAI's model.

Google's Gemini 4 Carbon now ranks first overall on MathArena, the independent benchmark that tests AI models on new maths competition problems, with a score of 85.4% (plus or minus 3.0 points). Anthropic's Claude Fable 5.2 is second at 82.8% (plus or minus 5.3) and OpenAI's GPT-6.1 Sol third at 80.6% (plus or minus 2.7), according to the MathArena leaderboard.

MathArena added Fable 5.2 and Carbon on November 13, and Carbon is the first non-OpenAI model in a while to take the top spot, Tbreak reports, citing The Decoder. The three scores' ranges overlap, so the ranking is closer than the order suggests.

The models differ sharply in cost. MathArena lists an average cost per run of $15.70 for Carbon, $40.20 for Fable 5.2 and $1.07 for GPT-6.1 Sol, each at the high or maximum reasoning setting used in testing. According to The Decoder, Carbon's most common failure is exceeding the time limit, and it almost never gives up; in one run it ran a script for more than eleven hours without checking progress. Google made Carbon available through its API on November 10.

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