o1-pro

In one line

o1-pro by OpenAI, measured by Artificial Analysis at 12.4 on the Intelligence Index. Added to WhichAI automatically from live data on October 13, 2026: no editorial review yet, so judge it by the numbers, not by a verdict. OpenRouter's description: “The o1 series of models are trained with reinforcement learning to think before they answer and perform complex reasoning.”

Alternatives worth a look

• Mercury 2.5 (Inception Labs) · AA 12.3API $0.04/$0.15 per 1M tokens on OpenRouter · listed September 8, 2026
• Nemotron 3 Super (NVIDIA) · AA 12.8Open weights · its free OpenRouter route (nvidia/nemotron-3-super-120b-a12b:free) has been retired
• Qwen3 Coder (Alibaba) · AA 11.9Open weights · 1M context · its free OpenRouter route (qwen/qwen3-coder:free) has been retired; paid routes and self-hosting remain

Artificial Analysis Intelligence Index, official scale (the number published on artificialanalysis.ai), relayed by OpenRouter and refreshed automatically: last read October 13, 2026. 210 models carry a current official measurement. A value marked ~ is converted from an earlier snapshot because no current measurement is published; an unmeasured model is never ranked. Context, price, modality and listing dates come from the public OpenRouter model list (refreshed automatically on the live site; static copy retrieved October 3, 2026) and vendor pages. Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (the Ranking chapter and About > Methodology).