GPT-5 Nano

In one line

GPT-5 Nano by OpenAI, measured by Artificial Analysis at 13 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: “GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments.”

Alternatives worth a look

• Nemotron 3.5 Lightning (NVIDIA) · AA 12.9API $0.07/$0.2 per 1M tokens on OpenRouter · free route on OpenRouter (nvidia/nemotron-3.5-lightning:free) · open weights · listed August 11, 2026
• Nemotron 3 Super (NVIDIA) · AA 12.8Open weights · its free OpenRouter route (nvidia/nemotron-3-super-120b-a12b:free) has been retired
• Qwen3.5-9B (Alibaba) · AA 13.3API $0.1/$0.15 per 1M tokens on OpenRouter · open weights · listed March 10, 2026

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).