WhichAI / Models / o3

o3

· verified October 14, 2026

legacy paid api reasoning

Provider

Statuslegacy

AA Intelligence Index20.2 (official, read October 14, 2026)

Released2025-04-16

Context window200K

Modalitiesn/a

API price $/1M (in / out)$2 / $8 (OpenRouter)

Speedn/a

AccessAPI (legacy)

In one line

Once the reasoning benchmark-setter; today mainly of historical and compatibility interest.

Coding55

Reasoning62

Writing42

Agents & tools48

Category scores (0-100) are WhichAI blended ratings: public category leaderboards plus editorial judgment. Guidance, not official measurements.

Alternatives worth a look

Ling 3.0 Flash (Ant Group) · AA 20.1API $0.021/$0.063 per 1M tokens on OpenRouter · open weights · listed July 23, 2026
GPT-5.1-Codex-Mini (OpenAI) · AA 20.4API $0.25/$2 per 1M tokens on OpenRouter · listed November 13, 2025
GPT-5.4 nano (OpenAI) · AA 20.7API (cheapest OpenAI tier)

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Artificial Analysis Intelligence Index, official scale (the number published on artificialanalysis.ai), relayed by OpenRouter and refreshed automatically: last read October 14, 2026. 209 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).