WhichAI / Models / GPT-5.3-Codex

GPT-5.3-Codex

· verified October 14, 2026

public paid api in Generator coding agents

Provider

Statuspublic

AA Intelligence Index32.5 (official, read October 14, 2026)

Released2026-02-24

Context window400K

Modalitiesn/a

API price $/1M (in / out)$1.75 / $14 (OpenRouter)

Speedn/a

AccessAPI · Codex tooling

In one line

Coding specialist built for agentic dev workflows rather than chat - punches far above its overall index score inside a code editor.

Coding85

Reasoning72

Writing55

Agents & tools84

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

Alternatives worth a look

Gemini 3.5 Flash (Google) · AA 33.6FREE (most generous free tier) · free API via Google AI Studio
Muse Spark 1.1 (Meta) · AA 33.7API via Meta Superintelligence Labs (Meta's first paid model, July 9, 2026)
GLM-5.2 (Z.ai) · AA 33.7Open weights · low-cost API hosts

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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).