GPT-5.3 Codex benchmarks, price, and specs | Tokens or Towers

AA Intelligence: 32.5#37 of 142
Input / output per 1M: $1.75/ $14.00
Output speed: 120tok/s
Context window: 400K tokens

Composite indexes

Artificial Analysis Intelligence Index#37 of 142
33independentAA Intelligence Index v4.3.2, xhighArtificial Analysis: GPT-5.3 Codex (xhigh) ↗
Leader: Claude Opus 5.5 at 58

Agents and tool use

τ²-Bench#25 of 88
86%independenttelecom (AA), xhighArtificial Analysis: GPT-5.3 Codex (xhigh) ↗
Leader: GLM-5.2 at 99.1%

Reasoning and knowledge

Humanity’s Last Exam#27 of 147
42.5%independentno tools (AA), xhighArtificial Analysis: GPT-5.3 Codex (xhigh) ↗
Leader: Claude Opus 5.5 at 61.4%
GPQA Diamond#28 of 142
91.5%independentAA, xhighArtificial Analysis: GPT-5.3 Codex (xhigh) ↗
Leader: GPT-6 Astra at 96.1%
CritPt#26 of 139
16.9%independentxhighArtificial Analysis: GPT-5.3 Codex (xhigh) ↗
Leader: GPT-5.6 Sol at 32.3%

Vision and long context

AA Long Context Reasoning#11 of 139
83.3%independentxhighArtificial Analysis: GPT-5.3 Codex (xhigh) ↗
Leader: Kimi K3 at 88.7%
MMMU-Pro#25 of 72
78.5%independentAA, xhighArtificial Analysis: GPT-5.3 Codex (xhigh) ↗
Leader: Claude Opus 5.5 at 87.7%

Other published results

Result	Score	Reported by	Source
AA-Omniscience Index · xhigh	10.9 index (-100 to 100)	independent	Artificial Analysis: GPT-5.3 Codex (xhigh) ↗