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

AA Intelligence: 32.5#45 of 151
Input / output per 1M: $1.75/ $14.00
Output speed: 120tok/s
Context window: 400K tokens

Composite indexes

Artificial Analysis Intelligence Index#45 of 151
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#26 of 89
86%independenttelecom (AA), xhighArtificial Analysis: GPT-5.3 Codex (xhigh) ↗
Leader: GLM-5.2 at 99.1%

Reasoning and knowledge

Humanity’s Last Exam#30 of 153
42.5%independentno tools (AA), xhighArtificial Analysis: GPT-5.3 Codex (xhigh) ↗
Leader: Claude Sonnet 5.5 at 64.5%
GPQA Diamond#28 of 144
91.5%independentAA, xhighArtificial Analysis: GPT-5.3 Codex (xhigh) ↗
Leader: GPT-6 Astra at 96.1%
CritPt#29 of 144
16.9%independentxhighArtificial Analysis: GPT-5.3 Codex (xhigh) ↗
Leader: Muse Wonder Full at 33%

Vision and long context

AA Long Context Reasoning#11 of 144
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) ↗