Model Comparator

Compare up to four models using the same criteria.

GPT-5.4 nano (Xhigh)
OpenAI
GPT-5.1 Codex mini (High)
OpenAI

Differences only

✓ Best published value among measured models. — Data unavailable. These metrics do not establish an overall ranking.

Model Comparator
Metrics	GPT-5.4 nano (Xhigh) OpenAI	GPT-5.1 Codex mini (High) OpenAI
Intelligence	Best: 20.7	20.4
Coding	56.1	—
Math	—	91.7
Agentic	16	—
Speed	166 t/s	Best: 175 t/s
TTFT	81 s	Best: 18.8 s
Input · $ / 1M tokens	Best: $0.20	$0.25×1.3 relative to the lowest price among the compared models
Output · $ / 1M tokens	Best: $1.25	$2×1.6 relative to the lowest price among the compared models
Context window	400K	400K
Reasoning	Yes	Yes
Open weights	No	No
Cost / task	$0.183	—

Intelligence

GPT-5.4 nano (Xhigh): Best: 20.7
GPT-5.1 Codex mini (High): 20.4

Coding

GPT-5.4 nano (Xhigh): 56.1
GPT-5.1 Codex mini (High): —

Math

GPT-5.4 nano (Xhigh): —
GPT-5.1 Codex mini (High): 91.7

Agentic

GPT-5.4 nano (Xhigh): 16
GPT-5.1 Codex mini (High): —

Speed

GPT-5.4 nano (Xhigh): 166 t/s
GPT-5.1 Codex mini (High): Best: 175 t/s

TTFT

GPT-5.4 nano (Xhigh): 81 s
GPT-5.1 Codex mini (High): Best: 18.8 s

Input · $ / 1M tokens

GPT-5.4 nano (Xhigh): Best: $0.20
GPT-5.1 Codex mini (High): $0.25×1.3 relative to the lowest price among the compared models

Output · $ / 1M tokens

GPT-5.4 nano (Xhigh): Best: $1.25
GPT-5.1 Codex mini (High): $2×1.6 relative to the lowest price among the compared models

Context window

GPT-5.4 nano (Xhigh): 400K
GPT-5.1 Codex mini (High): 400K

Reasoning

GPT-5.4 nano (Xhigh): Yes
GPT-5.1 Codex mini (High): Yes

Open weights

GPT-5.4 nano (Xhigh): No
GPT-5.1 Codex mini (High): No

Cost / task

GPT-5.4 nano (Xhigh): $0.183
GPT-5.1 Codex mini (High): —

Each reasoning level remains a separate configuration.

Score and cost

Each line joins the reasoning levels of a compared model; the large point marks the configuration in the table. The top-right corner holds the best score for the lowest cost. Select another point to compare that level.

GPT-5.4 nano (Xhigh)20.7 · $0.463
GPT-5.1 Codex mini (High)20.4 · $0.688