Model Comparator

Compare up to four models using the same criteria.

GPT-5.6 Luna (Low)
OpenAI
GPT-5.4 nano (Xhigh)
OpenAI

Differences only

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

Model Comparator
Metrics	GPT-5.6 Luna (Low) OpenAI	GPT-5.4 nano (Xhigh) OpenAI
Intelligence	Best: 21	20.7
Coding	44.2	Best: 56.1
Agentic	Best: 16.1	16
Speed	120 t/s	Best: 166 t/s
TTFT	Best: 1.47 s	81 s
Input · $ / 1M tokens	$0.20	$0.20
Output · $ / 1M tokens	Best: $1.20	$1.25
Context window	Best: 1M	400K
Reasoning	Yes	Yes
Open weights	No	No
Cost / task	Best: $0.0098	$0.183×18.7 relative to the lowest price among the compared models

Intelligence

GPT-5.6 Luna (Low): Best: 21
GPT-5.4 nano (Xhigh): 20.7

Coding

GPT-5.6 Luna (Low): 44.2
GPT-5.4 nano (Xhigh): Best: 56.1

Agentic

GPT-5.6 Luna (Low): Best: 16.1
GPT-5.4 nano (Xhigh): 16

Speed

GPT-5.6 Luna (Low): 120 t/s
GPT-5.4 nano (Xhigh): Best: 166 t/s

TTFT

GPT-5.6 Luna (Low): Best: 1.47 s
GPT-5.4 nano (Xhigh): 81 s

Input · $ / 1M tokens

GPT-5.6 Luna (Low): $0.20
GPT-5.4 nano (Xhigh): $0.20

Output · $ / 1M tokens

GPT-5.6 Luna (Low): Best: $1.20
GPT-5.4 nano (Xhigh): $1.25

Context window

GPT-5.6 Luna (Low): Best: 1M
GPT-5.4 nano (Xhigh): 400K

Reasoning

GPT-5.6 Luna (Low): Yes
GPT-5.4 nano (Xhigh): Yes

Open weights

GPT-5.6 Luna (Low): No
GPT-5.4 nano (Xhigh): No

Cost / task

GPT-5.6 Luna (Low): Best: $0.0098
GPT-5.4 nano (Xhigh): $0.183×18.7 relative to the lowest price among the compared models

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-5.6 Luna (Low)21 · $0.0098
GPT-5.4 nano (Xhigh)20.7 · $0.183