Model Comparator

Compare up to four models using the same criteria.

GPT-5.6 Terra (Xhigh)
OpenAI
Grok 4.5 (High)
SpaceXSI

Differences only

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

Model Comparator
Metrics	GPT-5.6 Terra (Xhigh) OpenAI	Grok 4.5 (High) SpaceXSI
Intelligence	38	Best: 38.8
Coding	70.6	Best: 72.4
Agentic	Best: 41.4	41.2
Speed	Best: 110 t/s	53.5 t/s
TTFT	38.9 s	Best: 12.1 s
Input · $ / 1M tokens	$2	$2
Output · $ / 1M tokens	$12×2 relative to the lowest price among the compared models	Best: $6
Context window	1M	1M
Reasoning	Yes	Yes
Open weights	No	No
Cost / task	Best: $0.632	$0.76×1.2 relative to the lowest price among the compared models

Intelligence

GPT-5.6 Terra (Xhigh): 38
Grok 4.5 (High): Best: 38.8

Coding

GPT-5.6 Terra (Xhigh): 70.6
Grok 4.5 (High): Best: 72.4

Agentic

GPT-5.6 Terra (Xhigh): Best: 41.4
Grok 4.5 (High): 41.2

Speed

GPT-5.6 Terra (Xhigh): Best: 110 t/s
Grok 4.5 (High): 53.5 t/s

TTFT

GPT-5.6 Terra (Xhigh): 38.9 s
Grok 4.5 (High): Best: 12.1 s

Input · $ / 1M tokens

GPT-5.6 Terra (Xhigh): $2
Grok 4.5 (High): $2

Output · $ / 1M tokens

GPT-5.6 Terra (Xhigh): $12×2 relative to the lowest price among the compared models
Grok 4.5 (High): Best: $6

Context window

GPT-5.6 Terra (Xhigh): 1M
Grok 4.5 (High): 1M

Reasoning

GPT-5.6 Terra (Xhigh): Yes
Grok 4.5 (High): Yes

Open weights

GPT-5.6 Terra (Xhigh): No
Grok 4.5 (High): No

Cost / task

GPT-5.6 Terra (Xhigh): Best: $0.632
Grok 4.5 (High): $0.76×1.2 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 Terra (Xhigh)38 · $0.632
Grok 4.5 (High)38.8 · $0.76