Model Comparator

Compare up to four models using the same criteria.

Grok 4.1 Fast (Reasoning)
SpaceXSI
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	Grok 4.1 Fast (Reasoning) SpaceXSI	GPT-5.1 Codex mini (High) OpenAI
Intelligence	20.4	20.4
Math	89.3	Best: 91.7
Speed	—	173 t/s
TTFT	—	15.8 s
Input · $ / 1M tokens	—	$0.25
Output · $ / 1M tokens	—	$2
Context window	Best: 2M	400K
Reasoning	Yes	Yes
Open weights	No	No

Intelligence

Grok 4.1 Fast (Reasoning): 20.4
GPT-5.1 Codex mini (High): 20.4

Math

Grok 4.1 Fast (Reasoning): 89.3
GPT-5.1 Codex mini (High): Best: 91.7

Speed

Grok 4.1 Fast (Reasoning): —
GPT-5.1 Codex mini (High): 173 t/s

TTFT

Grok 4.1 Fast (Reasoning): —
GPT-5.1 Codex mini (High): 15.8 s

Input · $ / 1M tokens

Grok 4.1 Fast (Reasoning): —
GPT-5.1 Codex mini (High): $0.25

Output · $ / 1M tokens

Grok 4.1 Fast (Reasoning): —
GPT-5.1 Codex mini (High): $2

Context window

Grok 4.1 Fast (Reasoning): Best: 2M
GPT-5.1 Codex mini (High): 400K

Reasoning

Grok 4.1 Fast (Reasoning): Yes
GPT-5.1 Codex mini (High): Yes

Open weights

Grok 4.1 Fast (Reasoning): No
GPT-5.1 Codex mini (High): No

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-5.1 Codex mini (High)20.4 · $0.688

Not plotted for lack of data on these axes: Grok 4.1 Fast (Reasoning).