Model Comparator

Compare up to four models using the same criteria.

Grok 4.20 0309 v2 (Reasoning)
SpaceXSI
GPT-5.5 Instant (June 2026)
OpenAI

Differences only

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

Model Comparator
Metrics	Grok 4.20 0309 v2 (Reasoning) SpaceXSI	GPT-5.5 Instant (June 2026) OpenAI
Intelligence	25.7	Best: 26
Coding	—	39.4
Agentic	—	16.6
Speed	101 t/s	Best: 151 t/s
TTFT	17.3 s	Best: 0.88 s
Input · $ / 1M tokens	Best: $1.25	$5×4 relative to the lowest price among the compared models
Output · $ / 1M tokens	Best: $2.50	$30×12 relative to the lowest price among the compared models
Context window	Best: 2M	400K
Reasoning	Yes	Yes
Open weights	No	No
Cost / task	—	$0.692

Intelligence

Grok 4.20 0309 v2 (Reasoning): 25.7
GPT-5.5 Instant (June 2026): Best: 26

Coding

Grok 4.20 0309 v2 (Reasoning): —
GPT-5.5 Instant (June 2026): 39.4

Agentic

Grok 4.20 0309 v2 (Reasoning): —
GPT-5.5 Instant (June 2026): 16.6

Speed

Grok 4.20 0309 v2 (Reasoning): 101 t/s
GPT-5.5 Instant (June 2026): Best: 151 t/s

TTFT

Grok 4.20 0309 v2 (Reasoning): 17.3 s
GPT-5.5 Instant (June 2026): Best: 0.88 s

Input · $ / 1M tokens

Grok 4.20 0309 v2 (Reasoning): Best: $1.25
GPT-5.5 Instant (June 2026): $5×4 relative to the lowest price among the compared models

Output · $ / 1M tokens

Grok 4.20 0309 v2 (Reasoning): Best: $2.50
GPT-5.5 Instant (June 2026): $30×12 relative to the lowest price among the compared models

Context window

Grok 4.20 0309 v2 (Reasoning): Best: 2M
GPT-5.5 Instant (June 2026): 400K

Reasoning

Grok 4.20 0309 v2 (Reasoning): Yes
GPT-5.5 Instant (June 2026): Yes

Open weights

Grok 4.20 0309 v2 (Reasoning): No
GPT-5.5 Instant (June 2026): No

Cost / task

Grok 4.20 0309 v2 (Reasoning): —
GPT-5.5 Instant (June 2026): $0.692

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.

Grok 4.20 0309 v2 (Reasoning)25.7 · $1.56
GPT-5.5 Instant (June 2026)26 · $11.25