GPT-6 Luna (Xhigh) vs Granite 4.2 8B

Which is better for the money: GPT-6 Luna (Xhigh) by OpenAI or Granite 4.2 8B by IBM? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.

Trade-off

OpenAIGPT-6 Luna (Xhigh)On the frontier

Intelligence: 34.60
Total cost: $66.8

IBMGranite 4.2 8BOff the frontier

Intelligence: 11.10
Total cost: $53.1

Verdict

Depends on your budget

GPT-6 Luna (Xhigh) scores 23.5 points higher (34.6 vs 11.1) but costs 1.3× as much to run the benchmark ($66.8 vs $53.1; both mid-range class). Pick GPT-6 Luna (Xhigh) when the extra intelligence is worth the premium, otherwise Granite 4.2 8B.

Metric	GPT-6 Luna (Xhigh)	Granite 4.2 8B	Difference
Intelligence (higher is better)	34.6	11.1	−67.9% Granite 4.2 8B is 67.9% less intelligent
Total AA cost (lower is better)	$66.81	$53.07	−20.6% Granite 4.2 8B is 20.6% cheaper
End-to-end time (lower is better)	21.27s	39.25s	+84.5% Granite 4.2 8B is 84.5% slower
Price per 1M tokens (in / out)	$0.10 / $0.50	$0.06 / $0.25
Input modalities	Text, Image	Text

Granite 4.2 8B vs GPT-6 Luna (Xhigh): 67.9% less intelligence, 20.6% less cost to run the AA benchmark, and 84.5% slower end-to-end.

Open this matchup in the interactive picker GPT-6 Luna (Xhigh): what beats it Granite 4.2 8B: what beats it

Today's Pareto frontier

Against the frontier

GPT-6 Luna (Xhigh) is on today's frontier: nothing is both smarter and cheaper.
Granite 4.2 8B is off the frontier: at the same or lower cost, GPT-6 Luna (High) scores 32.90 for $47.9.

GPT-6 Luna (Xhigh)Granite 4.2 8BToday's Pareto frontierOpen-weights frontierEvery other model

Matchup

Compare something else

Agents: Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-6-luna-xhigh/granite-4-2-8b · Markdown: /api/v1/compare/gpt-6-luna-xhigh/granite-4-2-8b?format=md · llms.txt · agent skill