GPT-6 Luna (Low) vs Granite 4.2 3B

Which is better for the money: GPT-6 Luna (Low) by OpenAI or Granite 4.2 3B by IBM? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.

Clear winner

OpenAIGPT-6 Luna (Low)On the frontier

Intelligence: 21.50
Total cost: $10.6

IBMGranite 4.2 3BOn the open-weights frontier

Intelligence: 9.10
Total cost: $14.9

Verdict

Pick GPT-6 Luna (Low)

Granite 4.2 3B vs GPT-6 Luna (Low): 57.7% less intelligence, 40.3% more cost to run the AA benchmark, and 434.8% slower end-to-end.

Metric	GPT-6 Luna (Low)	Granite 4.2 3B	Difference
Intelligence (higher is better)	21.5	9.1	−57.7% Granite 4.2 3B is 57.7% less intelligent
Total AA cost (lower is better)	$10.63	$14.91	+40.3% Granite 4.2 3B is 40.3% more expensive
End-to-end time (lower is better)	6.60s	35.30s	+434.8% Granite 4.2 3B is 434.8% slower
Price per 1M tokens (in / out)	$0.10 / $0.50	$0.03 / $0.12
Input modalities	Text, Image	Text

Open this matchup in the interactive picker GPT-6 Luna (Low): what beats it Granite 4.2 3B: what beats it

Today's Pareto frontier

Against the frontier

GPT-6 Luna (Low) is on today's frontier: nothing is both smarter and cheaper.
Granite 4.2 3B is off the frontier: at the same or lower cost, GPT-6 Luna (Low) scores 21.50 for $10.6.

GPT-6 Luna (Low)Granite 4.2 3BToday'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-low/granite-4-2-3b · Markdown: /api/v1/compare/gpt-6-luna-low/granite-4-2-3b?format=md · llms.txt · agent skill