GPT-5.6 Luna (Medium) vs Granite 4.2 8B
Which is better for the money: GPT-5.6 Luna (Medium) 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.
Clear winner
Verdict
Pick GPT-5.6 Luna (Medium)
Granite 4.2 8B vs GPT-5.6 Luna (Medium): 55.6% less intelligence, 19.7% more cost to run the AA benchmark, and 574.4% slower end-to-end.
| Metric | GPT-5.6 Luna (Medium) | Granite 4.2 8B | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 25.0 | 11.1 | −55.6% Granite 4.2 8B is 55.6% less intelligent |
| Total AA cost (lower is better) | $44.32 | $53.07 | +19.7% Granite 4.2 8B is 19.7% more expensive |
| End-to-end time (lower is better) | 5.82s | 39.25s | +574.4% Granite 4.2 8B is 574.4% slower |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $0.06 / $0.25 | |
| Input modalities | Text, Image | Text |
Today's Pareto frontier
Against the frontier
- GPT-5.6 Luna (Medium) is off the frontier: at the same or lower cost, GPT-6 Luna (Medium) scores 29.90 for $31.2.
- 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-5.6 Luna (Medium)Granite 4.2 8BToday's Pareto frontierOpen-weights frontierEvery other model
Matchup
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-5-6-luna-medium/granite-4-2-8b · Markdown: /api/v1/compare/gpt-5-6-luna-medium/granite-4-2-8b?format=md · llms.txt · agent skill