GPT-6 Luna (Medium) vs Mercury 2.5
Which is better for the money: GPT-6 Luna (Medium) by OpenAI or Mercury 2.5 by Inception? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Clear winner
Verdict
Pick GPT-6 Luna (Medium)
Mercury 2.5 vs GPT-6 Luna (Medium): 58.9% less intelligence, 599.7% more cost to run the AA benchmark, and end-to-end time not fully reported.
| Metric | GPT-6 Luna (Medium) | Mercury 2.5 | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 29.9 | 12.3 | −58.9% Mercury 2.5 is 58.9% less intelligent |
| Total AA cost (lower is better) | $31.17 | $218.11 | +599.7% Mercury 2.5 is 7.0× more expensive |
| End-to-end time (lower is better) | Not reported | 4.18s | — not comparable |
| Price per 1M tokens (in / out) | $0.10 / $0.50 | $0.25 / $0.75 | |
| Input modalities | Text, Image | Text |
Today's Pareto frontier
Against the frontier
- GPT-6 Luna (Medium) is on today's frontier: nothing is both smarter and cheaper.
- Mercury 2.5 is off the frontier: at the same or lower cost, MiMo-V2.6-Pro scores 46.30 for $207.
GPT-6 Luna (Medium)Mercury 2.5Today's Pareto frontierEvery other model
Matchup
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-6-luna-medium/mercury-2-5 · Markdown: /api/v1/compare/gpt-6-luna-medium/mercury-2-5?format=md · llms.txt · agent skill