GPT-6.1 Terra (High) vs Mercury 2.5
Which is better for the money: GPT-6.1 Terra (High) by OpenAI or Mercury 2.5 by Inception? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-27.
Trade-off
Verdict
Depends on your budget
GPT-6.1 Terra (High) scores 31.6 points higher (43.9 vs 12.3) but costs 1.3× as much to run the benchmark ($239 vs $189; both mid-range class). Pick GPT-6.1 Terra (High) when the extra intelligence is worth the premium, otherwise Mercury 2.5.
| Metric | GPT-6.1 Terra (High) | Mercury 2.5 | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 43.9 | 12.3 | −72.0% Mercury 2.5 is 72.0% less intelligent |
| Total AA cost (lower is better) | $238.53 | $189.17 | −20.7% Mercury 2.5 is 20.7% cheaper |
| End-to-end time (lower is better) | 11.16s | 4.19s | −62.5% Mercury 2.5 is 62.5% faster |
| Price per 1M tokens (in / out) | $1.00 / $5.00 | $0.25 / $0.75 | |
| Input modalities | Text, Image | Text |
Mercury 2.5 vs GPT-6.1 Terra (High): 72.0% less intelligence, 20.7% less cost to run the AA benchmark, and 62.5% faster end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-6.1 Terra (High) is off the frontier: at the same or lower cost, MiMo-V2.6-Pro scores 46.30 for $207.
- Mercury 2.5 is off the frontier: at the same or lower cost, GPT-6.1 Terra (Medium) scores 41.30 for $175.
GPT-6.1 Terra (High)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-6-1-terra-high/mercury-2-5 · Markdown: /api/v1/compare/gpt-6-1-terra-high/mercury-2-5?format=md · llms.txt · agent skill