GPT-5.6 Terra (Medium) vs GPT-6 Astra (Xhigh)
Which is better for the money: GPT-5.6 Terra (Medium) by OpenAI or GPT-6 Astra (Xhigh) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Trade-off
Verdict
Depends on your budget
GPT-6 Astra (Xhigh) scores 22.3 points higher (52.4 vs 30.1) but costs 8.5× as much to run the benchmark ($3803 vs $447; flagship vs mid-range cost classes). They are not alternatives at one budget: pick GPT-6 Astra (Xhigh) when you need intelligence above 30.1, and GPT-5.6 Terra (Medium) when 30.1 is enough.
| Metric | GPT-5.6 Terra (Medium) | GPT-6 Astra (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 30.1 | 52.4 | +74.1% GPT-6 Astra (Xhigh) is 74.1% more intelligent |
| Total AA cost (lower is better) | $446.53 | $3,802.98 | +751.7% GPT-6 Astra (Xhigh) is 8.5× more expensive |
| End-to-end time (lower is better) | 5.99s | 188.57s | +3048.1% GPT-6 Astra (Xhigh) is 3048.1% slower |
| Price per 1M tokens (in / out) | $2.00 / $12.0 | $10.0 / $50.0 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Astra (Xhigh) vs GPT-5.6 Terra (Medium): 74.1% more intelligence, 751.7% more cost to run the AA benchmark, and 3048.1% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.6 Terra (Medium) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Medium) scores 47.80 for $361.
- GPT-6 Astra (Xhigh) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.
GPT-5.6 Terra (Medium)GPT-6 Astra (Xhigh)Today'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-5-6-terra-medium/gpt-6-astra-xhigh · Markdown: /api/v1/compare/gpt-5-6-terra-medium/gpt-6-astra-xhigh?format=md · llms.txt · agent skill