GPT-5.5 (High) vs GPT-6 Astra (Xhigh)
Which is better for the money: GPT-5.5 (High) 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 15.4 points higher (52.4 vs 37.0) but costs 1.2× as much to run the benchmark ($3803 vs $3181; both flagship class). Pick GPT-6 Astra (Xhigh) when the extra intelligence is worth the premium, otherwise GPT-5.5 (High).
| Metric | GPT-5.5 (High) | GPT-6 Astra (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 37.0 | 52.4 | +41.6% GPT-6 Astra (Xhigh) is 41.6% more intelligent |
| Total AA cost (lower is better) | $3,181.05 | $3,802.98 | +19.6% GPT-6 Astra (Xhigh) is 19.6% more expensive |
| End-to-end time (lower is better) | 39.78s | 188.57s | +374.0% GPT-6 Astra (Xhigh) is 374.0% slower |
| Price per 1M tokens (in / out) | $5.00 / $30.0 | $10.0 / $50.0 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Astra (Xhigh) vs GPT-5.5 (High): 41.6% more intelligence, 19.6% more cost to run the AA benchmark, and 374.0% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.5 (High) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.
- GPT-6 Astra (Xhigh) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.
GPT-5.5 (High)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-5-5-high/gpt-6-astra-xhigh · Markdown: /api/v1/compare/gpt-5-5-high/gpt-6-astra-xhigh?format=md · llms.txt · agent skill