GPT-5.5 Instant (June 2026) vs Grok 4.6 (Xhigh)
Which is better for the money: GPT-5.5 Instant (June 2026) by OpenAI or Grok 4.6 (Xhigh) by SpaceXAI? 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
Grok 4.6 (Xhigh) scores 18.2 points higher (44.2 vs 26.0) but costs 2.3× as much to run the benchmark ($2242 vs $987; flagship vs premium cost classes). Pick Grok 4.6 (Xhigh) when the extra intelligence is worth the premium, otherwise GPT-5.5 Instant (June 2026).
| Metric | GPT-5.5 Instant (June 2026) | Grok 4.6 (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 26.0 | 44.2 | +70.0% Grok 4.6 (Xhigh) is 70.0% more intelligent |
| Total AA cost (lower is better) | $986.85 | $2,241.91 | +127.2% Grok 4.6 (Xhigh) is 2.3× more expensive |
| End-to-end time (lower is better) | 16.37s | 40.24s | +145.8% Grok 4.6 (Xhigh) is 145.8% slower |
| Price per 1M tokens (in / out) | $5.00 / $30.0 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.6 (Xhigh) vs GPT-5.5 Instant (June 2026): 70.0% more intelligence, 127.2% more cost to run the AA benchmark, and 145.8% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.5 Instant (June 2026) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Xhigh) scores 51.00 for $662.
- Grok 4.6 (Xhigh) is off the frontier: at the same or lower cost, Claude Opus 5.5 (High, Default Fallback) scores 53.60 for $2172.
GPT-5.5 Instant (June 2026)Grok 4.6 (Xhigh)Today's Pareto frontierEvery other model
Matchup
Compare something else
Agents:
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-5-5-instant-06-26/grok-4-6-xhigh · Markdown: /api/v1/compare/gpt-5-5-instant-06-26/grok-4-6-xhigh?format=md · llms.txt · agent skill