GPT-5.5 Instant (June 2026) vs Grok 4.3 (High)
Which is better for the money: GPT-5.5 Instant (June 2026) by OpenAI or Grok 4.3 (High) by SpaceXAI? 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-5.5 Instant (June 2026) scores 1.1 points higher (26.0 vs 24.9) but costs 2.7× as much to run the benchmark ($987 vs $363; premium vs mid-range cost classes). Pick GPT-5.5 Instant (June 2026) when the extra intelligence is worth the premium, otherwise Grok 4.3 (High).
| Metric | GPT-5.5 Instant (June 2026) | Grok 4.3 (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 26.0 | 24.9 | −4.2% Grok 4.3 (High) is 4.2% less intelligent |
| Total AA cost (lower is better) | $986.85 | $363.24 | −63.2% Grok 4.3 (High) is 63.2% cheaper |
| End-to-end time (lower is better) | 16.68s | 32.60s | +95.4% Grok 4.3 (High) is 95.4% slower |
| Price per 1M tokens (in / out) | $5.00 / $30.0 | $1.25 / $2.50 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.3 (High) vs GPT-5.5 Instant (June 2026): 4.2% less intelligence, 63.2% less cost to run the AA benchmark, and 95.4% 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 4.3 (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Medium) scores 47.80 for $361.
GPT-5.5 Instant (June 2026)Grok 4.3 (High)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-instant-06-26/grok-4-3 · Markdown: /api/v1/compare/gpt-5-5-instant-06-26/grok-4-3?format=md · llms.txt · agent skill