Claude Opus 5.5 (Low, Default Fallback) vs Grok 4.3 (Non-reasoning)
Which is better for the money: Claude Opus 5.5 (Low, Default Fallback) by Anthropic or Grok 4.3 (Non-reasoning) by SpaceXAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Depends on your budget
Claude Opus 5.5 (Low, Default Fallback) scores 28.3 points higher (42.3 vs 14.0) but costs 3.4× as much to run the benchmark ($860 vs $250; premium vs mid-range cost classes). They are not alternatives at one budget: pick Claude Opus 5.5 (Low, Default Fallback) when you need intelligence above 14.0, and Grok 4.3 (Non-reasoning) when 14.0 is enough.
| Metric | Claude Opus 5.5 (Low, Default Fallback) | Grok 4.3 (Non-reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 42.3 | 14.0 | −66.9% Grok 4.3 (Non-reasoni… is 66.9% less intelligent |
| Total AA cost (lower is better) | $860.33 | $250.37 | −70.9% Grok 4.3 (Non-reasoni… is 70.9% cheaper |
| End-to-end time (lower is better) | 15.14s | 5.86s | −61.3% Grok 4.3 (Non-reasoni… is 61.3% faster |
| Price per 1M tokens (in / out) | $4.00 / $20.0 | $1.25 / $2.50 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.3 (Non-reasoning) vs Claude Opus 5.5 (Low, Default Fallback): 66.9% less intelligence, 70.9% less cost to run the AA benchmark, and 61.3% faster end-to-end.
Against the frontier
- Claude Opus 5.5 (Low, Default Fallback) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Xhigh) scores 51.00 for $662.
- Grok 4.3 (Non-reasoning) is off the frontier: at the same or lower cost, MiMo-V2.6-Pro scores 46.30 for $207.
Compare something else
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-opus-5-5-low/grok-4-3-non-reasoning · Markdown: /api/v1/compare/claude-opus-5-5-low/grok-4-3-non-reasoning?format=md · llms.txt · agent skill