Claude Opus 5.5 (Low, Default Fallback) vs Grok 4.5 (High)
Which is better for the money: Claude Opus 5.5 (Low, Default Fallback) by Anthropic or Grok 4.5 (High) by SpaceXAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Clear winner
Verdict
Pick Claude Opus 5.5 (Low, Default Fallback)
Grok 4.5 (High) vs Claude Opus 5.5 (Low, Default Fallback): 8.3% less intelligence, 44.6% more cost to run the AA benchmark, and 81.3% slower end-to-end.
| Metric | Claude Opus 5.5 (Low, Default Fallback) | Grok 4.5 (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 42.3 | 38.8 | −8.3% Grok 4.5 (High) is 8.3% less intelligent |
| Total AA cost (lower is better) | $860.33 | $1,243.85 | +44.6% Grok 4.5 (High) is 44.6% more expensive |
| End-to-end time (lower is better) | 11.16s | 20.23s | +81.3% Grok 4.5 (High) is 81.3% slower |
| Price per 1M tokens (in / out) | $4.00 / $20.0 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Today's Pareto frontier
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 4.5 (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
Claude Opus 5.5 (Low, Default Fallback)Grok 4.5 (High)Today's Pareto frontierEvery other model
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-opus-5-5-low/grok-4-5 · Markdown: /api/v1/compare/claude-opus-5-5-low/grok-4-5?format=md · llms.txt · agent skill