Claude Opus 5.5 (Medium, Default Fallback) vs Grok 4.3 (Non-reasoning)
Which is better for the money: Claude Opus 5.5 (Medium, 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 (Medium, Default Fallba… scores 37.2 points higher (51.2 vs 14.0) but costs 6.5× as much to run the benchmark ($1627 vs $250; premium vs mid-range cost classes). They are not alternatives at one budget: pick Claude Opus 5.5 (Medium, Default Fallba… when you need intelligence above 14.0, and Grok 4.3 (Non-reasoning) when 14.0 is enough.
| Metric | Claude Opus 5.5 (Medium, Default Fallback) | Grok 4.3 (Non-reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 51.2 | 14.0 | −72.7% Grok 4.3 (Non-reasoni… is 72.7% less intelligent |
| Total AA cost (lower is better) | $1,626.81 | $250.37 | −84.6% Grok 4.3 (Non-reasoni… is 84.6% cheaper |
| End-to-end time (lower is better) | 21.78s | 5.89s | −73.0% Grok 4.3 (Non-reasoni… is 73.0% 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 (Medium, Default Fallback): 72.7% less intelligence, 84.6% less cost to run the AA benchmark, and 73.0% faster end-to-end.
Against the frontier
- Claude Opus 5.5 (Medium, Default Fallback) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- 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-medium/grok-4-3-non-reasoning · Markdown: /api/v1/compare/claude-opus-5-5-medium/grok-4-3-non-reasoning?format=md · llms.txt · agent skill