Claude Fable 5.1 (Medium, Default Fallback) vs Grok 4.3 (High)
Which is better for the money: Claude Fable 5.1 (Medium, Default Fallback) by Anthropic or Grok 4.3 (High) by SpaceXAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Trade-off
Verdict
Depends on your budget
Claude Fable 5.1 (Medium, Default Fallb… scores 24.0 points higher (48.9 vs 24.9) but costs 11× as much to run the benchmark ($3983 vs $363; flagship vs mid-range cost classes). They are not alternatives at one budget: pick Claude Fable 5.1 (Medium, Default Fallb… when you need intelligence above 24.9, and Grok 4.3 (High) when 24.9 is enough.
| Metric | Claude Fable 5.1 (Medium, Default Fallback) | Grok 4.3 (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 48.9 | 24.9 | −49.1% Grok 4.3 (High) is 49.1% less intelligent |
| Total AA cost (lower is better) | $3,983.28 | $363.24 | −90.9% Grok 4.3 (High) is 90.9% cheaper |
| End-to-end time (lower is better) | 14.35s | 28.87s | +101.2% Grok 4.3 (High) is 101.2% slower |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $1.25 / $2.50 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.3 (High) vs Claude Fable 5.1 (Medium, Default Fallback): 49.1% less intelligence, 90.9% less cost to run the AA benchmark, and 101.2% slower end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Fable 5.1 (Medium, Default Fallback) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.
- Grok 4.3 (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Medium) scores 47.80 for $361.
Claude Fable 5.1 (Medium, Default Fallback)Grok 4.3 (High)Today's Pareto frontierEvery other model
Matchup
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