Claude Fable 5.1vsGrok 4 Fast (free)
Grok 4 Fast (free) is cheaper than Claude Fable 5.1 at $0/M vs $10/M input tokens.
| Spec | Claude Fable 5.1 | Grok 4 Fast (free) |
|---|---|---|
| Input price | $10/M tokens | Free |
| Output price | $50/M tokens | Free |
| Context window | 1.0M tokens | 2.0M tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Sep 2025 |
Our Verdict
Claude Fable 5.1
Grok 4 Fast (free)Runner-up
Not enough votes to call it. On the specs, Claude Fable 5.1 has the edge: bigger model tier, newer.
Too close to call
API pricing
Cost per 1M tokens
Claude Fable 5.1
Input
$10.00
Output
$50.00
Grok 4 Fast (free)
Input
$0.000
Output
$0.000
Where to run it
4 hosts
Grok 4 Fast (free)
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 8 Sep 2026.
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