Claude Fable 5.1 vs Grok 4.5

Price, context window & benchmark comparison

A

Claude Fable 5.1

Anthropic
$10.00 / $50.00
Input / Output · per 1M tokens
VS
X

Grok 4.5

xAI
$2.00 / $6.00
Input / Output · per 1M tokens
Compare different models
A
X
Verdict: Grok 4.5 is 6.7× cheaper than Claude Fable 5.1 on a typical 3:1 input/output mix. Claude Fable 5.1 scores higher on the Artificial Analysis Intelligence Index (53.4 vs 38.8). Claude Fable 5.1 has the larger context window (1M vs 500K).
Claude Fable 5.1Grok 4.5
Input price / 1M$10.00$2.00
Output price / 1M$50.00$6.00
Blended price (3:1)$20.00$3.00
Cached input / 1M$0.25$0.30
Context window1M500K
Max output128K450K
Intelligence index53.438.8
Coding index81.672.4
Providers44
Best provider uptime (30m)100.0%100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-09-012026-07-08
Retirement——

Cost calculator

FAQ

Which is cheaper, Claude Fable 5.1 or Grok 4.5?

Grok 4.5 is 6.7× cheaper than Claude Fable 5.1 on a typical 3:1 input/output mix.

Claude Fable 5.1 vs Grok 4.5: which has a bigger context window?

Claude Fable 5.1: 1,000,000 tokens. Grok 4.5: 500,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Claude Fable 5.1 ≈ $45,000, Grok 4.5 ≈ $7,000.

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