Claude Fable 5.1 vs Grok Build 0.1

Price, context window & benchmark comparison

A

Claude Fable 5.1

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

Grok Build 0.1

xAI
$1.00 / $2.00
Input / Output · per 1M tokens
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A
X
Verdict: Grok Build 0.1 is 16.0× cheaper than Claude Fable 5.1 on a typical 3:1 input/output mix. Claude Fable 5.1 has the larger context window (1M vs 256K).
Claude Fable 5.1Grok Build 0.1
Input price / 1M$10.00$1.00
Output price / 1M$50.00$2.00
Blended price (3:1)$20.00$1.25
Cached input / 1M$0.25$0.20
Context window1M256K
Max output128K230K
Intelligence index53.4
Coding index81.651.5
Providers44
Best provider uptime (30m)100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-09-012026-05-20
Retirement

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FAQ

Which is cheaper, Claude Fable 5.1 or Grok Build 0.1?

Grok Build 0.1 is 16.0× cheaper than Claude Fable 5.1 on a typical 3:1 input/output mix.

Claude Fable 5.1 vs Grok Build 0.1: which has a bigger context window?

Claude Fable 5.1: 1,000,000 tokens. Grok Build 0.1: 256,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Claude Fable 5.1 ≈ $45,000, Grok Build 0.1 ≈ $3,000.

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