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Claude Fable 5 vs Grok Build 0.1

Claude Fable 5 (Anthropic) and Grok Build 0.1 (xAI) compared on benchmarks, pricing, context window, and use-case rankings.

Grok Build 0.1 is cheaper on input tokens — $1.00 vs $10.00 per 1M.
Claude Fable 5 has a larger context window (1M vs 256K tokens).

Claude Fable 5Anthropic · 18 in the newsGrok Build 0.1xAI

Scores

Intelligence (ECI)161—

Coding100—

Math97—

Reasoning & Knowledge97—

Agentic & Tools97—

Specifications

DeveloperAnthropicxAI

FamilyClaudeGrok

ReleasedJun 9, 2026May 20, 2026

Parameters——

AvailabilityAPI access—

Context window1M256K

Price — $/M input$10.00$1.00

Price — $/M output$50.00$2.00

Inputstext, image, filetext, image

Outputstexttext

Benchmarks

AIME 2024/2025100%—

APEX45%—

GPQA Diamond93%—

Humanity's Last Exam53%—

SciCode60%—

SimpleBench82%—

SimpleQA Verified68%—

WebDev Arena1654—

WeirdML88%—

τ²-bench99%—

Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.

Frequently asked questions

Which is cheaper, Claude Fable 5 or Grok Build 0.1?

Grok Build 0.1 is cheaper on input tokens at $1.00 per million, versus $10.00 (representative OpenRouter pricing).

Which has a larger context window, Claude Fable 5 or Grok Build 0.1?

Claude Fable 5 supports up to 1M tokens, compared with 256K for the other.

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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.