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57Small and fastProvisional score

Grok 4.20

Grok 4.20

xAI's fast tier: quick, cheap, and priced by how much context you actually use.

Updated

Visit Grok 4.20
Grok 4.20

The read

Grok 4.20 is the volume model in the line-up, and its pricing is the interesting part: it charges one rate below a long-context threshold and a higher one above it, so short calls stay genuinely cheap. Throughput is among the best measured anywhere. It is a clear step down from 4.5 on anything that needs sustained reasoning, which is the deal.

Where it shines

  • Among the highest measured output speeds of any hosted model
  • Tiered context pricing keeps short calls very cheap
  • Same directness as the larger Grok models

Worth knowing first

  • Long prompts cross into a materially higher price band
  • Well behind 4.5 on sustained multi-step reasoning

Index score

76.9

Provisional. This score is read from the product's public capability, not from the one-prompt rebuild the fully reviewed entries went through, so treat it as a placing rather than a verdict.

Craft71
Speed93
Control78
Value84
Rank
57 of 73
Builds
LLMs
Category
Small and fast
Output
Text and code over an API
Pricing
Paid only
Best for
High-throughput work with mostly short prompts

Scores are our own editorial judgement, weighted craft 55, speed 10, control 15 and value 20.

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