Benchmarks

xAI: Grok 4 Fast

x-ai/grok-4-fast

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model...

Prompt $/1M
$0.200
Completion $/1M
$0.500
Context
2,000,000 tok
Best provider
61 tok/s · xAI

Specs

Model id
x-ai/grok-4-fast
Display name
xAI: Grok 4 Fast
Modality
text+image+file->text
Tokenizer
Grok
Instruct type
—
Context length
2,000,000
Max completion
30,000
Prompt $/1M
$0.200
Completion $/1M
$0.500
Free tier
no

Capabilities

  • Function callingno
  • JSON modeno
  • System promptno
  • Visionyes
  • Moderatedno

Benchmark scores

Each axis is one benchmark, normalized to the best model in the field.

No benchmark data for this model.

Speed by provider

Providertok/s
xAIfastest61
xAI: Grok 4 Fast - Benchmarks, Pricing and Speed | TryAii