Prior-generation high-performance Grok model with reasoning and non-reasoning variants, 1M-token context, and text+image input. Still listed and offered in the xAI API alongside the newer flagship Grok 4.3.
profile normalized against the 47-model field
Context window· 1M of 1.05M95%
Max output—
Output speed—
Affordability· $2.50 / Mtok out99%
Capability breadth· 3 of 1127%
Capability switches · 3 of 11
Reasoning mode
Tool / function use
Streaming
JSON mode
Structured outputs
Prompt caching
Fine-tuning
Web search
Code execution
Vision input
Audio input
Specifications
Every value carries a primary source and a verification date.
Capacity
Context window
1M
Pricing
Input $/Mtok
$1.25 / 1M input tokens USD/Mtok
Output $/Mtok
$2.50 / 1M output tokens USD/Mtok
Capabilities
Input modalities
text, image
Output modalities
text
Reasoning mode
Yes
Tool / function use
Yes
Vision input
Yes (image input)
API
API model ID
grok-4.20-0309-reasoning
General
Knowledge cutoff
November 2024
Benchmarks
Sourced evaluation scores, each verified against its primary source.