Private AI
xAI's Grok 4.20 flagship release with tool calling, multimodal input support, and a 2M-token context window. Content policy rejections can still be charged: xAI may pass through a $0.05 moderation-failure fee, or a $0.055 usage-guidelines violation fee, depending on which rejection upstream returns.
Added Mar 31, 2026
Context Window
2.0M
Max Output
131.1K
Avg output tokens (7d)
1.5K tokens
Input Price (Auto)
$2.00/1M
Output Price (Auto)
$6.00/1M
Cache Read (Auto)
$1.00/1M
Capabilities
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
37.0
Auto routing is available for this model. Explicit provider selection is not available.
Loading provider options…
GPQA Diamond
Graduate-level scientific reasoning
91.1%
Better than 95% of models compared
HLE
Humanity's Last Exam
32.2%
Better than 90% of models compared
IFBench
Instruction-following benchmark
81.2%
Better than 99% of models compared
T²-Bench Telecom
Conversational AI agents in dual-control scenarios
93.0%
Better than 89% of models compared
AA-LCR
Long context reasoning evaluation
58.0%
Better than 67% of models compared
SciCode
Python programming for scientific computing
45.6%
Better than 85% of models compared
Terminal-Bench Hard
Agentic coding and terminal use
37.9%
Last updated Aug 4, 2026
Artificial AnalysisBetter than 85% of models compared