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
Input Price (Auto)
$2.00/1M
Output Price (Auto)
$6.00/1M
Capabilities
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
49.3
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Coding Index
40.5
GPQA Diamond
Graduate-level scientific reasoning
91.1%
Better than 98% of models compared
HLE
Humanity's Last Exam
32.2%
Better than 96% 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 91% of models compared
AA-LCR
Long context reasoning evaluation
58.0%
Better than 77% of models compared
SciCode
Python programming for scientific computing
45.6%
Better than 93% of models compared
Terminal-Bench Hard
Agentic coding and terminal use
37.9%
Better than 90% of models compared
Last updated May 15, 2026
Artificial Analysis