TAU2
Measured May 29, 2026Source
Score
0.96
Models9 0 
Grok 4.20 0309 (Reasoning)
xAIxAIUnited States
Grok 4.20 0309 (Reasoning) is a reasoning-focused model from xAI's Grok 4 series. It is optimized for complex problem-solving, logical deduction, and tasks requiring step-by-step thinking or chain-of-thought processes.
ReasoningCodingFastCheapLong context
Input / 1M tokens
$2.00Output / 1M tokens
$6.00Output tokens/s
181.6First-token seconds
15.57sSupported plans
0Benchmark history
Evaluations
Terminalbench Hard
Measured May 29, 2026Source
Score
0.41
Lcr
Measured May 29, 2026Source
Score
0.59
Ifbench
Measured May 29, 2026Source
Score
0.83
Scicode
Measured May 29, 2026Source
Score
0.45
Hle
Measured May 29, 2026Source
Score
0.3
Gpqa
Measured May 29, 2026Source
Score
0.89
Artificial Analysis Coding Index
Measured May 29, 2026Source
Score
42.2
Artificial Analysis Intelligence Index
Measured May 29, 2026Source
Score
48.5
Plan availability
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