Grok 4.20

xAI

2M context at frontier-cheap output pricing. Strong on raw math and HumanEval.

FrontierProprietary2M contextReleased Mar 2026textvisioncode

API price · per 1M tokens

$2/$6

input / output

≈ $3.00/M blended

Benchmarks

Bar shows this model's score; tick shows the best score across all tracked models for context.

SWE-bench VerifiedReal GitHub issues, human-verified patches. The standard coding-agent benchmark.

78.0/ best 90.1

SWE-bench Pro2,294 harder real-world GitHub issues. Where the frontier separates now.

56.0/ best 69.2

Terminal-Bench 2.xAgentic command-line workflows — planning, iteration, tool coordination.

67.0/ best 84.0

GPQA DiamondGoogle-proof graduate-level science Q&A. General reasoning proxy.

74.5/ best 94.4

MMLU-ProMulti-task language understanding across 120+ academic subjects.

80.0/ best 93.0

HumanEval+Functional code generation from docstrings.

94.0/ best 96.0

MATH-500Competition-style math problems.

96.5/ best 97.8

Humanity's Last ExamHardest reasoning benchmark (with tools). ~50% = near frontier.

40.0/ best 57.9

AIME 2025American Invitational Mathematics Examination.

91.7/ best 96.5

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