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Llama 4 Behemoth vs Grok 4

Meta vs xAI. Specs, benchmarks, and real per-task cost — all in one page.

Verdict

Grok 4 leads on LMSYS ELO (1358 vs 1342). Llama 4 Behemoth is ~1.9× cheaper on a 3:1 input:output blend. Llama 4 Behemoth is open-weights, the other is proprietary.

Meta

Llama 4 Behemoth

Meta’s open-weights flagship. 405B params, fully open license, runs on every major inference provider.

Best open-weights modelRuns anywhereTransparent training

xAI

Grok 4

xAI’s latest. Real-time X search integration, strong on current events and meme-literate tasks.

Live web/X accessPersonalityFast inference on Colossus

Pricing

Input / 1M$2.50$5.00

Output / 1M$8.00$15.00

Context256K256K

Max output16K32K

LicenseOpen weightsProprietary

Released2025-12-102026-03-01

Benchmarks

LMSYS ELO1342.01358.0

MMLU Pro87.186.2

HumanEval89.388.4

SWE-Bench52.4—

MATH81.586.5

GPQA56.2—

IFEval88.085.0

Per-task cost

Summarize a 1-hour meeting transcript$0.041$0.082

Review a 500-line pull request$0.036$0.070

Answer a customer support ticket$0.014$0.027

Extract structured data from a resume$0.021$0.040

Debug a stack trace with context$0.031$0.060

Per-call cost using published token counts for each task. Real-world prompts vary.

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