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o4 vs Grok 4

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

Verdict

Grok 4 is ~3.5× cheaper on a 3:1 input:output blend.

OpenAI

Deep-reasoning model. Spends more tokens thinking to crush math, science, and hard coding problems.

State-of-the-art math and scienceExtremely high-ceiling reasoning

xAI

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$15.00$5.00

Output / 1M$60.00$15.00

Context200K256K

Max output100K32K

LicenseProprietaryProprietary

Released2026-02-182026-03-01

Benchmarks

LMSYS ELO—1358.0

MMLU Pro93.886.2

HumanEval92.388.4

SWE-Bench68.0—

MATH96.286.5

GPQA82.5—

IFEval—85.0

Per-task cost

Summarize a 1-hour meeting transcript$0.255$0.082

Review a 500-line pull request$0.240$0.070

Answer a customer support ticket$0.093$0.027

Extract structured data from a resume$0.135$0.040

Debug a stack trace with context$0.210$0.060

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

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