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GPT-5 Mini vs Grok 4

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

Verdict

Grok 4 leads on LMSYS ELO (1358 vs 1288). GPT-5 Mini is ~8.6× cheaper on a 3:1 input:output blend.

OpenAI

GPT-5’s smaller, cheaper sibling. Optimized for chat and lightweight agent tasks.

Very low latencyCheap enough for mass consumer apps

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$0.50$5.00

Output / 1M$2.00$15.00

Context256K256K

Max output16K32K

LicenseProprietaryProprietary

Released2026-01-212026-03-01

Benchmarks

LMSYS ELO1288.01358.0

MMLU Pro78.586.2

HumanEval85.588.4

MATH79.886.5

IFEval85.485.0

Per-task cost

Summarize a 1-hour meeting transcript$0.0085$0.082

Review a 500-line pull request$0.0080$0.070

Answer a customer support ticket$0.0031$0.027

Extract structured data from a resume$0.0045$0.040

Debug a stack trace with context$0.0070$0.060

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

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