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Gemini 2.5 Flash vs Grok 4

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

Verdict

Grok 4 leads on LMSYS ELO (1358 vs 1312). Gemini 2.5 Flash is ~14.3× cheaper on a 3:1 input:output blend.

Google DeepMind

Google’s price/performance darling. 1M context at $0.30/M input — nobody comes close on throughput-per-dollar.

Absurd cost-to-context ratioFast multimodalFree tier via AI Studio

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$0.30$5.00

Output / 1M$1.20$15.00

Context1.0M256K

Max output32K32K

LicenseProprietaryProprietary

Released2026-02-052026-03-01

Benchmarks

LMSYS ELO1312.01358.0

MMLU Pro82.186.2

HumanEval85.888.4

MATH84.286.5

MMMU74.6—

IFEval86.185.0

Per-task cost

Summarize a 1-hour meeting transcript$0.0051$0.082

Review a 500-line pull request$0.0048$0.070

Answer a customer support ticket$0.0019$0.027

Extract structured data from a resume$0.0027$0.040

Debug a stack trace with context$0.0042$0.060

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

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