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Claude Sonnet 4.6 vs Grok 4

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

Verdict

Claude Sonnet 4.6 leads on LMSYS ELO (1368 vs 1358). Claude Sonnet 4.6 is ~1.3× cheaper on a 3:1 input:output blend.

Anthropic

The workhorse. Near-Opus quality at 1/5 the cost. The default choice for production code and agent workloads.

Excellent cost/quality ratioFast inferenceGreat for Cursor/Claude Code

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$3.00$5.00

Output / 1M$15.00$15.00

Context500K256K

Max output64K32K

LicenseProprietaryProprietary

Released2025-11-042026-03-01

Benchmarks

LMSYS ELO1368.01358.0

MMLU Pro88.786.2

HumanEval92.188.4

SWE-Bench64.5—

MATH85.086.5

GPQA59.4—

MMMU74.1—

IFEval90.585.0

Per-task cost

Summarize a 1-hour meeting transcript$0.052$0.082

Review a 500-line pull request$0.054$0.070

Answer a customer support ticket$0.021$0.027

Extract structured data from a resume$0.030$0.040

Debug a stack trace with context$0.048$0.060

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

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