Grok is xAI’s AI assistant, shipped across X (formerly Twitter) and grok.com, with versions that support real-time info, coding help, multimodal understanding, and image generation.
Early model benchmarks: Grok-1 reported 73% on MMLU and 63.2% on HumanEval.
Early prototype scale: Grok-0 was trained with 33B parameters.
Grok 4.1 live preference (xAI): Preferred 64.78% of the time vs the previous production Grok model during a November 2025 rollout test.
LMArena Elo (xAI): Grok 4.1 Thinking reported at 1483 Elo (#1 overall); non-thinking mode reported at 1465 Elo (#2 overall).
“Grok in the Wild” (research preprint): Grok is called by millions weekly on X; it responds to 62% of requests; 51% of sampled interactions are in English; half of responses get ≤20 views after 48 hours (in their sample).
Grok usage and market share
Apptopia data reported by Reuters shows Grok’s U.S. market share rose from 1.9% in January 2025 to 17.8% in January 2026—about a 9.4× increase year over year.
Bar chart: Grok U.S. market share (Apptopia)
Label
Bar
Value
Jan 2025
1.9%
Dec 2025
14.0%
Jan 2026
17.8%
Max = 17.8%. Widths: Jan 2025 10.67%, Dec 2025 78.65%, Jan 2026 100.00%.
Model benchmark performance
xAI’s published Grok-2 benchmark table reports strong scores across general knowledge, math, and coding tasks.
Bar chart: MMLU score comparison (from xAI’s Grok-2 benchmark table)
Label
Bar
Value
Grok-2
87.5%
GPT-4o
88.7%
Claude 3.5 Sonnet
88.3%
GPT-4 Turbo
86.5%
Max = 88.7%. Widths: Grok-2 98.65%, GPT-4o 100.00%, Claude 3.5 Sonnet 99.55%, GPT-4 Turbo 97.52%.
Pricing and access (X Premium tiers)
X Premium pricing varies by country and platform. Below are the published U.S. web prices; HUF figures use 1 USD = 319.23 HUF (official daily rate for February 17, 2026) and are approximate.
Tier (U.S. web)
Monthly
Annual (USD)
Annual (HUF/year, approx.)
Basic
$3.00
$32.00
10,215 HUF/year
Premium
$8.00
$84.00
26,815 HUF/year
Premium+
$40.00
$395.00
126,096 HUF/year
xAI funding milestones (context for Grok’s compute buildout)
Grok’s rapid iteration has been paired with major fundraising and infrastructure investment by xAI.
Bar chart: Selected xAI funding events
Label
Bar
Value
Series B (May 2024)
$6B
Series C (Dec 2024)
$6B
Debt+Equity (Jul 2025)
$10B
Series E (Jan 2026)
$20B
Max = $20B. Widths: Series B (May 2024) 30.00%, Series C (Dec 2024) 30.00%, Debt+Equity (Jul 2025) 50.00%, Series E (Jan 2026) 100.00%.
Sources
Reuters (Feb 13, 2026) — “Musk’s AI chatbot Grok gains US market share…” https://www.reuters.com/business/media-telecom/musks-ai-chatbot-groks-us-market-share-jumps-amid-sexualized-images-backlash-2026-02-13/
