Atlas / xAI / Grok 4.1 Fast Reasoning

Grok 4.1 Fast Reasoning

Updated fast reasoning variant with improved quality.

Preview Tools

Input

$0.20

Output

$0.50

Cached input

$0.05

per 1M tokens Source ↗

Pricing history

TierUnitInputCached inputOutputEffectiveSource

Standard Per 1M tokens $0.20 $0.05 $0.50 March 1, 2026 Source

Standard Per 1M tokens $0.20 $0.05 $0.50 Feb. 22, 2026 Source

Standard Per 1M tokens $0.20 $0.05 $0.50 Feb. 15, 2026 Source

Standard Per 1M tokens $0.20 $0.05 $0.50 Feb. 8, 2026 Source

Standard Per 1M tokens $0.20 $0.05 $0.50 Feb. 1, 2026 Source

Standard Per 1M tokens $0.20 $0.05 $0.50 Jan. 25, 2026 Source

Standard Per 1M tokens $0.20 $0.05 $0.50 Jan. 11, 2026 Source

Standard Per 1M tokens $0.20 — $0.50 Jan. 10, 2026 Source