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Atlas / xAI / Grok 4 Fast Reasoning

Grok 4 Fast Reasoning

Fast Grok reasoning model for latency-sensitive tasks.

Preview Tools
Input
$0.20
Output
$0.50
per 1M tokens Source ↗

Pricing history

TierUnitInputCached inputOutputEffectiveSource
Standard Per 1M tokens $0.20 — $0.50 March 1, 2026 Source
Standard Per 1M tokens $0.20 — $0.50 Feb. 22, 2026 Source
Standard Per 1M tokens $0.20 — $0.50 Feb. 15, 2026 Source
Standard Per 1M tokens $0.20 — $0.50 Feb. 8, 2026 Source
Standard Per 1M tokens $0.20 — $0.50 Feb. 1, 2026 Source
Standard Per 1M tokens $0.20 — $0.50 Jan. 25, 2026 Source
Standard Per 1M tokens $0.20 — $0.50 Jan. 11, 2026 Source
Standard Per 1M tokens $0.20 — $0.50 Jan. 10, 2026 Source