X-Ai/Grok-4-Fast-Reasoning API Pricing
xAI · released 2025-12-18
X-Ai/Grok-4-Fast-Reasoning price
No official API price published for X-Ai/Grok-4-Fast-Reasoning yet.
Benchmarks
| Benchmark | Value | Source | As of |
|---|---|---|---|
| Epoch Capabilities Index (ECI) | No public data yet | ||
| Epoch Mock AIME accuracy | No public data yet | ||
| Epoch FrontierMath (T1–3) accuracy | No public data yet | ||
| Arena text rating | 1405 | arena | 2026-10-28 |
| Arena coding rating (human preference votes, not task accuracy) | 1439 | arena | 2026-10-28 |
| Arena math rating | 1411 | arena | 2026-10-28 |
| Arena WebDev rating | 1159 | arena | 2026-10-28 |
More from xAI
| Model | Released | Blended $/1M |
|---|---|---|
| Grok Voice 3.0 | 2026-10-14 | — |
| Grok Imagine Video 1.5 Lite | 2026-10-01 | — |
| Grok 4.7 | 2026-09-21 | $3.00 |
| Grok Voice Transcribe 2.0 | 2026-09-17 | — |
| Grok 4.6 | 2026-08-12 | $3.00 |
| Grok Imagine Image 2.0 | 2026-08-07 | — |
| Grok Voice STT 1.0 | 2026-08-04 | — |
| Grok Voice TTS 1.0 | 2026-07-31 | — |
Prices: xAI's official list price as recorded by None; benchmarks: see sources below; last synced 2026-11-06.
FAQ
Who develops X-Ai/Grok-4-Fast-Reasoning?
X-Ai/Grok-4-Fast-Reasoning is developed by xAI, released 2025-12-18.
Is X-Ai/Grok-4-Fast-Reasoning's API pricing published?
No — as of the last data sync (2026-11-06), neither models.dev nor LiteLLM has published official API pricing for X-Ai/Grok-4-Fast-Reasoning. This page updates automatically once pricing is available.
Which benchmarks is X-Ai/Grok-4-Fast-Reasoning scored on?
X-Ai/Grok-4-Fast-Reasoning has published results for: Arena text rating; Arena coding rating (human preference votes, not task accuracy); Arena math rating; Arena WebDev rating. The Benchmarks table on this page shows each score with its source and date.
Where does this data come from?
Pricing for X-Ai/Grok-4-Fast-Reasoning comes from models.dev and LiteLLM (open MIT-licensed catalogs); benchmark scores come from Epoch AI and LMArena (open CC BY 4.0 licenses) — see /data-sources/. Last synced 2026-11-06.