X-Ai/Grok-4-Fast-Reasoning

grok-4-fast-reasoning

A fast model for responsive chat, reasoning, and tool-assisted work.

Fast Grok model for responsive chat, reasoning, and tool-assisted work

2M context2M context

Released2025-12-18

Relays3 sites

text generationreasoningtool usefast

Model information

Model ID: grok-4-fast-reasoning
Context: 2M
Max input: -
Max output: 2M
Knowledge cutoff: -
Open weights: Not supported
License: -
Release date: 2025-12-18

Input

Text: SupportedImage: SupportedAudio: SupportedVideo: SupportedPDF: Not supportedFile: Supported

Output

Text: SupportedImage: Not supportedAudio: Not supportedVideo: Not supported

API capabilities

Reasoning: SupportedTool call: SupportedStructured output: UnknownTemperature: Supported

Relay Comparison

Compare token, per-request, or per-second pricing by relay channel.

Unit: token prices are ¥ / 1M tokens; per-request and per-second rows use their shown unit

AIGC Token

aigc-token.comToken billing

Price range ¥0.12 - ¥0.2 / 1M tokens

Cache hit¥0.03

Cache hit¥0.05

Cache hit¥0.05

Channel	Billing	Input	Output	Cache hit	Cache write
Azure	Token	¥0.12	¥0.3	¥0.03	-
AzurePlus	Token	¥0.2	¥0.5	¥0.05	-
default	Token	¥0.2	¥0.5	¥0.05	-

Modelsell

modelsell.comToken billing

Price range ¥0.816 / 1M tokens

Cache hit¥0.204

Channel	Billing	Input	Output	Cache hit	Cache write
xAI	Token	¥0.816	¥2.04	¥0.204	-

ePhone AI

ephone.aiToken billing

Price range ¥0.742 - ¥1.4 / 1M tokens

xai-official-cheap

Cache hit¥0.1855

Cache hit¥0.35

Channel	Billing	Input	Output	Cache hit	Cache write
xai-official-cheap	Token	¥0.742	¥1.85	¥0.1855	-
xai	Token	¥1.4	¥3.5	¥0.35	-

How should X-Ai/Grok-4-Fast-Reasoning relay pricing be compared?

This X-Ai/Grok-4-Fast-Reasoning pricing page compares official pricing with public prices from 3 listed AI gateways. Token prices are shown in CNY per 1M tokens, while per-request, per-second, and per-character rows use the unit shown in the table. Last updated: 10/23/2026, 08:14.

Data sources: Public price catalogs, official pricing records, and monitoring results.
Metric definitions: Uptime means successful probe response rate, fake-rate signals possible model mismatch or abnormal output risk, and latency is average API response time.
Risk note: Relay gateways are third-party services. Pricing, billing, privacy, and stability can change; start with a small top-up and verify reliability before continued use.