Grok 4 optimized for fast reasoning.
LLM Gateway routes requests to the best providers that are able to handle your prompt size and parameters.
Grok 4 optimized for fast reasoning. You can access it through LLM Gateway's OpenAI-compatible API with automatic provider routing, fallback, and cost analytics.
Pricing for Grok 4 Fast Reasoning on LLM Gateway starts at $0.20 per million input tokens and $0.50 per million output tokens, depending on the provider. The pricing table above always reflects the current per-provider rates.
Grok 4 Fast Reasoning supports a context window of up to 2,000,000 tokens on its largest provider deployment.
Grok 4 Fast Reasoning is served by xAI through LLM Gateway. Requests are automatically routed to the best available provider, with fallback when a provider has issues.
Yes. Grok 4 Fast Reasoning supports both tool (function) calling and structured JSON outputs through LLM Gateway.
Grok 4 Fast Reasoning was released on July 9, 2025.
Grok STT 1.0
$0.00 in / $0.00 out per 1M
Grok 4.5
500,000 context$2.00 in / $6.00 out per 1M
Grok Imagine Video 1.5
2,000 context$0.00 in / $0.00 out per 1M
Grok Imagine Video 1.5 Preview
2,000 context$0.00 in / $0.00 out per 1M
Grok Build 0.1
256,000 context$1.00 in / $2.00 out per 1M
Grok 4.3
1,000,000 context$1.25 in / $2.50 out per 1M