Optimized Grok-3 variant for lower latency.
OffRail routes requests to the best providers that are able to handle your prompt size and parameters.
Optimized Grok-3 variant for lower latency. You can access it through OffRail's OpenAI-compatible API with automatic provider routing, fallback, and cost analytics.
Pricing for Grok-3 Fast on OffRail starts at $5.00 per million input tokens and $25.00 per million output tokens, depending on the provider. The pricing table above always reflects the current per-provider rates.
Grok-3 Fast supports a context window of up to 131,072 tokens on its largest provider deployment.
Grok-3 Fast is served by xAI through OffRail. Requests are automatically routed to the best available provider, with fallback when a provider has issues.
Grok-3 Fast supports tool (function) calling and soft JSON output, but NOT strict JSON output schema (its upstream provider does not enforce it).
Grok-3 Fast was released on May 22, 2025.
Grok Imagine Image 2.0
2,000 context$0.00 in / $0.00 out per 1M
Grok 4.6
500,000 context$2.00 in / $6.00 out per 1M
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