Last refreshed 2026-05-20. Next refresh: weekly.
Why use Grok 4.1 Fast on OpenRouter?
OpenRouter offers Grok 4.1 Fast with pay-as-you-go pricing at $0.20/1M input tokens. OpenRouter is a multi-provider LLM aggregator offering unified API access to 300+ models from all major labs and emerging providers, with automatic failover for reliability.
Compare Grok 4.1 Fast across 2 providers to find the best fit for your use caseSetup recipe
Docs fallbackUse the provider REST API or SDKCreate a provider API keymodel: x-ai/grok-4.1-fastx-ai/grok-4.1-fastRequest example
x-ai/grok-4.1-fast.Gotchas
- Use provider model ID "x-ai/grok-4.1-fast", not the LLMReference slug "grok-4.1-fast".
Compare Grok 4.1 Fast Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| OpenRouter | $0.20 | $0.50 |
| xAI Console | $1.25 | $2.50 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $0.20 |
| Output tokens | $0.50 |
Capabilities
About Grok 4.1 Fast
Ultra-low latency Grok 4.1 Fast API family. xAI retired grok-4-1-fast-reasoning and grok-4-1-fast-non-reasoning on 2026-05-15; requests now redirect to Grok 4.3 at Grok 4.3 pricing.
FAQ
What does Grok 4.1 Fast cost on OpenRouter?
On OpenRouter, Grok 4.1 Fast costs $0.2 per 1M input tokens and $0.5 per 1M output tokens.
What is the context window for Grok 4.1 Fast on OpenRouter?
Grok 4.1 Fast supports a 2m token context window on OpenRouter.
How does OpenRouter compare to other Grok 4.1 Fast providers?
Grok 4.1 Fast is available from 2 providers. The cheapest input pricing is $0.2/1M tokens from OpenRouter.
What API model ID do I use for Grok 4.1 Fast on OpenRouter?
Use the model ID x-ai/grok-4.1-fast when calling OpenRouter's API.
Who created Grok 4.1 Fast?
Grok 4.1 Fast was created by xAI as part of the Grok 4 model family.
Is Grok 4.1 Fast open source?
Grok 4.1 Fast is not open source; the seed data lists it as proprietary.