Last refreshed 2026-05-16. Next refresh: weekly.
Why use Grok 4 Fast Reasoning on xAI Console?
xAI Console offers Grok 4 Fast Reasoning with pay-as-you-go pricing at $1.25/1M input tokens. xAI, founded by Elon Musk in March 2023, focuses on advancing scientific discovery and understanding the universe through AI.
Compare Grok 4 Fast Reasoning 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: grok-4-fast-reasoninggrok-4-fast-reasoningRequest example
grok-4-fast-reasoning.Gotchas
No curated gotchas have been sourced for this exact provider/model route yet.
Compare Grok 4 Fast Reasoning Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Microsoft Foundry | — | — |
| xAI Console | $1.25 | $2.50 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.25 |
| Output tokens | $2.50 |
Capabilities
About Grok 4 Fast Reasoning
Grok 4 Fast Reasoning is a September 2025 xAI model retiring on 2026-05-15; use Grok 4.3 for current API work.
FAQ
What does Grok 4 Fast Reasoning cost on xAI Console?
On xAI Console, Grok 4 Fast Reasoning costs $1.25 per 1M input tokens and $2.50 per 1M output tokens.
How does xAI Console compare to other Grok 4 Fast Reasoning providers?
Grok 4 Fast Reasoning is available from 2 providers. The cheapest input pricing is $1.25/1M tokens from xAI Console.
What API model ID do I use for Grok 4 Fast Reasoning on xAI Console?
Use the model ID grok-4-fast-reasoning when calling xAI Console's API.
Who created Grok 4 Fast Reasoning?
Grok 4 Fast Reasoning was created by xAI as part of the Grok 4 model family.
Is Grok 4 Fast Reasoning open source?
Grok 4 Fast Reasoning is not open source; the seed data lists it as proprietary.