xAI's fast agentic tool-calling model with a 2M context window and built-in reasoning
Grok 4.1 Fast (Reasoning) by xai is offered by 11 providers on this page. Public prices are shown for 9 of them. Its reference price is $0.20 per 1M input tokens and $1.50 per 1M output tokens.
The context window is 256,000 tokens at the reference host, but hosts report different limits, from 128,000 to 2,000,000, so the usable window depends on the provider you pick. It supports reasoning, tool use, and structured output. Accepted input modalities are Text, Image, PDF, Audio, and Video. Providers report the capability flags inconsistently, so verify a specific feature against the host you plan to use. Its training knowledge cuts off at 2025-11.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Jiekou.AI grok-4-1-fast-reasoning | Gateway | $0.18 | $0.45 | — | — | 2,000,000 ⚠ | 2,000,000 | |
| 302.AI grok-4-1-fast-reasoning | Gateway | $0.20 | $0.50 | — | — | 2,000,000 ⚠ | 30,000 | |
| Azure grok-4-1-fast-reasoning | Cloud | $0.20 | $0.50 | $0.05 | — | 128,000 ⚠ | 8,192 | |
| FrogBot grok-4-1-fast-reasoning | Gateway | $0.20 | $0.50 | $0.05 | — | 2,000,000 ⚠ | 128,000 | |
| Vercel AI Gateway | Cloud | $0.20 | $0.50 | $0.05 | — | 1,000,000 ⚠ | 1,000,000 | |
| DevPass (LLM Gateway) grok-4-1-fast-reasoning | Gateway | $0.20 | $0.50 | $0.05 | — | 2,000,000 ⚠ | 30,000 | |
| Vertex | Cloud | $0.20 | $0.50 | $0.05 | — | 128,000 ⚠ | 30,000 | deprecated |
| Helicone grok-4-1-fast-reasoning | Gateway | $0.20 | $0.50 | $0.05 | — | 2,000,000 ⚠ | 2,000,000 | |
| FrogBot grok-code-fast-1 | Gateway | $0.20 | $1.50 | $0.02 | — | 256,000 | 128,000 | |
| Poe | Gateway | — | — | — | — | 2,000,000 ⚠ | 30,000 | hostTable.undisclosed |
| Qiniu | Gateway | — | — | — | — | — ⚠ | 2,000,000 | hostTable.undisclosed |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
8 / 11 providers expose no reasoning control (reasoning_options: []).