Grok 4.1
xai/grok-4.1Frontier capability with real-time grounding, answers informed by the live world.
Model overview
Context window
256K
tokens
Input price
—
quoted on request
Output price
—
quoted on request
Weekly volume
—
tokens / week
Open weights
No
API only
Capabilities
4
of 11 tags
Description
Grok 4.1 is a language model from xAI. Webparam does not stock this model yet and can source it on request — tell us what you need it for and we will come back with availability and a price. xAI’s stated focus is real-time-grounded frontier models. The weights are not published, so it is API-only.
Capabilities
- Tool calling
- Calls functions you define and returns their arguments as structured data, the basis of agents.
- JSON mode
- Constrains the response to valid JSON matching a schema you supply.
- Streaming
- Emits tokens as they are generated, so answers appear progressively rather than all at once.
- Vision input
- Accepts images alongside text in the prompt.
Strengths & weaknesses
Strengths
- Real-time information grounding
- Strong reasoning without a separate model
- Fast iteration
Weaknesses
- Premium pricing
- Smaller enterprise track record
Pricing
Free| Rate | Price | Unit |
|---|---|---|
| Input | $0.00 | per 1M tokens |
| Output | — not charged | — |
Free at the point of use; fair-use rate limits apply to the free tier. Illustrative placeholder pricing.
Context window
256Ktokens
covers prompt and response together, so a long input leaves less room for the answer.
Supported features
| Feature | Support |
|---|---|
| Tool calling | Supported |
| JSON mode | Supported |
| Streaming | Supported |
| Vision input | Supported |
| Audio input | Not supported |
| Long context | Not supported |
| Open weights | Not supported |
| Reasoning | Not supported |
| Fine-tunable | Not supported |
| Batch | Not supported |
| Caching | Not supported |
Example use cases
Current-events products
Real-time information grounding
Research with fresh data
Strong reasoning without a separate model
General frontier work
Fast iteration
Related models
Comparison
| Attribute | Grok 4.1 | GPT-5.1 | Grok 4 Fast |
|---|---|---|---|
| Context window | 256K | 400K | 2M |
| Input price | $0.00 | $0.00 | $0.00 |
| Output price | — not charged | — not charged | — not charged |
| Tool calling | Supported | Supported | Supported |
| JSON mode | Supported | Supported | Supported |
| Vision input | Supported | Supported | Not supported |
| Open weights | Not supported | Not supported | Not supported |
| Prompt caching | Not supported | Supported | Not supported |
Best value in each row is highlighted. Illustrative placeholder data.
Provider information
View xAI →xAI · San Francisco, United States · est. 2023
xAI built one of the largest training clusters in existence and iterated Grok to the frontier at unusual speed. Its models are distinguished by real-time grounding and enormous fast-inference context, Grok 4 Fast's 2M-token window at commodity prices reset long-context economics.
Recent releases
Documentation
Frequently asked questions
Input is billed at $0.00 per 1M tokens, and there is no separate output charge. Every figure on this page is an illustrative placeholder.