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Grok 4.7, xAI's model in llmwise, gets up to 250 messages a month on Pro and is in the 5 free messages you get on sign-up. Grok 4.7 passed 47 of 50 of our test prompts.

A real answer from our test runs

Grok 4.7

Write a JavaScript function mergeIntervals(intervals) that takes an array of [start, end] pairs (numbers, start ≤ end, in any order) and returns a new array in which overlapping or touching intervals are merged, sorted by start. [1, 3] and [3, 5] touch, so they merge into [1, 5]. Don't change the input array. Reply with the whole function in one ```javascript code block: plain JavaScript for Node.js 22, no imports, no TypeScript.

Grok 4.7 · passed our check · September 27, 2026

```javascript
function mergeIntervals(intervals) {
  if (!intervals || intervals.length === 0) return [];

  const sorted = intervals
    .map(([start, end]) => [start, end])
    .sort((a, b) => a[0] - b[0] || a[1] - b[1]);

  const merged = [[sorted[0][0], sorted[0][1]]];

  for (let i = 1; i < sorted.length; i++) {
    const [start, end] = sorted[i];
    const last = merged[merged.length - 1];
    if (start <= last[1]) {
      if (end > last[1]) last[1] = end;
    } else {
      merged.push([start, end]);
    }
  }

  return merged;
}
```

Ask Grok 4.7 your own question: it's in the 5 free messages you get on sign-up, no card.

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Facts about other apps checked September 28, 2026 against xAI docs: Grok website and apps FAQ. Updated September 28, 2026.

Short answer

Grok 4.7 passed 47 of 50 of our test prompts, 20 of the 20 hard ones, and it's in the 5 free messages you get on sign-up. The free message box here is answered by GPT-6 Luna.

The Grok models in llmwise

Every Grok model in llmwise: the free trial, Pro's count, a typical message at its API price, and our test results.

The Grok models
Model	Free trial	On Pro	Typical message, API price	Our test prompts passed
Grok 4.7xAI	Yes	250 a month	$0.0098	47 of 50 (20 of 20 hard)

On Pro: the most messages a month on the model if the month goes to it alone, or a day's on an everyday model. The API price is a 4,000-token question with a 700-token answer at the model's list price as of September 2026; in llmwise you pay per message. Our tests: the 50 prompts of our test runs on September 27, 2026.

Every limit is published. Paid plans also have a monthly fair-use limit on AI cost: Pro $7.50, Max $20, Ultra $42, Studio $85. Using every message on your plan at typical sizes stays under it; very large messages and heavy research use it faster. Every limit, explained.

Grok, job by job

Its prompts passed on each of our 10 jobs, against the other 14 models in llmwise.

Coding
5 of 5 passed; no model of the 15 passed more.
Writing
3 of 5 passed; 10 of the other 14 models passed more.
Math
5 of 5 passed; no model of the 15 passed more.
Summarization
5 of 5 passed; no model of the 15 passed more.
Data analysis
5 of 5 passed; no model of the 15 passed more.
Customer support
4 of 5 passed; 5 of the other 14 models passed more.
Translation
5 of 5 passed; no model of the 15 passed more.
SQL
5 of 5 passed; no model of the 15 passed more.
RAG and answering from documents
5 of 5 passed; no model of the 15 passed more.
Agents and tool use
5 of 5 passed; no model of the 15 passed more.

Grok on one prompt, side by side

The same everyday writing prompt, “Rewrite corporate jargon in plain words”, sent to Grok 4.7, Claude Sonnet 5, and GPT-6 Luna: Grok 4.7 failed, Claude Sonnet 5 passed, and GPT-6 Luna passed.

The prompt: Rewrite corporate jargon in plain words (everyday)

Rewrite this for a general audience in at most 90 words, keeping every fact:

"Leveraging our cross-functional synergies, the Q3 initiative operationalized a customer-centric paradigm shift, yielding a 12% uplift in retention KPIs and a 30-basis-point reduction in churn velocity across the enterprise segment, while our omnichannel touchpoints were right-sized to optimize bandwidth."

Grok 4.7

Failed: Graded 3.7 of 5 on average (lowest 3).

In the third quarter, teams from different departments worked together on an initiative that put a stronger customer focus into practice. Retention measures rose 12%, and the speed at which enterprise customers left fell by 30 basis points. We also resized customer contact points across channels so they used available capacity more efficiently.

1,657 tokens in, 1,631 out (1,571 of them reasoning) · 19.3 s · $0.0088 · 1 message on Pro · answered by x-ai/grok-4.7 via xAI · September 27, 2026

Claude Sonnet 5

Passed: Graded 4.7 of 5 on average (lowest 4).

In Q3, teams worked together to focus more on customers' needs. This effort increased customer retention by 12% and reduced the rate of customer loss (churn) by 0.3 percentage points among large business clients. The company also adjusted the number of customer contact channels (like phone, email, and chat) to better manage workload and resources.

597 tokens in, 105 out · 2.7 s · $0.0022 · 1 message on Pro · answered by anthropic/claude-sonnet-5 via Claude Platform on AWS · September 27, 2026

GPT-6 Luna

Passed: Graded 4.7 of 5 on average (lowest 4).

In Q3, teams across the company worked together to focus more on customers. Retention measures improved by 12%, and the rate of customer loss fell by 0.3 percentage points in the enterprise segment. The company also adjusted its customer contact channels to make better use of available capacity.

417 tokens in, 124 out (59 of them reasoning) · 2.4 s · $0.0001 · 1 message on Pro · answered by openai/gpt-6-luna via OpenAI · September 27, 2026

xAI's own app

llmwise isn't xAI's app. Grok, xAI's own, has a free tier too; in its words: “You will still have access to Grok's free tier limits on Chat and Voice (these are separate from your weekly usage limit and resets on their own schedule).” (xAI docs: Grok website and apps FAQ, checked September 28, 2026).

Where your messages go

Grok models are served only through OpenRouter, by endpoints that don't store or train on prompts. The Privacy Policy has the details.

More ways to chat

The other chat pages, each with its own models and test results.

Questions

Can I chat with Grok for free?

Yes, to try: Grok 4.7 is in the 5 free messages you get when you sign up, once and with no card. The free-message box on this page, when it shows, is answered by GPT-6 Luna, not by Grok.

Is this the official Grok app?

No. llmwise isn't made by xAI and isn't affiliated with it: it offers xAI's Grok models next to 6 other AI families, in one chat. xAI's own app has a free tier too; in its words: “You will still have access to Grok's free tier limits on Chat and Voice (these are separate from your weekly usage limit and resets on their own schedule).” (xAI docs: Grok website and apps FAQ, checked September 28, 2026).

Where do my Grok messages go?

Grok models are served only through OpenRouter, by endpoints that don't store or train on prompts.

Claude, GPT, Gemini, DeepSeek, Grok, Kimi, and GLM, in one chat.

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