Tested prompt · Coding

Turn a title into a URL slug: every AI model's reply, tested

We sent this everyday coding prompt to all 20 models in llmwise, the same way the app sends a message, and checked every reply the same way. Here's each one as it came, with whether it passed, what it cost and how long it took.

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Based on 20 of our test runs on October 15, 2026, through OpenRouter with the app's own prompt and settings. Updated October 15, 2026.

Short answer

All 20 models passed this coding prompt's check (tests). The cheapest reply that passed was GLM 5.3 Flash's, at $0.000067; the fastest, GLM 5.3's in 0.4 s. The dearest reply, Claude Fable 5.1's, cost 248 times as much ($0.0167).

The prompt, as sent, and its check

Checked by tests, the same way for every model.

Turn a title into a URL slug (everyday)

Write a JavaScript function slugify(title) that turns a title into a URL slug:
- lowercase;
- letters with accents become the plain letter (é → e, ñ → n, ü → u);
- every run of characters that isn't a–z or 0–9 becomes a single hyphen;
- no hyphen at the start or the end.
For example, slugify("Hello, World!") returns "hello-world" and slugify("  Crème brûlée: 3 ways ") returns "creme-brulee-3-ways".
Reply with the whole function in one ```javascript code block: plain JavaScript for Node.js 22, no imports, no TypeScript.

The reply's slugify runs against these 7 tests; it passes when all of them do.

slugify("Hello, World!")  // → "hello-world"
slugify("  Crème brûlée: 3 ways ")  // → "creme-brulee-3-ways"
slugify("Ångström & Peña")  // → "angstrom-pena"
slugify("---Already--slugged---")  // → "already-slugged"
slugify("C++ vs. C#")  // → "c-vs-c"
slugify("2026: Q4 Plan")  // → "2026-q4-plan"
slugify("")  // → ""

Exactly what this prompt's replies are checked against, with every other prompt of our test runs.

Every model's result

All 20 models on this prompt, in catalog order.

Every model's reply to “Turn a title into a URL slug”
Model	Result	Cost	Time	Reply
Claude Fable 5.1Anthropic	Passed: All 7 tests passed.	$0.0167	5.5 s	170 tokens
Claude Opus 5.5Anthropic	Passed: All 7 tests passed.	$0.0055	3.1 s	112 tokens
Claude Sonnet 5.5Anthropic	Passed: All 7 tests passed.	$0.0028	1.8 s	112 tokens
Claude Sonnet 5Anthropic	Passed: All 7 tests passed.	$0.0024	2.3 s	109 tokens
Claude Haiku 5.5Anthropic	Passed: All 7 tests passed.	$0.00014	1.5 s	112 tokens
Claude Haiku 4.5Anthropic	Passed: All 7 tests passed.	$0.00096	1.5 s	86 tokens
GPT-6 AstraOpenAI	Passed: All 7 tests passed.	$0.0084	2.1 s	71 tokens
GPT-6.1 SolOpenAI	Passed: All 7 tests passed.	$0.00084	1.7 s	71 tokens
GPT-6 SolOpenAI	Passed: All 7 tests passed.	$0.0028	3.3 s	71 tokens
GPT-6 LunaOpenAI	Passed: All 7 tests passed.	$0.000085	2.3 s	74 tokens
Gemini 4 ArgonGoogle	Passed: All 7 tests passed.	$0.0012	2.9 s	88 tokens
Gemini 3.1 Pro (preview)Google	Passed: All 7 tests passed.	$0.0056	6.0 s	81 tokens
Gemini 3.8 FlashGoogle	Passed: All 7 tests passed.	$0.00087	4.2 s	128 tokens
DeepSeek V4.1 FlashDeepSeek	Passed: All 7 tests passed.	$0.00041	1.3 s	253 tokens
DeepSeek V4 ProDeepSeek	Passed: All 7 tests passed.	$0.0015	3.9 s	77 tokens
Grok 4.7xAI	Passed: All 7 tests passed.	$0.0078	14.3 s	73 tokens
Kimi K3Moonshot	Passed: All 7 tests passed.	$0.0035	2.6 s	81 tokens
GLM 5.3Z.ai	Passed: All 7 tests passed.	$0.0010	0.4 s	74 tokens
GLM 5.3 FlashZ.ai	Passed: All 7 tests passed.	$0.000067	2.6 s	75 tokens
Mistral Large 4Mistral	Passed: All 7 tests passed.	$0.0022	7.0 s	177 tokens

Cost: what OpenRouter charged us for the reply. Time: from sending to the whole reply. Reply: its length in tokens, thinking not counted. In llmwise you pay per message, not per token: each of these replies counted as one message on Pro.

Every reply

Every reply passed: here they are from the cheapest up.

GLM 5.3 Flash

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  const normalized = title.normalize("NFD").replace(/[\u0300-\u036f]/g, "");
  return normalized
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");
}
```

499 tokens in, 75 out · 2.6 s · $0.0001 · 1 message on Pro · answered by z-ai/glm-5.3-flash via GMICloud · September 27, 2026

GPT-6 Luna

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .toLowerCase()
    .normalize("NFD")
    .replace(/[\u0300-\u036f]/g, "")
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-|-$/g, "");
}
```

483 tokens in, 74 out · 2.3 s · $0.0001 · 1 message on Pro · answered by openai/gpt-6-luna via OpenAI · September 27, 2026

Claude Haiku 5.5

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return String(title)
    .normalize("NFD")
    .replace(/[\u0300-\u036f]/g, "")
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");
}
```

672 tokens in, 112 out · 1.5 s · $0.0001 · 1 message on Pro · answered by anthropic/claude-haiku-5.5 via Anthropic · October 7, 2026

DeepSeek V4.1 Flash

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .normalize('NFD')            // split accented letters into base + combining mark
    .replace(/[\u0300-\u036f]/g, '') // drop the combining marks (é → e, ñ → n, ü → u)
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')  // every run of anything else becomes one hyphen
    .replace(/^-+|-+$/g, '');     // trim leading/trailing hyphens
}
```

Note: `normalize('NFD')` handles the accents, but a few letters don't decompose that way (`ø`, `ß`, `đ`, `æ`). If you need those, add an explicit map before the cleanup:

```javascript
const SPECIAL = { ø: 'o', ß: 'ss', đ: 'd', æ: 'ae', œ: 'oe', þ: 'th', ł: 'l' };
```

with `title.replace(/[øßđæœþł]/gi, c => SPECIAL[c.toLowerCase()])` inserted before `.toLowerCase()`.

522 tokens in, 276 out (23 of them reasoning) · 1.3 s · $0.0004 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via Together · October 7, 2026

GPT-6.1 Sol

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .toLowerCase()
    .normalize("NFD")
    .replace(/\p{M}/gu, "")
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");
}
```

485 tokens in, 71 out · 1.7 s · $0.0008 · 1 message on Pro · answered by openai/gpt-6.1-sol via OpenAI · September 29, 2026

Gemini 3.8 Flash

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .normalize('NFD')                  // Decompose combined graphemes into base letters + diacritical marks
    .replace(/[\u0300-\u036f]/g, '')   // Remove all diacritical marks
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')       // Replace runs of non-alphanumeric characters with a single hyphen
    .replace(/^-+|-+$/g, '');          // Trim leading and trailing hyphens
}
```

514 tokens in, 128 out · 4.2 s · $0.0009 · 1 message on Pro · answered by google/gemini-3.8-flash via Google · September 27, 2026

Claude Haiku 4.5

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .toLowerCase()
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '')
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-+|-+$/g, '');
}
```

526 tokens in, 86 out · 1.5 s · $0.0010 · 1 message on Pro · answered by anthropic/claude-haiku-4.5 via Amazon Bedrock · September 27, 2026

GLM 5.3

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .normalize("NFD")
    .replace(/[\u0300-\u036f]/g, "")
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");
}
```

498 tokens in, 74 out · 0.4 s · $0.0010 · 1 message on Pro · answered by z-ai/glm-5.3 via Modal · September 27, 2026

Gemini 4 Argon

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return String(title)
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '')
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-|-$/g, '');
}
```

736 tokens in, 88 out · 2.9 s · $0.0012 · 1 message on Pro · answered by google/gemini-4-argon via Google AI Studio · October 15, 2026

DeepSeek V4 Pro

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return String(title)
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '')
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-+|-+$/g, '');
}
```

494 tokens in, 321 out (244 of them reasoning) · 3.9 s · $0.0015 · 1 message on Pro · answered by deepseek/deepseek-v4-pro-0813 via Wafer · October 7, 2026

Mistral Large 4

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .normalize('NFD')                    // split accented letters into base + combining mark
    .replace(/[\u0300-\u036f]/g, '')    // strip the combining marks (é → e, ñ → n, ü → u)
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')        // every run of non-alphanumerics becomes one hyphen
    .replace(/^-+|-+$/g, '');           // trim hyphens from start and end
}
```

491 tokens in, 871 out (694 of them reasoning) · 7.0 s · $0.0022 · 1 message on Pro · answered by mistralai/mistral-large-4-0 via Mistral · October 9, 2026

Claude Sonnet 5

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '')
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-+|-+$/g, '');
}
```

669 tokens in, 109 out · 2.3 s · $0.0024 · 1 message on Pro · answered by anthropic/claude-sonnet-5 via Claude Platform on AWS · September 27, 2026

Claude Sonnet 5.5

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return String(title)
    .normalize("NFD")
    .replace(/[\u0300-\u036f]/g, "")
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");
}
```

673 tokens in, 112 out · 1.8 s · $0.0028 · 1 message on Pro · answered by anthropic/claude-sonnet-5.5 via Anthropic · September 28, 2026

GPT-6 Sol

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .normalize("NFD")
    .replace(/\p{M}/gu, "")
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-|-$/g, "");
}
```

483 tokens in, 185 out (114 of them reasoning) · 3.3 s · $0.0028 · 1 message on Pro · answered by openai/gpt-6-sol via OpenAI · September 27, 2026

Kimi K3

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .normalize("NFD")
    .replace(/[̀-ͯ]/g, "")
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");
}
```

574 tokens in, 97 out (16 of them reasoning) · 2.6 s · $0.0035 · 1 message on Pro · answered by moonshotai/kimi-k3 via Fireworks · September 27, 2026

Claude Opus 5.5

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return String(title)
    .normalize("NFD")
    .replace(/[\u0300-\u036f]/g, "")
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");
}
```

671 tokens in, 112 out · 3.1 s · $0.0055 · 1 message on Pro · answered by anthropic/claude-opus-5.5 via Claude Platform on AWS · September 27, 2026

Gemini 3.1 Pro

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '')
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-+|-+$/g, '');
}
```

514 tokens in, 380 out (299 of them reasoning) · 6.0 s · $0.0056 · 1 message on Pro · answered by google/gemini-3.1-pro-preview via Google · September 27, 2026

Grok 4.7

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .normalize("NFD")
    .replace(/\p{M}/gu, "")
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");
}
```

1,720 tokens in, 1,012 out (939 of them reasoning) · 14.3 s · $0.0078 · 1 message on Pro · answered by x-ai/grok-4.7 via xAI · October 2, 2026

GPT-6 Astra

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return title
    .toLowerCase()
    .normalize("NFD")
    .replace(/\p{M}/gu, "")
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");
}
```

483 tokens in, 71 out · 2.1 s · $0.0084 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI · September 27, 2026

Claude Fable 5.1

Passed: All 7 tests passed.

```javascript
function slugify(title) {
  return String(title)
    .normalize("NFD")                 // split accented letters into base + combining marks
    .replace(/[\u0300-\u036f]/g, "")  // strip the combining marks
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")      // any run of non-alphanumerics -> single hyphen
    .replace(/^-+|-+$/g, "");         // trim leading/trailing hyphens
}
```

671 tokens in, 170 out · 5.5 s · $0.0167 · 1 message on Pro · answered by anthropic/claude-fable-5.1 via Anthropic · September 27, 2026

More coding prompts

The other coding prompts, each with every model's reply, and the results across all five.

Questions

Which AI does best on “Turn a title into a URL slug”?

What does a reply to “Turn a title into a URL slug” cost?

Through the models' APIs, what OpenRouter charged us ran from $0.000067 (GLM 5.3 Flash) to $0.0167 (Claude Fable 5.1) for this prompt. In llmwise you don't pay by the token: a reply like these counts as one message on Pro, whichever model answers.

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

See what a message costs before you send it. Free is 5 messages to try; sign in with an email link, no password or card.

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