Parse a duration like “1h 30m”: every AI model's reply, tested

Write a JavaScript function parseDuration(text) that returns the number of seconds in a duration written like "1h 30m", "45s", "2h", "1h5m10s" or "90m".
The parts are h, m and s, each at most once and in that order, with optional spaces between them and around the whole. Return null for anything else, such as "", "1x", "5m 1h" or "h".
Reply with the whole function in one ```javascript code block: plain JavaScript for Node.js 22, no imports, no TypeScript.

parseDuration("1h 30m")  // → 5400
parseDuration("45s")  // → 45
parseDuration("2h")  // → 7200
parseDuration("1h5m10s")  // → 3910
parseDuration("90m")  // → 5400
parseDuration(" 10m 5s ")  // → 605
parseDuration("")  // → null
parseDuration("1x")  // → null
parseDuration("5m 1h")  // → null
parseDuration("1h 1h")  // → null

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

1. GPT-6 Luna

   Passed: All 10 tests passed.

   ```javascript
   function parseDuration(text) {
     if (typeof text !== "string") return null;
   
     const match = text.match(/^\s*(?:(\d+)h)?\s*(?:(\d+)m)?\s*(?:(\d+)s)?\s*$/);
     if (!match || !match[1] && !match[2] && !match[3]) return null;
   
     return Number(match[1] || 0) * 3600
       + Number(match[2] || 0) * 60
       + Number(match[3] || 0);
   }
   ```

   468 tokens in, 407 out (269 of them reasoning) · 4.6 s · $0.0003 · 1 message on Pro · answered by openai/gpt-6-luna via OpenAI · September 27, 2026

2. GLM 5.3 Flash

   Passed: All 10 tests passed.

   ```javascript
   function parseDuration(text) {
     if (typeof text !== "string") return null;
     const m = text.match(/^\s*(?:(\d+)h\s*)?(?:(\d+)m\s*)?(?:(\d+)s\s*)?$/);
     if (!m || (m[1] === undefined && m[2] === undefined && m[3] === undefined)) {
       return null;
     }
     const [h = 0, mi = 0, s = 0] = m.slice(1).map((v) => (v === undefined ? 0 : Number(v)));
     return h * 3600 + mi * 60 + s;
   }
   ```

   481 tokens in, 470 out (320 of them reasoning) · 8.2 s · $0.0003 · 1 message on Pro · answered by z-ai/glm-5.3-flash via Morph · September 27, 2026

3. DeepSeek V4.1 Flash

   Passed: All 10 tests passed.

   ```javascript
   function parseDuration(text) {
     if (typeof text !== "string") return null;
   
     const match = /^\s*(?:(\d+)h)?\s*(?:(\d+)m)?\s*(?:(\d+)s)?\s*$/.exec(text);
     if (!match) return null;
   
     const [, h, m, s] = match;
     // Reject empty / whitespace-only input (no part present).
     if (h === undefined && m === undefined && s === undefined) return null;
   
     return Number(h ?? 0) * 3600 + Number(m ?? 0) * 60 + Number(s ?? 0);
   }
   ```

   505 tokens in, 1,128 out (982 of them reasoning) · 7.8 s · $0.0008 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via StreamLake · September 27, 2026

4. Gemini 3.8 Flash

   Passed: All 10 tests passed.

   ```javascript
   function parseDuration(text) {
     if (typeof text !== 'string') return null;
     const match = text.trim().match(/^(?:(\d+)h)?\s*(?:(\d+)m)?\s*(?:(\d+)s)?$/);
     if (!match || (!match[1] && !match[2] && !match[3])) {
       return null;
     }
   
     const hours = match[1] ? Number(match[1]) : 0;
     const minutes = match[2] ? Number(match[2]) : 0;
     const seconds = match[3] ? Number(match[3]) : 0;
   
     return hours * 3600 + minutes * 60 + seconds;
   }
   ```

   498 tokens in, 176 out · 2.3 s · $0.0010 · 1 message on Pro · answered by google/gemini-3.8-flash via Google · September 27, 2026

5. GLM 5.3

   Passed: All 10 tests passed.

   ```javascript
   function parseDuration(text) {
     if (typeof text !== "string") return null;
     const match = text.trim().match(/^(?:(\d+)h)?\s*(?:(\d+)m)?\s*(?:(\d+)s)?$/);
     if (!match || match[0].trim() === "") return null;
     const h = match[1] ? parseInt(match[1], 10) * 3600 : 0;
     const m = match[2] ? parseInt(match[2], 10) * 60 : 0;
     const s = match[3] ? parseInt(match[3], 10) : 0;
     return h + m + s;
   }
   ```

   503 tokens in, 161 out (4 of them reasoning) · 1.1 s · $0.0014 · 1 message on Pro · answered by z-ai/glm-5.3 via Wafer · September 27, 2026

6. Claude Haiku 4.5

   Passed: All 10 tests passed.

   ```javascript
   function parseDuration(text) {
     // Trim whitespace from the input
     const trimmed = text.trim();
     
     // Empty string is invalid
     if (trimmed === '') {
       return null;
     }
     
     // Regular expression to match valid duration format
     // Optional: number+h, then optional: number+m, then optional: number+s
     // With optional spaces between components
     const regex = /^\s*(\d+h)?\s*(\d+m)?\s*(\d+s)?\s*$/;
     
     const match = trimmed.match(regex);
     
     // No match means invalid format
     if (!match) {
       return null;
     }
     
     // At least one component must be present
     if (!match[1] && !match[2] && !match[3]) {
       return null;
     }
     
     let seconds = 0;
     
     // Parse hours
     if (match[1]) {
       seconds += parseInt(match[1]) * 3600;
     }
     
     // Parse minutes
     if (match[2]) {
       seconds += parseInt(match[2]) * 60;
     }
     
     // Parse seconds
     if (match[3]) {
       seconds += parseInt(match[3]);
     }
     
     return seconds;
   }
   ```

   495 tokens in, 334 out · 2.3 s · $0.0022 · 1 message on Pro · answered by anthropic/claude-haiku-4.5 via Amazon Bedrock · September 27, 2026

7. DeepSeek V4 Pro

   Passed: All 10 tests passed.

   ```javascript
   function parseDuration(text) {
     const match = /^\s*(?:(\d+)h)?\s*(?:(\d+)m)?\s*(?:(\d+)s)?\s*$/.exec(text);
     if (!match || (!match[1] && !match[2] && !match[3])) return null;
     return (
       Number(match[1] || 0) * 3600 +
       Number(match[2] || 0) * 60 +
       Number(match[3] || 0)
     );
   }
   ```

   477 tokens in, 1,544 out (1,420 of them reasoning) · 20.1 s · $0.0030 · 1 message on Pro · answered by deepseek/deepseek-v4-pro-0813 via Alibaba · September 27, 2026

8. Claude Sonnet 5.5

   Passed: All 10 tests passed.

   ```javascript
   function parseDuration(text) {
     if (typeof text !== "string") return null;
     const match = /^\s*(?:(\d+)\s*h)?\s*(?:(\d+)\s*m)?\s*(?:(\d+)\s*s)?\s*$/.exec(text);
     if (!match) return null;
     const [, h, m, s] = match;
     if (h === undefined && m === undefined && s === undefined) return null;
     return (h ? Number(h) * 3600 : 0) + (m ? Number(m) * 60 : 0) + (s ? Number(s) : 0);
   }
   ```

   628 tokens in, 208 out · 2.0 s · $0.0036 · 1 message on Pro · answered by anthropic/claude-sonnet-5.5 via Anthropic · September 28, 2026

9. Claude Sonnet 5

   Passed: All 10 tests passed.

   ```javascript
   function parseDuration(text) {
     if (typeof text !== 'string') return null;
   
     const match = text.match(/^\s*(?:(\d+)h)?\s*(?:(\d+)m)?\s*(?:(\d+)s)?\s*$/);
     if (!match) return null;
   
     const [, h, m, s] = match;
     if (h === undefined && m === undefined && s === undefined) return null;
   
     const hours = h ? parseInt(h, 10) : 0;
     const minutes = m ? parseInt(m, 10) : 0;
     const seconds = s ? parseInt(s, 10) : 0;
   
     return hours * 3600 + minutes * 60 + seconds;
   }
   ```

   624 tokens in, 240 out · 2.6 s · $0.0036 · 1 message on Pro · answered by anthropic/claude-sonnet-5 via Claude Platform on AWS · September 27, 2026

10. GPT-6 Sol

    Passed: All 10 tests passed.

    ```javascript
    function parseDuration(text) {
      if (typeof text !== "string") return null;
    
      const match = /^ *(?:(\d+)h)? *(?:(\d+)m)? *(?:(\d+)s)? *$/.exec(text);
      if (!match || (match[1] === undefined && match[2] === undefined && match[3] === undefined)) {
        return null;
      }
    
      return Number(match[1] || 0) * 3600
        + Number(match[2] || 0) * 60
        + Number(match[3] || 0);
    }
    ```

    468 tokens in, 327 out (187 of them reasoning) · 4.8 s · $0.0042 · 1 message on Pro · answered by openai/gpt-6-sol via OpenAI · September 27, 2026

11. Kimi K3

    Passed: All 10 tests passed.

    ```javascript
    function parseDuration(text) {
      if (typeof text !== "string") return null;
      const match = /^\s*(?:(\d+)h)?\s*(?:(\d+)m)?\s*(?:(\d+)s)?\s*$/.exec(text);
      if (!match) return null;
      const [, h, m, s] = match;
      if (h === undefined && m === undefined && s === undefined) return null;
      return (h ? Number(h) * 3600 : 0) + (m ? Number(m) * 60 : 0) + (s ? Number(s) : 0);
    }
    ```
    
    The regex enforces the `h` → `m` → `s` order with each unit at most once and allows optional whitespace between parts and around the whole string. Inputs like `""`, `"h"`, `"1x"`, or `"5m 1h"` fail the match (or the "at least one part" check) and return `null`.

    555 tokens in, 325 out (93 of them reasoning) · 7.1 s · $0.0063 · 1 message on Pro · answered by moonshotai/kimi-k3 via Together · September 27, 2026

12. Claude Opus 5.5

    Passed: All 10 tests passed.

    ```javascript
    function parseDuration(text) {
      if (typeof text !== "string") return null;
    
      const match = /^\s*(?:(\d+)h)?\s*(?:(\d+)m)?\s*(?:(\d+)s)?\s*$/.exec(text);
      if (!match) return null;
    
      const [, h, m, s] = match;
      if (h === undefined && m === undefined && s === undefined) return null;
    
      return (
        (h !== undefined ? Number(h) * 3600 : 0) +
        (m !== undefined ? Number(m) * 60 : 0) +
        (s !== undefined ? Number(s) : 0)
      );
    }
    ```

    626 tokens in, 406 out (182 of them reasoning) · 7.2 s · $0.0112 · 1 message on Pro · answered by anthropic/claude-opus-5.5 via Claude Platform on AWS · September 27, 2026

13. Grok 4.7

    Passed: All 10 tests passed.

    ```javascript
    function parseDuration(text) {
      if (typeof text !== "string") return null;
      const match = text.match(/^\s*(?:(\d+)h\s*)?(?:(\d+)m\s*)?(?:(\d+)s)?\s*$/);
      if (!match || (match[1] === undefined && match[2] === undefined && match[3] === undefined)) {
        return null;
      }
      const hours = match[1] === undefined ? 0 : Number(match[1]);
      const minutes = match[2] === undefined ? 0 : Number(match[2]);
      const seconds = match[3] === undefined ? 0 : Number(match[3]);
      return hours * 3600 + minutes * 60 + seconds;
    }
    ```

    1,705 tokens in, 2,862 out (2,687 of them reasoning) · 25.3 s · $0.0151 · 1 message on Pro · answered by x-ai/grok-4.7 via xAI · September 27, 2026

14. Gemini 3.1 Pro

    Passed: All 10 tests passed.

    ```javascript
    function parseDuration(text) {
      if (typeof text !== 'string' || text.trim() === '') {
        return null;
      }
    
      const regex = /^\s*(?:(\d+)\s*h)?\s*(?:(\d+)\s*m)?\s*(?:(\d+)\s*s)?\s*$/;
      const match = text.match(regex);
    
      if (!match) {
        return null;
      }
    
      const hours = match[1] ? parseInt(match[1], 10) : 0;
      const minutes = match[2] ? parseInt(match[2], 10) : 0;
      const seconds = match[3] ? parseInt(match[3], 10) : 0;
    
      if (hours === 0 && minutes === 0 && seconds === 0 && !match[1] && !match[2] && !match[3]) {
        return null;
      }
    
      return (hours * 3600) + (minutes * 60) + seconds;
    }
    ```

    498 tokens in, 1,348 out (1,095 of them reasoning) · 10.3 s · $0.0172 · 1 message on Pro · answered by google/gemini-3.1-pro-preview via Google · September 27, 2026

15. Claude Fable 5.1

    Passed: All 10 tests passed.

    ```javascript
    function parseDuration(text) {
      if (typeof text !== 'string') return null;
      const match = /^\s*(?:(\d+)h)?\s*(?:(\d+)m)?\s*(?:(\d+)s)?\s*$/.exec(text);
      if (!match) return null;
      const [, h, m, s] = match;
      if (h === undefined && m === undefined && s === undefined) return null;
      return (Number(h ?? 0) * 3600) + (Number(m ?? 0) * 60) + Number(s ?? 0);
    }
    ```

    626 tokens in, 193 out · 4.7 s · $0.0173 · 1 message on Pro · answered by anthropic/claude-fable-5.1 via Anthropic · September 27, 2026

16. GPT-6 Astra

    Passed: All 10 tests passed.

    ```javascript
    function parseDuration(text) {
      if (typeof text !== "string") return null;
    
      const match = /^\s*(?:(\d+)h\s*)?(?:(\d+)m\s*)?(?:(\d+)s\s*)?$/.exec(text);
      if (!match || (match[1] === undefined && match[2] === undefined && match[3] === undefined)) {
        return null;
      }
    
      return Number(match[1] ?? 0) * 3600
        + Number(match[2] ?? 0) * 60
        + Number(match[3] ?? 0);
    }
    ```

    468 tokens in, 377 out (234 of them reasoning) · 8.2 s · $0.0235 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI · September 27, 2026

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