GPT-5.6 Terra vs Qwen3.7 Maxfor coding

```python
import re

_DURATION_RE = re.compile(r"(?:(\d+)h)?(?:(\d+)m)?(?:(\d+)s)?")

def parse_duration(s):
    """Convert a duration like '1h30m' into total seconds."""
    if not isinstance(s, str):
        raise ValueError("Duration must be a string")

    match = _DURATION_RE.fullmatch(s)
    if not match or not any(match.groups()):
        raise ValueError(f"Malformed duration: {s!r}")

    hours, minutes, seconds = (
        int(value) if value is not None else 0
        for value in match.groups()
    )

    return hours * 3600 + minute…

```python
import re

def parse_duration(s: str) -> int:
    """
    Converts a duration string (e.g., '1h30m', '45s', '1h2m3s') into total seconds.
    Raises ValueError on malformed inputs.
    """
    if not isinstance(s, str):
        raise ValueError(f"Expected a string, got {type(s).__name__}")
        
    # Regex explanation:
    # ^             : Start of string
    # (?:(\d+)h)?   : Optional non-capturing group for hours, capturing the digits
    # (?:(\d+)m)?   : Optional non-capturing group for minutes, capturing the digits
    # (?:…