Gemini 3.1 Pro Preview vs GPT-5.6 Solfor coding

```python
import re

def parse_duration(s):
    """
    Parses a duration string (e.g., '1h30m', '45s') and returns the total in seconds.
    Raises ValueError if the string is malformed.
    """
    if not isinstance(s, str):
        raise ValueError("Input must be a string")
        
    # Regex enforces the format and order (hours -> minutes -> seconds) with no spaces.
    # All groups are optional, but at least one must be present.
    pattern = r'^(?:(?P<hours>\d+)h)?(?:(?P<minutes>\d+)m)?(?:(?P<seconds>\d+)s)?$'
    match = re.match(patte…

```python
import re

_DURATION_PATTERN = re.compile(
    r"(?:(?P<hours>[0-9]+)h)?"
    r"(?:(?P<minutes>[0-9]+)m)?"
    r"(?:(?P<seconds>[0-9]+)s)?"
)


def parse_duration(s):
    if not isinstance(s, str) or not s:
        raise ValueError("Malformed duration")

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

    hours = int(match.group("hours") or 0)
    minutes = int(match.group("minutes") or 0)
    seconds = int(match.group("seconds") or 0)

    return hours * 3600 + minu…