GPT-5.6 Luna vs GPT-5.6 Solfor coding

```python
import re


def parse_duration(s):
    """Convert a duration such as '1h30m' to seconds."""
    if not isinstance(s, str):
        raise ValueError("duration must be a string")

    match = re.fullmatch(
        r"(?:(\d+)h)?(?:(\d+)m)?(?:(\d+)s)?",
        s,
    )

    if match is None or not any(match.groups()):
        raise ValueError(f"malformed duration: {s!r}")

    hours, minutes, seconds = (
        int(value or 0) for value in match.groups()
    )
    return hours * 3600 + minutes * 60 + seconds


# Tests
assert parse_durat…

```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…