AI / Claude Sonnet5 Interview questions

What is the difference between migrating from Sonnet 4.6 versus from Sonnet 4.5 or earlier?

Migrating specifically from Sonnet 4.6 only requires handling the changes introduced with Sonnet 5 itself: adaptive thinking on by default, manual extended thinking rejected, non-default sampling parameters rejected, and the new tokenizer.

Migrating from Sonnet 4.5 or an earlier version requires applying those same Sonnet-5-specific changes plus an additional set of older breaking changes that were already introduced between Sonnet 4.5 and Sonnet 4.6 - specifically, assistant message prefilling being rejected and differences in how tool parameters are JSON-escaped.

This distinction matters because code still running on a pre-4.6 Sonnet version has more total ground to cover during migration than code already running on 4.6, even though both end up on the same Sonnet 5 model - the older codebase simply has a longer list of accumulated changes to work through.

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Migrating from Sonnet 4.6 alone requires handling: none of the changes at all

✗ Try again if not.

only the changes introduced specifically with Sonnet 5

✓ Correct! Well done.

every breaking change since Sonnet 3.5

✗ Try again if not.

Migrating from Sonnet 4.5 or earlier additionally requires handling: prefill rejection and tool-parameter JSON-escaping differences from the 4.5-to-4.6 transition

✓ Correct! Well done.

nothing extra beyond the Sonnet 5 changes

✗ Try again if not.

a completely different, unrelated set of changes with no overlap

✗ Try again if not.

More Related questions...

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