The whole hunk
from line 1600, old and new numbered
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lines
from line 1600
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16011601 minimum: 0
16021602
1603 - `model: Model`
1603 - `model: Model or null`
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16051605 The model that will complete your prompt.
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16991699 Token usage for the fallback-model attempt of a server-side fallback request.
17001700
1701 Produced in place of a `message` entry for whichever hop served the
1702 response. A declined hop produces the existing `message` entry. Whether
1703 a fallback model served the response is signalled by the presence of this
1704 entry in `usage.iterations`.
1701 The terminal entry of a fallback-served turn: when a fallback hop's
1702 output is the returned message, the entry for the iteration that
1703 completed it carries this type in place of `message`. A declined hop
1704 and the serving hop's earlier tool-loop iterations produce `message`
1705 entries. Whether a fallback model served the response is signalled by
1706 the presence of this entry in `usage.iterations`.
17051707
17061708 - `type: "fallback_message"`
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