Users can now pick any model from the full catalog directly in the Chat
tab using optgroups by provider (OpenAI, Google, Meta, Cohere, xAI),
without needing to pre-configure it in GenAI Config. OCI credentials,
region, and compartment auto-fill from the selected credential.
A collapsible parameters panel (temperature, max_tokens, top_p, top_k,
frequency/presence penalty) is available via the gear icon.
Saved GenAI configs still appear at the top of the dropdown as presets.
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