pub fn parse_model_string(s: &str) -> (Option<&str>, &str)Expand description
Parse a model string into (provider, model).
Supports:
provider/model→ (provider,model)- nested provider namespaces like
openai-codex/gpt-5.4 - OpenRouter-style paths like
openrouter/openai/gpt-5-codex
For three-or-more path segments, the first segment is the provider and the remainder is the model ID.