phax

    Model routing

    Multi-provider model routing

    PHAX can route phase execution through Claude Code, Mistral Vibe, or OpenAI Codex based on a user-editable global routing config (~/.phax/model-routing.json). The routing layer maps requested model IDs to stable model families and PHAX tiers, then selects the best available provider from providerPriority.

    phax agent models                              # print routing table + provider priority
phax agent resolve --model claude-sonnet-4-6 --effort medium [--json]
phax agent probe                               # check provider executable availability
phax agent setup mistral-vibe --dry-run        # preview Vibe alias installation
phax agent setup mistral-vibe --install-model-aliases  # install PHAX Vibe aliases

    The default providerPriority is ["mistral-vibe", "codex-cli", "claude-code"] (the spec ยง12 multi-provider table). On a clean install, mistral-vibe and codex-cli are enabled: false in the default provider config, so all phases run through Claude Code as before. Enabling them via phax agent setup providers (or editing ~/.phax/providers.json) activates the richer routing. See docs/model-routing.md for the full resolution pipeline, tier table, relationship semantics, and worked examples.