pi v0.80.8: unified model runtime, xAI OAuth, and Grok 4.5

pi v0.80.8 was published on July 16, 2026, with a significant internal rework of how models and providers are managed.

A new ModelRuntime layer now centralizes model configuration, provider-owned /login flows, and dynamic provider catalogs. Instead of each provider handling authentication and model lists in its own way, there is one consistent mechanism — which is also what enables the /login sign-in flows that later releases build on.

Model catalogs now refresh live: the /model command refreshes configured providers in the background, and pi update --models forces an immediate refresh, so newly released models show up without waiting for a pi update.

The release also adds xAI device-code OAuth sign-in and support for Grok 4.5 via the Responses API, with low, medium, and high thinking levels.

Note for SDK users: this version contains breaking changes. The CreateAgentSessionOptions.authStorage and modelRegistry options were replaced — check the release notes before upgrading if you embed pi through its SDK.