Amp Adds Plaid Speed for GPT-6 Astra Modes at 6x Speed and Cost

Amp now supports Plaid speed for modes that use GPT-6 Astra, using OpenAI's ultrafast tier to run inference up to 6× faster at 6× cost per token. Plaid works only with Amp-provided inference, not linked ChatGPT subscriptions, and subagents and non-Plaid inference fall back to fast or standard speed.