GPT-5.4 Pro and Thinking are here!

[sps]

Buzzing since gpt-5.4 dropped. Wrote a companion post to highlight the details that matter when you start building with gpt-5.4

GPT-5.4 deep dive: pricing, context limits, and tool search explained

The announcement covers the headlines well. This is the companion post covering the specifics you’ll want to know before your first API call, so you’re not figuring them out mid-build. The 1M context window is opt-in (and worth understanding first) The 1M token context is real, but it’s an experimental feature you enable explicitly by configuring model_context_window and model_auto_compact_token_limit. Without those params, you’re on the standard 272K window. Requests that go beyond 27…