🤖 GPT-5.4 leak points to massive context window and new reasoning mode

Reports say OpenAI’s upcoming GPT-5.4 could bring a context window of up to 2M tokens along with persistent memory. That would allow the model to work with large codebases and long document sets without constant re-prompting.

The model is also expected to support full-resolution image processing for PNG, JPEG, and WebP files. That matters for dense screenshots, technical diagrams, UI layouts, and documents with small text where downscaling usually loses information.

Another addition is a new speed-priority tier plus an “extreme” reasoning mode. This mode reportedly allows the model to spend more compute on difficult tasks, aimed at research workflows and long multi-step jobs.

Mentions of GPT-5.4 briefly appeared in pull requests inside the public Codex repository before being removed. Prediction markets currently assign a 55% chance of release before April 2026 and 74% before June.

📊 @tech