← ChatGPT & Codex changelog

OpenAI API — August, 2026

Significant performance enhancements include Ultrafast mode for GPT-5.6 Sol, delivering up to 14x faster processing for select customers, and Fast mode long-context support for extended prompts across several GPT-5.6 models. Daybreak now features Blue and Red access tiers, providing specialized models for defensive security, vulnerability discovery, exploit validation, and red teaming engagements. Further improvements include API key filtering in usage dashboards for better cost analysis and regular updates to the chat-latest model snapshot, benefiting developers and security professionals alike.

Added

  • Announced Ultrafast mode, a new API service tier for GPT-5.6 Sol that runs up to 14x faster than Standard processing. Available in limited preview to select customers. Sign up to receive updates on Ultrafast mode here.

Changed

  • Start with Daybreak Blue for most defensive security work. It provides access to general-purpose models such as GPT-5.6 Sol for vulnerability discovery, secure code review, detection engineering, incident response, malware analysis, and patch validation. Read more here.
  • Daybreak Red provides separately approved access to purpose-trained models such as GPT-5.6 Cyber for authorized vulnerability reproduction, exploit validation, penetration testing, red teaming, and complex system analysis.
  • These models require separate approval and provisioning. You can apply to join the Daybreak program here. More details on pricing here.
  • Updated the chat-latest snapshot, which points to the latest model available in ChatGPT for Plus and Pro users. We recommend leveraging GPT-5.6 Sol for production API usage, but feel free to use this model to test the latest improvements for chat use cases. The underlying model snapshot will be regularly updated. Read more here.
  • Fast mode now supports long-context requests for GPT-5.6 Sol, GPT-5.6 Terra, and GPT-5.6 Luna. As of today, long-context prompts exceeding 272K tokens can run in Fast mode, delivering speeds up to 2.5× faster than the Standard tier. See pricing details.
  • Customers can now filter and group data by API key in the Usage and Costs dashboards. The Usage API and Costs API also support the API key dimension for programmatic reporting and analysis.

Fixed

  • Daybreak now offers two access tiers for approved defenders: Daybreak Blue and Daybreak Red. Use them to move from security findings to validated fixes in explicitly authorized engagements.