OpenAI has launched GPT-5.1-Codex-Max, a new coding model designed to enhance agentic tasks in software engineering. This model features improved speed, token efficiency, and the ability to manage long-running tasks by compacting context windows, positioning it as a more reliable coding partner for developers.

• GPT-5.1-Codex-Max is trained natively for agentic coding across multi-hour, multi-step tasks via "compaction," letting it clear context and keep working across millions of tokens rather than hitting a fixed window limit
• Positioned as faster and more token-efficient than prior Codex models while maintaining coherence over long-running sessions
• Marketed as a more reliable long-horizon coding partner for real-world software engineering workflows, not just short code completions