OpenAI says GPT-5.4 Thinking and Pro are rolling out gradually across ChatGPT, the API, and Codex. The company positions GPT-5.4 as a unified frontier model for professional work with stronger coding, tool use, and 1M-token context.
OpenAI said Codex Security is rolling out in research preview via Codex web. The company positioned it as a context-aware application security agent that reduces noise while surfacing higher-confidence findings and patches.
GitHub said on February 26, 2026 that Claude by Anthropic and OpenAI Codex are now available as coding agents for Copilot Business and Copilot Pro customers. The release brings multi-agent choice into github.com, GitHub Mobile, and VS Code without requiring an extra subscription.
OpenAI announced on X that Codex Security has entered research preview. The company positions it as an application security agent that can detect, validate, and patch complex vulnerabilities with more context and less noise.
OpenAI says GPT-5.4 Thinking is shipping in ChatGPT, with GPT-5.4 also live in the API and Codex and GPT-5.4 Pro available for harder tasks. The launch packages reasoning, coding, and native computer use into a single professional-work model with up to 1M tokens of context.
OpenAI has put Codex Security into research preview, extending its agent stack into repository scanning, bug reproduction, threat analysis, and remediation. The company says the system sharply reduced review noise and false positives in internal evaluations.
OpenAI Developers said on March 6, 2026 that Codex Security is now in research preview. The product connects to GitHub repositories, builds a threat model, validates potential issues in isolation, and proposes patches for human review.
OpenAI announced Codex for Open Source on March 6, 2026, pitching the program as practical support for maintainers who review code, manage large repositories, and handle security work. The program combines API credits, six months of ChatGPT Pro with Codex, and conditional Codex Security access for eligible projects.
OpenAI reposted a thread announcing Codex integration into Prism, positioning it as a single environment for writing, computation, analysis, and iteration. The update points to tighter workflows for research-oriented knowledge work.
OpenAIDevs said Codex now supports a /fast mode where GPT-5.4 runs 1.5x faster while keeping the same intelligence and reasoning profile. The update targets faster coding iteration and debugging loops for developer workflows.
OpenAI announced that GPT-5.4 Thinking and GPT-5.4 Pro are rolling out in ChatGPT, while GPT-5.4 is already available in the API and Codex. The launch positions GPT-5.4 as a unified frontier model for reasoning, coding, and agentic workflows.
OpenAI Developers posted that the Codex app is now available on Windows with a native agent sandbox and PowerShell-oriented developer environment support. The update extends Codex usage beyond previous desktop workflows and signals deeper Windows integration for agentic coding tasks.