OpenAI DevDay 2026 recap: GPT-6 Astra, Codex and new developer toolsOpenAI DevDay 2026 recap: GPT-6 Astra, Codex and new developer toolsOpenAI made more than 20 announcements at its DevDay 2026 event. The recap page brings together GPT-6 Astra, ChatGPT, Codex, APIs, security and new tools for builders.29 SeptAI
