Three independent sources captured GPT-5.5 from every angle simultaneously: builder euphoria, toolchain adoption, and a structural reliability alarm.
OpenAI's GPT-5.5 arrives six weeks after 5.4 with a 7-point Terminal-Bench gain, doubled pricing, and cyber/bio safety classifications at HIGH.
OpenAI and Anthropic's April 2026 releases moved reasoning upstream of pixels, HTML, and OS automation—rewriting every execution primitive in a single week.
ACP (Agent Client Protocol) gains momentum: Zed's Codex ACP adapter and DeepChat's native ACP integration signal a second standard is consolidating alongside MCP.
OpenAI publishes openai/skills — its first public commitment to the Agent Skills open standard shared with Google Stitch and Anthropic Claude Code.
OpenAI's Chronicle research preview (April 20) captures your screen periodically to build ambient memory that makes Codex smarter over time — not available in EU/UK/CH.
OpenAI launches GPT-5.5 in ChatGPT and Codex with $5/$30 per-million token pricing, 1M context, and major token efficiency gains.
OpenAI and NVIDIA piloted a whole-company Codex rollout, and OpenAI is now inviting other enterprises to adopt the same all-employee model.
GPT-5.5 scores 2.5× better intelligence-per-token than 5.4, surpasses the human baseline on OS World, and expands Codex into a full desktop agent.
OpenAI upgrades Codex with parallel background computer-use agents, an in-app click-to-comment browser, native image gen, and a 90+ plugin marketplace.
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