Changelog

Model availability update for ChatGPT sign-in users. Removed older model versions (gpt-5.2-codex, gpt-5.1 variants). Preserved models: gpt-5.4, gpt-5.4-mini, and gpt-5.3-codex.

Plugin system launch. Installable bundles that package skills, app integrations, and MCP server configuration.

GPT-5.4 mini introduction — a fast, efficient model for lighter coding tasks providing 30% usage consumption relative to GPT-5.4.

Major Codex app update (v26.312) featuring customizable themes and revamped automations interface with local/worktree execution options.

GPT-5.4 announcement — the most capable and efficient frontier model with native computer-use capabilities and 1M context window support.

Codex app for Windows release with native PowerShell support and Windows sandbox integration.

Codex app launch for macOS with multithreading, worktree support, and voice dictation features. Double rate limits announced for Plus/Pro plans.

GPT-5.3-Codex-Spark research preview — designed for real-time coding, delivering more than 1000 tokens per second.

GPT-5.3-Codex release — most capable agentic coding model to date, running 25% faster for Codex users.

Web search enabled by default with cached and live mode options.

Team Config feature allowing shared configuration across repositories.

GPT-5.2-Codex API availability announcement.

Agent skills system introduction with folder-based standard (agentskills.io).

GPT-5.2-Codex release optimized for long-horizon work through context compaction.

Codex for Linear integration enabling task assignment via @Codex mentions.

GPT-5.1-Codex-Max frontier model launch with Extra High reasoning effort option.

GPT-5.1-Codex and GPT-5.1-Codex-Mini releases.

GPT-5-Codex-Mini introduction providing approximately 4x more usage than the standard version.

GPT-5-Codex model update improving file edits and reducing destructive actions.

On-demand credits availability for ChatGPT Plus/Pro users.

@Codex GitHub mentions support for issues and PRs.

General availability announcement with Slack integration, Codex SDK, and admin tools.

GPT-5-Codex API availability through Responses API.

GPT-5-Codex introduction — version of GPT-5 further optimized for agentic coding.