--- title: Codex's NEW A2A Communication & Crazy NEW UPDATES: You... description: Codex received a cluster of updates between August 22 and September 2026: the Astra model (GPT-6 Astra) launched September 3 with experimental context... canonical: https://daily.dev/posts/codex-s-new-a2a-communication-crazy-new-updates-you-don-t-know-about-these-secret-updates--lyoxqhhdj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Codex's NEW A2A Communication & Crazy NEW UPDATES: You don't know about these SECRET UPDATES! | daily.dev og:description: Codex received a cluster of updates between August 22 and September 2026: the Astra model (GPT-6 Astra) launched September 3 with experimental context... og:url: https://daily.dev/posts/codex-s-new-a2a-communication-crazy-new-updates-you-don-t-know-about-these-secret-updates--lyoxqhhdj og:image: https://api.daily.dev/og/posts/lyOXQhHDJ.png og:image:alt: Codex's NEW A2A Communication & Crazy NEW UPDATES: You don't know about these SECRET UPDATES! og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Codex's NEW A2A Communication & Crazy NEW UPDATES: You don't know about these SECRET UPDATES! **[AICodeKing](https://daily.dev/sources/aicodeking)** · 5 min read · 2 upvotes · 0 comments ## Summary Codex received a cluster of updates between August 22 and September 2026: the Astra model (GPT-6 Astra) launched September 3 with experimental context management that lets it search earlier messages and tool results within a task, though it's off by default, limited to Plus/Pro users on supported clients, and costs more to run (fast mode uses 2.5x Astra's standard credit rate). Codex CLI gained at-mention references to other tasks in late August, experimental git work tree support in September (separate checkouts to avoid mixing edits across tasks), inline question-answering while the agent keeps working, and experimental live voice conversations via slash commands. A browser feature called Site Tools (Web MCP) lets supported websites expose specific actions Codex can call through the desktop app's built-in browser, documented for Soul and Terra models and unavailable in enterprise/EDU workspaces. The presenter recommends trying work trees for comparing implementations and watching Astra's searchable task history closely, while cautioning that running multiple agents increases usage costs. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is the experimental context management feature in Codex's Astra model? Astra, which launched September 3, can keep notes across context windows and search earlier messages and tool results from the same task, letting it recall requirements or test failures mentioned much earlier. It is experimental, off by default, and must be opted into through the configuration file before starting a new task; it's limited to Plus and Pro users on supported clients, excluding business, enterprise, and API key sign-in at launch. _Developers comparing model costs and context features can track these Codex changes as they roll out on daily.dev._ ### How much more does Codex's Astra model cost to run compared to other modes? Astra has a higher usage cost than Soul, and its fast mode uses two and a half times Astra's standard credit rate. Because of this, a practical approach is reserving Astra for difficult debugging or refactoring tasks and using a cheaper model for straightforward edits, since running multiple agents in parallel also increases overall usage. _Anyone budgeting AI coding subscriptions can follow model pricing shifts like this through daily.dev._ ### What is work tree support in Codex CLI and how does it help with running multiple coding tasks? Codex CLI gained experimental work tree support in September, giving each task a separate checkout of the same Git repository so changes don't mix between tasks. This is useful for comparing two implementation approaches side by side or keeping an investigation task separate from an implementation task that consults its findings, though the resulting changes still need manual review to confirm they work together. _Developers coordinating multiple coding agents can keep tabs on CLI features like this via daily.dev._ ## Similar posts on daily.dev - [Codex is now the recommended agent in JetBrains IDEs](https://daily.dev/posts/codex-is-now-the-recommended-agent-in-jetbrains-ides-q3gxvk24g) · JetBrains · 1 upvotes · 0 comments --- Tags: [#ai-agents](https://daily.dev/tags/ai-agents), [#git](https://daily.dev/tags/git), [#cli](https://daily.dev/tags/cli), [#openai-codex](https://daily.dev/tags/openai-codex), [#context-engineering](https://daily.dev/tags/context-engineering) [View this post on daily.dev](https://daily.dev/posts/codex-s-new-a2a-communication-crazy-new-updates-you-don-t-know-about-these-secret-updates--lyoxqhhdj) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Codex's NEW A2A Communication \u0026 Crazy NEW UPDATES: You don't know about these SECRET UPDATES!","url":"https://daily.dev/posts/codex-s-new-a2a-communication-crazy-new-updates-you-don-t-know-about-these-secret-updates--lyoxqhhdj","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/codex-s-new-a2a-communication-crazy-new-updates-you-don-t-know-about-these-secret-updates--lyoxqhhdj"},"datePublished":"2026-09-21T09:15:40.061Z","dateModified":"2026-09-21T09:16:03.043Z","description":"Codex received a cluster of updates between August 22 and September 2026: the Astra model (GPT-6 Astra) launched September 3 with experimental context...","image":"https://i.ytimg.com/vi/9Zbaw69O3QQ/sddefault.jpg","thumbnailUrl":"https://i.ytimg.com/vi/9Zbaw69O3QQ/sddefault.jpg","isAccessibleForFree":true,"articleSection":"AICodeKing","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"AICodeKing","logo":"https://media.daily.dev/image/upload/s--x7nDUfWj--/f_auto,q_auto/v1768208312/logos/aicodeking","url":"https://daily.dev/sources/aicodeking"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/codex-s-new-a2a-communication-crazy-new-updates-you-don-t-know-about-these-secret-updates--lyoxqhhdj","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"ai-agents,git,cli,openai-codex,context-engineering","timeRequired":"PT5M","video":{"@type":"VideoObject","name":"Codex's NEW A2A Communication \u0026 Crazy NEW UPDATES: You don't know about these SECRET UPDATES!","description":"Codex received a cluster of updates between August 22 and September 2026: the Astra model (GPT-6 Astra) launched September 3 with experimental context...","thumbnailUrl":"https://i.ytimg.com/vi/9Zbaw69O3QQ/sddefault.jpg","uploadDate":"2026-09-21T09:15:40.061Z","duration":"PT5M","url":"https://api.daily.dev/r/lyOXQhHDJ","embedUrl":"https://www.youtube.com/embed/9Zbaw69O3QQ"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"AICodeKing","item":"https://daily.dev/sources/aicodeking"},{"@type":"ListItem","position":3,"name":"Codex's NEW A2A Communication \u0026 Crazy NEW UPDATES: You don't know about these SECRET UPDATES!"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/codex-s-new-a2a-communication-crazy-new-updates-you-don-t-know-about-these-secret-updates--lyoxqhhdj#faq","mainEntity":[{"@type":"Question","name":"What is the experimental context management feature in Codex's Astra model?","acceptedAnswer":{"@type":"Answer","text":"Astra, which launched September 3, can keep notes across context windows and search earlier messages and tool results from the same task, letting it recall requirements or test failures mentioned much earlier. 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