This Week in AI: Astra Goes to Work, and Custom GPTs Get a Sunset Date

Trackline Academy · Week of September 15, 2026 · All articles

Last week the labs shipped new flagships. This week they weaponized them. GPT-6 Astra spread from chat into ChatGPT Work, Codex, and the API, OpenAI quietly announced the retirement of custom GPTs, both OpenAI and Anthropic launched finance-industry products within four days of each other, Salesforce landed inside Claude, and Google put Gemini on the Windows desktop. Here is what actually changed, verified against official sources, and what it means for how you work.

The headline: Astra becomes a platform, and the finance war begins

On September 9, OpenAI pushed GPT-6 Astra across ChatGPT Work, Codex, and the API, turning last week's flagship model into a full workplace platform. The next day brought an Agents API in public beta (the same infrastructure that powers Codex, now available to any developer) and a Data plugin that analyzes connected business data and builds dashboards inside ChatGPT Work.

Then the sharpest storyline of the week: within four days, both major labs launched dedicated products for the same industry. OpenAI's ChatGPT for Financial Services (September 10, built with Morgan Stanley and Evercore, with licensed data from PitchBook, LSEG, and others) and Anthropic's Claude for Financial Advisors (September 14, connecting to Schwab, BlackRock, Vanguard, Addepar, and more, with eight advisor workflow skills). The frontier labs are no longer competing model by model; they are competing vertical by vertical, and finance went first. If your industry is next, the tools are about to come to you.

ChatGPT: a dense week, and one deadline to know about

Custom GPTs are being retired (September 11). The biggest item for most readers: OpenAI announced custom GPTs will be phased out across all plans in favor of plugins (reusable instructions plus connected apps). Existing GPTs keep working until plan-specific retirement dates, and a migration FAQ is live. If you built GPTs or rely on the GPT Store, the skills transfer, but the packaging is changing under you.
Pro $200 sign-ups paused (September 10). You can no longer newly buy or upgrade to the top Pro 20x tier; existing subscriptions keep renewing. The $100 Pro tier remains fully available, with Astra in normal chat (50 messages a week; 200 on the $200 tier).
Voice grew up (September 9). ChatGPT Voice can now think with GPT-5.6 or Astra, and the old Voice intelligence levels are gone, replaced by GPT-Live allowances that vary by plan (3 hours a day on Go and Plus up to unlimited on the $200 Pro tier).
Images 2.5 (September 8) brought sharper detail, precise editing, and mobile sketch-to-image, with limits unchanged.
A privacy default worth checking (September 14): newly connected Health plugins now default to your global plugin permission setting, so ChatGPT can use connected health data when relevant without a per-use prompt. Sensitive actions still require approval; review it under Settings, then Plugins, then Health if that matters to you.

Claude: the ecosystem plays

Salesforce in Claude launched in beta (September 15) on all paid Claude plans for Salesforce-approved organizations: accounts, opportunities, and pipeline inside Claude, with 37 prebuilt sales skills and permissions enforced by Salesforce itself. The first fruit of the Claudeforce partnership, with Claude also becoming the default model behind Agentforce and Slack.
Claude for Small Business expanded (September 15) to 43 workflows and 27 new integrations (Shopify, Stripe, Square, Xero, Gusto, Zapier among them), with free in-person workshops rolling out this fall and over 900,000 installations cited since May.
The September threat intelligence report (September 10) detailed how attackers increasingly embed AI models in autonomous multi-agent frameworks. Worth a skim if you handle security for anything; the gap between nation-state and low-resource attackers is shrinking.

Gemini: quietly everywhere

Cross-app orchestration (September 9): Gemini can now create documents, draft emails, schedule meetings, and build task lists across Workspace regardless of which app you are in, for Business and Enterprise editions plus consumer Pro and Ultra (scheduling excluded on Pro; English first).
A native Windows app (September 11) with an Alt+Space quick-access shortcut, bringing Gemini alongside your desktop workflows on Windows 10 and 11.
Gmail search AI Overviews went global (September 15) for paid English-language users with Workspace Intelligence enabled.

Gemini Notebook: one change, aimed at teams

A quiet week for Notebook, with one meaningful unlock: admins can now allow external and even public notebook sharing (September 10), replacing the old all-or-nothing toggle with four granular settings (off, trusted domains, any external email, or public links), configurable per domain, department, or group. Practical upshot: once your admin flips it, work notebooks can finally be shared with clients and collaborators outside your organization. The compute-based usage limits that arrived September 2 are settling in; note that Google's own upgrade page still shows the legacy daily-cap table under a transition banner, so do not be confused if you see both systems described.

The thread connecting all of it: the tools are coming to where you already work. Salesforce inside Claude, business data inside ChatGPT, Gemini across every Workspace app and now the Windows desktop, notebooks shareable with clients. The differentiator is no longer access; it is knowing how to direct these systems inside your actual workflow, and how to check their work.

What this means for your week

Built a custom GPT? It still works, but start thinking in plugins. The instructions and knowledge you packaged transfer; watch for your plan's retirement date in OpenAI's migration FAQ.
Considering the $200 ChatGPT Pro tier? That door is closed for now. New sign-ups are paused with no end date announced; the $100 tier still includes Astra in chat.
In finance? Your tools just arrived. Both labs now sell industry-specific products, and the pattern will repeat for other verticals.
Windows user on Gemini? The desktop app plus Alt+Space is the fastest way yet to keep it one keystroke away.

Our courses are updated as these changes are verified (this week's pass covered the new model hierarchy, plan gating, the custom GPT transition, and the Notebook limits system), and the changes are documented in the open, like this post. One correction from last week's roundup: we described Claude Fable 5.1 as available on every plan including free; access is in fact tiered across paid plans. The article and changelog have been corrected.

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