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With GPT-6’s new Intelligent UI, a question about splitting a bill can return an actual working calculator instead of a paragraph explaining the math.
OpenAI rolled out GPT-6 with Intelligent UI on October 7, letting ChatGPT compose answers using charts, tappable buttons, forms, and small interactive tools it builds on the spot, choosing the format based on the question. It began with Plus, Pro, Business, and Enterprise users, running on GPT-6 Sol, with Free and Go tiers getting GPT-6 Luna starting October 8.
OpenAI says this is an early step, with more work needed on how the model chooses layouts, and that it’s now also able to start displaying an answer while it’s still “thinking” through the rest of the response.
Key Capabilities:

• Live tool creation: Can build a working calculator or checklist directly inside a chat response.
• Tiered rollout: Paid tiers got it first; Free and Go followed one day later.
• No extra cost: Intelligent UI has no separate usage quota from normal chat messages.

A new system called textGrain tags AI-written text from ChatGPT and Codex with an invisible signal, rolling out to EU users to comply with the EU AI Act, while API users worldwide can turn it on voluntarily.
OpenAI's textGrain embeds a statistical pattern in word choices rather than changing how text looks or reads. It's required under Article 50 of the EU AI Act, which took effect in August and mandates machine-readable labeling of AI-generated content. For now, only approved researchers can access the detector that checks for the watermark.
OpenAI's own numbers show the limits: editing just 10% of words in a passage cuts detection from about 92% to 66%, and editing a quarter of the words drops it to 17%. Anthropic added a similar watermark to Claude two months ago.
Key Capabilities:

• EU-only for now: ChatGPT and Codex watermarking applies only to text generated in the EU.
• Global API opt-in: Developers anywhere can turn textGrain on for select models starting today.
• Easily weakened: Light editing or paraphrasing sharply cuts detection accuracy.

GPT-6 Astra, GPT-6.1 Sol, Gemini 4 Argon, and Claude Fable 5.1 all shipped within a month of each other, but their prices per task differ far more than their benchmark scores do.
Astra and Fable 5.1 share the same list price, $10 per million input tokens and $50 per million output tokens, while Sol and Argon cost one-fifth that. The gap that matters most for AI agents is cached-input pricing, the discounted rate for resending the same system prompt or tool instructions repeatedly: Astra charges $1.00 per million cached tokens, four times Fable 5.1's rate and ten times Sol's.
Argon remains the outlier structurally, with a 1 million-token output limit versus 128,000 for the other three, though it's only available through Google's limited Fairwind testing program for now, and its intro pricing is set to double later.
Key Capabilities:

• Price split: Astra and Fable 5.1 cost 5x more per token than Sol and Argon.
• Cache matters for agents: Astra's cached-input rate is 10x pricier than Sol's.
• Access gap: Argon is Fairwind-program-only; the other three are broadly available via API.

Product chief Tibo Sottiaux pledged that for the next 28 days, Codex and ChatGPT Work users get either a genuine improvement or a full usage reset, every single day.
OpenAI's Tibo Sottiaux said the team is focused only on four areas: simplifying features, improving usage efficiency, shipping new models, and building what he called "groundbreaking features." He said user feedback made clear people want the product to get simpler, not more complex.
No specific reset dates, eligible plans, or delivery details have been named, so whether or when your account gets a reset under this pledge isn't confirmed. OpenAI has issued usage resets before, including in August, June, and April of this year.
Key Capabilities:

• The pledge: One meaningful improvement or a full reset, every day, for 28 days (started October 4).
• Focus areas: Simplification, usage efficiency, new models, and major new features only.
• Not guaranteed: No specific reset dates or eligible plans have been confirmed for any account.

OpenAI reopened sign-ups for its $200 Pro plan, but changed the math so new subscribers get roughly half the usage value of the old plan at the same price.
OpenAI reopened $200 Pro sign-ups on September 30 after a three-week pause caused by demand for GPT-6 Astra. Product lead Tibo Sottiaux says the new usage allowance nets out to about half the old plan's value when converted to API pricing, now 10 times Plus usage instead of 20 times.
Existing subscribers keep their old allowance until October 29, after which it also drops. OpenAI isn't bringing back the old 5-hour usage window, and reactions have been sharply mixed, with some users calling it a scam and others welcoming the lower sticker shock on a new $500 Pro tier.
Key Capabilities:

• Allowance cut: New subscribers get 10x Plus usage, down from the previous 20x.
• Grace period: Existing users keep old limits only until October 29.
• New tier: A $500/month Pro plan now offers 25x Plus usage.

The Codex harness, the toolkit that runs OpenAI's coding agent and its new dots, is now open source, and its hosted version just gained the ability to click and type like a person.

OpenAI made the Codex harness open source on September 29, so developers can inspect and reuse the same code that powers Codex, ChatGPT Work, and dots. Its hosted counterpart, the Agents API, added computer-use support, letting an agent operate software directly, plus Codex's multi-agent delegation and tool search.

The Agents API itself launched in public beta earlier, on September 10; the computer-use and multi-agent additions are what's new at DevDay. It's available through the API, and in Codex and ChatGPT Work on the Pro 500 and Enterprise plans.
Key Capabilities:

• Open harness: The Codex CLI, SDK, and app server are public on GitHub.
• Computer use added: Agents can now click, type, and navigate software directly.
• Managed hosting: OpenAI runs the infrastructure, so developers don't host it themselves.

Teams can now work inside ChatGPT itself, on shared pages and slides both people and their dots can edit together, instead of switching to Docs or Slack.
OpenAI launched ChatGPT Space on September 29, a shared workspace for Pro, Business, and Enterprise users. Its core feature, Pages, is an interactive document with charts, checklists, and dashboards that a team, ChatGPT, and a user's dot can all edit. Slides and Sheets are coming later.
Each collaborator uses their own ChatGPT account, so private chats stay separate even on a shared page. Editing works on desktop and web now; mobile can view and share, but not yet create pages.
Key Capabilities:

• Live pages: Interactive documents with charts and dashboards, not static text.
• Human and agent editing: Both teammates and their assigned dots can update the same page.
• Team plugin sharing: Business and Enterprise tiers add shared plugins and scheduled tasks.

Released alongside dots, GPT-6.1 Sol offers close-to-Astra intelligence at a fraction of the price, replacing the week-old GPT-6 Sol.
OpenAI launched GPT-6.1 Sol on September 29, just seven days after GPT-6 Sol. Independent tracker Artificial Analysis says it scores one point below GPT-6 Astra on its Intelligence Index at under a quarter of the cost per task, with pricing unchanged at $2/$10 per million input/output tokens.
The fast replacement cycle shows OpenAI iterating quickly on its cheaper tier while its top model, GPT-6.1 Astra, stayed unreleased after failing internal safety checks.
Key Capabilities:

• Near-flagship score: Just one point below GPT-6 Astra on Artificial Analysis's Intelligence Index.
• Lower cost: Rated at under 25% of GPT-6 Astra's cost per task.
• Bigger cache discount: The cache-read discount rises above the 90% GPT-6 Sol offered.

Unveiled at DevDay 2026, dots run continuously inside ChatGPT on OpenAI's flagship GPT-6 Astra model, connecting to over 4,000 apps to keep working between conversations.
OpenAI launched dots on September 29, powered by GPT-6 Astra. Each dot gets a persistent cloud computer and browser, works through Slack, Teams, or ChatGPT, and can act on saved logins without exposing passwords to the model. Sensitive actions still need approval by default.
Dots are rolling out to Pro and Business Premium users in eligible markets, but not yet to Pro users in the EEA, Switzerland, or the UK. OpenAI also released the cheaper GPT-6.1 Sol the same day, after quietly canceling GPT-6.1 Astra over safety test failures.
Key Capabilities:

• Persistent memory: A dot keeps context and learns from feedback across sessions, not just one chat.
• App reach: Connects to more than 4,000 apps through plugins.
• Built-in guardrails: Follows ChatGPT's existing permissions, with custom rules for what needs human sign-off.

Big announcements often land at this event, but none are confirmed yet. Here is what OpenAI has actually said about the schedule and access.
OpenAI's annual developer conference takes place September 29 at Fort Mason in San Francisco. CEO Sam Altman opens with a keynote at 10 a.m. Pacific. In-person spots were application-only and are now closed.
Any model or product news is still speculation. Past DevDay keynotes have carried major API announcements, so developers will be watching closely. If you miss it live, recordings are posted afterwards.
Key Capabilities:

• Free keynote: Altman's 10 a.m. Pacific talk streams live for anyone, no ticket needed.
• Ticket cost: In-person registration for invitees was $650, with scholarships available.
• Global tour: DevDay Exchanges run in Bengaluru, Tokyo, Seoul, Paris, Berlin, London, São Paulo, and Mexico City.

An image-encoding flaw had been dragging down how both models read pictures. OpenAI shipped the patch across its developer platform and wants image-based evaluations rerun.
Launched September 22, GPT-6 Sol and Luna were misreading pictures. On a visual grounding test (finding objects in an image), OpenAI's chart shows Luna jumping from 28.8% to 60% after the fix.
Any image test run before the patch is now outdated. Teams that judged either model on screenshots or computer-use tasks should rerun those evaluations and retry affected workflows, as OpenAI recommends.
Key Capabilities:

• Big jump: Luna's visual grounding score rose from 28.8% to 60% in OpenAI's own chart.
• Wide reach: Better results now show up in the API, Codex, and computer-use tasks.
• Cheap tiers: Sol and Luna cost half as much as their GPT-5.6 counterparts.

OpenAI upgraded ChatGPT Voice with plugin support for email, calendar, and Slack, running on GPT-6 Astra, Sol, and Luna, and now usable inside ChatGPT Work to create documents and spreadsheets just by talking.
OpenAI upgraded ChatGPT Voice on September 23, adding plugin support for tools like email, calendar, and Slack, so a spoken request can pull from connected apps. Voice now runs on GPT-6 Astra, Sol, and Luna, the same models powering ChatGPT's text and Work modes.
It's also now usable inside ChatGPT Work on web and mobile, letting people create documents, decks, sites, and spreadsheets or handle complex browser tasks just by talking. The rollout is global, though some users report bugs with Voice becoming unresponsive in Codex.
Key Capabilities:

• Plugin-connected: Talk to email, calendar, and Slack directly through voice, no typing needed.
• Upgraded models: Runs on GPT-6 Astra, Sol, and Luna instead of older voice-specific models.
• Full Work integration: Build docs, decks, sites, and spreadsheets in ChatGPT Work by speaking.