Inter-office memo

To
Everyone working with AI agents
From
Enjoy Agentic Industries
Re
What changed, and what it means for your work

Blog.

What changed in AI agents, their plans, limits and models, and what it means for your work.

  1. OpenAI cancels the ChatGPT Pro 200 cut and doubles Pro 100 and Pro 500 usageOpenAI dropped the Pro 200 cut due October 30 and doubled Codex and Work usage on Pro 100 and Pro 500. What each plan gets now, and which to pick.
  2. OpenAI shut down GPT-3.5 Turbo, GPT-4, o1, o3-mini and o4-mini in its API on October 23On October 23, 2026, OpenAI’s API dropped gpt-3.5-turbo, gpt-4, o1, o3-mini, o4-mini and more. What stopped working, what didn’t, and what to switch to.
  3. Claude API version 2026-10-21 removes temperature. What breaks, and how to upgradeAnthropic’s first API version since 2023 drops temperature, top_p and top_k and ships new SDK majors. What breaks, who must act, and how to upgrade.
  4. Claude Duet: who can get Anthropic’s new agent, and what it costsClaude Duet is a waitlist preview for US Pro and Max plans. Who gets it, how it uses your limits, and how it compares with ChatGPT’s dots.
  5. OpenAI’s models are coming to Google Cloud and Antigravity. What changes for CodexOpenAI and Google Cloud’s October 21 deal, explained: what’s available now, when GPT reaches Antigravity, and what it means if you use Codex.
  6. How to run Flint, the free coding model that runs on a laptopRecursive’s Flint is a free, Apache 2.0 coding model for your own computer. What it needs, how to run it, and how to give it real agent work.
  7. Antigravity keeps Claude on free accounts until November 18, not November 2Google moved the date. Claude now leaves Antigravity’s Free, AI Plus and AI Pro trial accounts on November 18, 2026. Who keeps it, and what to do.

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