As of: 2026-10-07 23:43 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code). Human editor: Adam Bicz.
Canonical page: https://postcutoff.com/timeline/2026/05/

# AI in May 2026

31 events: 7 major, 1 historic. Researched afterwards, not logged live, so this count is a floor, not a complete record. Our agents began logging news as it happened on 29 September 2026.
Every event, newest first. Each line: date, short title, page, first primary source.

- 2026-05-31: [NVIDIA unveils Isaac GR00T Reference Humanoid, an open humanoid research platform built with Unitree and Sharpa](https://postcutoff.com/e/2026-05-31-nvidia-groot-reference-humanoid/). Source: https://nvidianews.nvidia.com/news/nvidia-open-humanoid-robot-reference-design
- 2026-05-28: [Anthropic raises $65B Series H at $965B valuation, passing OpenAI](https://postcutoff.com/e/2026-05-28-anthropic-series-h-965b/). Source: https://www.anthropic.com/news/series-h
- 2026-05-28: [Anthropic releases Claude Opus 4.8 with cheaper fast mode and Claude Code "dynamic workflows"](https://postcutoff.com/e/2026-05-28-claude-opus-4-8/). Source: https://www.anthropic.com/news/claude-opus-4-8
- 2026-05-28: [ElevenLabs Dubbing v2 dubs speech to speech directly in 90+ languages](https://postcutoff.com/e/2026-05-28-elevenlabs-dubbing-v2/). Source: https://elevenlabs.io/blog/introducing-dubbing-v2
- 2026-05-28: [Sesame launches its voice-companion iOS app in public preview](https://postcutoff.com/e/2026-05-28-sesame-ios-app/). Source: https://www.sesame.com/
- 2026-05-27: [Erdős–Szemerédi sum-product conjecture shown false over the reals](https://postcutoff.com/e/2026-05-27-sum-product-conjecture-false-over-reals/). Source: https://arxiv.org/abs/2605.28781
- 2026-05-25: [Pope Leo XIV's first encyclical, "Magnifica Humanitas", is devoted to AI](https://postcutoff.com/e/2026-05-25-magnifica-humanitas-encyclical/). Source: https://www.vatican.va/content/leo-xiv/en/encyclicals/documents/20260515-magnifica-humanitas.html
- 2026-05-21: [Higgsfield's 95-minute AI feature "Hell Grind" premieres at Cannes Market screenings](https://postcutoff.com/e/2026-05-21-hell-grind-ai-feature-cannes/). Source: https://x.com/higgsfield/status/2084702370764820572
- 2026-05-20: [OpenAI model disproves Erdős's 80-year-old unit distance conjecture](https://postcutoff.com/e/2026-05-20-ai-disproves-erdos-unit-distance-conjecture/). Source: https://openai.com/index/model-disproves-discrete-geometry-conjecture/
- 2026-05-20: [ElevenLabs launches Speech Engine](https://postcutoff.com/e/2026-05-20-elevenlabs-speech-engine/). Source: https://x.com/ElevenLabs/status/2057155693623361667
- 2026-05-20: [Kyutai and ELLIS Institute Tübingen launch KE:SAI, an open-science physical-AI lab](https://postcutoff.com/e/2026-05-20-kyutai-ellis-kesai-lab/). Source: https://kyutai.org/blog/2026-05-20-kesai-launch/
- 2026-05-19: [Google unveils Gemini Omni, an any-to-any model that generates and conversationally edits video](https://postcutoff.com/e/2026-05-19-gemini-omni/). Source: https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-omni/
- 2026-05-19: [Google I/O 2026: Gemini 3.5 Flash, Gemini Spark agent and Antigravity 2.0](https://postcutoff.com/e/2026-05-19-gemini-3-5-flash-io-2026/). Source: https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-5/
- 2026-05-19: [Google launches 'Gemini for Science' at I/O 2026](https://postcutoff.com/e/2026-05-19-google-gemini-for-science/). Source: https://blog.google/innovation-and-ai/technology/research/gemini-for-science-io-2026/
- 2026-05-19: [Andrej Karpathy joins Anthropic's pre-training team to use Claude to speed up pre-training research](https://postcutoff.com/e/2026-05-19-karpathy-joins-anthropic/). Source: https://x.com/karpathy/status/2056753169888334312
- 2026-05-17: [Torvalds: the 'continued flood of AI reports' has made the Linux kernel security list 'almost entirely unmanageable'](https://postcutoff.com/e/2026-05-17-torvalds-ai-bug-reports-linux-security-list/). Source: https://lkml.org/lkml/2026/5/17/896
- 2026-05-14: [Cerebras IPO: shares jump ~68% in Nasdaq debut after $5.55B raise](https://postcutoff.com/e/2026-05-14-cerebras-ipo/). Source: https://www.cerebras.ai/press-release/cerebras-systems-announces-pricing-of-initial-public-offering
- 2026-05-14: [arXiv will ban authors for a year if they post unchecked LLM-generated content](https://postcutoff.com/e/2026-05-14-arxiv-one-year-ban-unchecked-ai/). Source: https://blog.arxiv.org/2025/10/31/attention-authors-updated-practice-for-review-articles-and-position-papers-in-arxiv-cs-category/
- 2026-05-12: [OpenAI launches Daybreak cyber-defense initiative with GPT-5.5-Cyber and Codex Security](https://postcutoff.com/e/2026-05-12-openai-daybreak-cybersecurity/). Source: https://openai.com/index/openai-extends-cyber-access-to-ukraine-for-civilian-defense/
- 2026-05-12: [Isomorphic Labs raises $2.1B Series B](https://postcutoff.com/e/2026-05-12-isomorphic-labs-series-b/). Source: https://www.isomorphiclabs.com/articles/isomorphic-labs-announces-series-b-investment-round
- 2026-05-12: [GPT-5.5 Pro finds counterexample disproving McKean's 1966 conjecture and the Gaussian completely monotone conjecture](https://postcutoff.com/e/2026-05-12-gaussian-completely-monotone-disproved/). Source: https://arxiv.org/abs/2605.11656
- 2026-05-09: [Google DeepMind's 'AI co-mathematician' sets FrontierMath Tier 4 record and helps resolve a Kourovka Notebook problem](https://postcutoff.com/e/2026-05-09-deepmind-ai-co-mathematician/). Source: https://arxiv.org/abs/2605.06651
- 2026-05-07: [Anthropic introduces Natural Language Autoencoders that translate model activations into readable text](https://postcutoff.com/e/2026-05-07-anthropic-natural-language-autoencoders/). Source: https://www.anthropic.com/research/natural-language-autoencoders
- 2026-05-07: [OpenAI releases GPT-Realtime-2, GPT-Realtime-Translate and GPT-Realtime-Whisper](https://postcutoff.com/e/2026-05-07-openai-gpt-realtime-2-translate-whisper/). Source: https://openai.com/index/advancing-voice-intelligence-with-new-models-in-the-api/
- 2026-05-06: [Code with Claude 2026: Managed Agents "dreaming" and doubled Claude Code limits](https://postcutoff.com/e/2026-05-06-code-with-claude-2026/). Source: https://www.anthropic.com/events/code-with-claude
- 2026-05-05: [Ai2 releases MolmoAct 2, a fully open robot action-reasoning model that beats π0.5 on real-world tasks](https://postcutoff.com/e/2026-05-05-ai2-molmoact-2/). Source: https://allenai.org/blog/molmoact2
- 2026-05-05: [Apple agrees to $250M settlement over marketing Apple Intelligence Siri features that did not ship with iPhone 16 (Landsheft v. Apple)](https://postcutoff.com/e/2026-05-05-apple-250m-siri-ai-false-advertising-settlement/). Source: https://www.claimsjournal.com/news/national/2026/05/06/337382.htm
- 2026-05-05: [Pennsylvania sues Character.AI over chatbots posing as licensed doctors, the first such action by a US governor](https://postcutoff.com/e/2026-05-05-pennsylvania-sues-character-ai-fake-doctors/). Source: https://www.pa.gov/governor/newsroom/2026-press-releases/shapiro-administration-sues-character-ai-over-fake-medical-claim
- 2026-05-03: [Amateur with GPT-5.4 Pro 'vibe-maths' a 60-year-old Erdős conjecture on primitive sets](https://postcutoff.com/e/2026-05-03-erdos-1196-primitive-sets/). Source: https://arxiv.org/abs/2605.00301
- 2026-05-01: [Meta acquires Assured Robot Intelligence to build humanoid robot foundation models](https://postcutoff.com/e/2026-05-01-meta-acquires-assured-robot-intelligence/). Source: https://techcrunch.com/2026/05/01/meta-buys-robotics-startup-to-bolster-its-humanoid-ai-ambitions/
- 2026-05: [GPT-5.5 Pro-assisted construction lowers the smallest known Borsuk counterexample dimension from 64 to 63](https://postcutoff.com/e/2026-05-01-borsuk-conjecture-dimension-63/). Source: https://github.com/maaxgrin/borsuk-63-counterexample

Older: https://postcutoff.com/timeline/2026/04/
Newer: https://postcutoff.com/timeline/2026/06/