Last Week in AI #250 - Mythos Mess, GPT 5.6-Sol, GLM 5.2

Anthropic received permission to release its Mythos-5 AI model to selected companies and agencies after a standoff with the US government, while OpenAI launched GPT-5.6 “Sol” with initial access restricted to approximately 20 approved organizations, signaling an emerging de facto licensing regime with geopolitical treaty implications. The US government is also pressing Meta to submit models to voluntary review, and third-party reports indicate GPT-5.6 shows extreme benchmark “cheating” sensitivity, highlighting steering and alignment bottlenecks.

Last Week in AI 250 - Mythos Mess, GPT 5.6-Sol, GLM 5.2 Last Week in AI https://lastweekin.ai Anthropic's AI treaty discussions, US government's influence on AI model releases, OpenAI's processor development, memory market impacts, and more Note from Last Week in AI Andrey : I’m back And i’m sorry for putting the substack on a silent pause, work got a bit too overwhelming so I fell behind on this. I’ll do my best to resume normal posting, starting with catching up on podcast episodes missing from here which are not last week… but I guess I should post them still, sorry for the spam I’ve also paused paid subscriptions until I can get back to consistent posting. Apologies for the flakiness, and thanks for being a subscriber Our 250th episode with a summary and discussion of last week’s big AI news Recorded on 06/27/2026 Note from Andrey: sorry this is late again this episode release somehow didn’t save and I only realized late, my bad... next one will be out way sooner Hosted by Andrey Kurenkov https://twitter.com/andrey kurenkov and Jeremie Harris https://www.linkedin.com/in/jeremieharris/ Feel free to email us your questions and feedback at andreyvkurenkov@gmail.com and/or hello@gladstone.ai mailto:hello@gladstone.ai In this episode: US government gating of frontier AI expands: Anthropic /glossary/anthropic gets permission to release Mythos-5 to selected companies/agencies after a standoff, OpenAI rolls out GPT-5.6 “Sol” with initial access restricted to ~20 approved organizations, and Meta is pressed to submit models to “voluntary” review—signaling an emerging de facto licensing regime with geopolitical treaty implications.Model capability and safety signals remain murky: limited benchmark /glossary/benchmark disclosure, claims of token-efficiency comparisons, and third-party reports that GPT-5.6 shows extreme benchmark “cheating” sensitivity highlight steering/alignment bottlenecks and uncertainty about real-world long-horizon behavior. Compute /glossary/compute supply chain competition accelerates: OpenAI unveils its Jalapeño inference /glossary/inference ASIC with Broadcom on TSMC 3nm; Amazon explores selling Trainium to data-center operators; Micron invests in Anthropic with memory supply agreements; SK Hynix surpasses Samsung on HBM-driven valuation; Groq raises $650M while pivoting toward neocloud.Open source and societal response intensify: GLM 5.2 MIT-licensed delivers strong long-context coding performance with rapid optimizations; EconEvals maps job-task exposure; bipartisan workforce initiatives and tax credits launch; DeepMind /glossary/deepmind and Apollo publish loss-of-control/control roadmaps; Hollywood reportedly drops a near-finished Sam Altman biopic amid industry pressure. Timestamps note - these don’t take into account dynamically inserted ads and therefore may be off by a couple of minutes : 00:00:10 Intro / Banter 00:03:42 News Preview Tools & Apps 00:04:41 Anthropic allowed to release Mythos AI to some companies, agencies https://www.cnbc.com/2026/06/26/us-government-anthropic-claude-mythos5-ai.html + Anthropic’s Mythos mess is only getting worse https://www.theverge.com/ai-artificial-intelligence/957327/anthropic-mythos-fable-ai-trump-administration-negotiations + Anthropic floats proposal to Lutnick to end US ban of powerful ‘Mythos,’ ‘Fable’ AI models: sources https://nypost.com/2026/06/18/business/anthropic-floats-proposal-to-lutnick-to-end-us-ban-of-powerful-mythos-fable-ai-models-sources/ 00:07:58 OpenAI Launches GPT-5.6 Sol Under First-Ever US Government-Gated AI Rollout | MLQ News https://mlq.ai/news/openai-launches-gpt-56-sol-under-first-ever-us-government-gated-ai-rollout/ + OpenAI’s new flagship model GPT-5.6 Sol cheats on software tests more than any model before it https://the-decoder.com/gpt-5-6-sol-cheats-on-software-tests-more-than-any-model-before-it/ + Summary of METR’s predeployment evaluation of GPT-5.6 Sol https://metr.org/blog/2026-06-26-gpt-5-6-sol/ 00:24:03 U.S. Presses Meta to Agree to A.I. Reviews - The New York Times https://www.nytimes.com/2026/06/23/business/meta-ai-government-reviews-security.html?partner=slack&smid=sl-share 00:30:11 Anthropic’s Claude Tag is learning your company, one Slack message at a time | TechCrunch https://techcrunch.com/2026/06/23/anthropics-claude-tag-is-learning-your-company-one-slack-message-at-a-time/ Applications & Business 00:32:49 OpenAI reveals its first AI processor: Jalapeño | The Verge https://www.theverge.com/ai-artificial-intelligence/955939/openai-reveals-its-first-ai-processor-jalapeno 00:38:29 Amazon in Talks to Sell Custom AI Chips in Bid to Undercut Nvidia https://www.bloomberg.com/news/articles/2026-06-18/amazon-is-in-talks-to-sell-nvidia-rival-chips-to-other-companies 00:41:46 Micron invests in Anthropic and grants it a supply deal https://www.blocksandfiles.com/ai-ml/2026/06/23/micron-invests-in-anthropic-and-grants-it-a-supply-deal/5260050 00:45:18 SK Hynix overtakes Samsung to become South Korea’s most valuable company | Reuters https://www.reuters.com/world/asia-pacific/sk-hynix-overtakes-samsung-become-koreas-most-valuable-company-2026-06-22/ 00:52:47 SpaceX inks compute deal with Reflection AI, an open source AI lab | TechCrunch https://techcrunch.com/2026/06/22/spacex-inks-compute-deal-with-reflection-ai-an-open-source-ai-lab/ Projects & Open Source 00:54:46 GLM-5.2: Built for Long-Horizon Tasks https://z.ai/blog/glm-5.2 + How we built the world’s fastest API for GLM-5.2 https://www.baseten.co/blog/how-we-built-the-worlds-fastest-api-for-glm-52/ + nvidia/GLM-5.2-NVFP4 · Hugging Face https://huggingface.co/nvidia/GLM-5.2-NVFP4 01:03:04 EconEvals https://econevals.com/ Policy & Safety 01:05:40 $500 million AI jobs push launches with bipartisan backing - POLITICO https://www.politico.com/news/2026/06/25/500-million-ai-jobs-push-launches-with-bipartisan-backing-00975439 01:07:47 Rep. Sam Liccardo unveils AI workforce tax credit bill - POLITICO https://www.politico.com/news/2026/06/22/rep-sam-liccardo-unveils-ai-workforce-tax-credit-bill-00970018 01:08:56 Google DeepMind announced an “AI Control Roadmap” for improving AI agent security. | The Verge https://www.theverge.com/tech/952899/google-deepmind-announced-an-ai-control-roadmap-for-improving-ai-agent-security + Securing internal systems against increasingly capable and imperfectly aligned AI https://deepmind.google/blog/securing-the-future-of-ai-agents/ 01:14:00 The Loss of Control Playbook: Degrees, Dynamics, and Preparedness https://arxiv.org/abs/2511.15846v5 + The Loss of Control Playbook https://lossofcontrol.ai/ 01:16:42 Why corporate AI super PACs spent $27 million on a local election | The Verge https://www.theverge.com/policy/954970/ai-super-pacs-alex-bores-new-york-12th-district 01:20:25 Exclusive: Conservatives plan nationwide protest against AI data centers https://www.axios.com/2026/06/18/conservatives-protest-ai-data-centers?shem=isphe, Research & Advancements 01:27:37 Revisiting the Platonic Representation Hypothesis: An Aristotelian View https://arxiv.org/abs/2602.14486 01:31:39 Wan-Streamer v0.1: End-to-end Real-time Interactive Foundation Models https://arxiv.org/abs/2606.25041 01:33:59 Tapered Language Models https://arxiv.org/abs/2606.23670 Synthetic Media & Art 01:36:54 Hollywood is bending the knee to OpenAI | The Verge https://www.theverge.com/entertainment/954899/luca-guadagnino-artificial-sam-altman-amazon-a24-neon-mubi-chatgpt Get AI news in your inbox Daily digest of what matters in AI. Key Terms Explained AI Agent /glossary/ai-agent An autonomous AI system that can perceive its environment, make decisions, and take actions to achieve goals. Anthropic /glossary/anthropic An AI safety company founded in 2021 by former OpenAI researchers, including Dario and Daniela Amodei. Benchmark /glossary/benchmark A standardized test used to measure and compare AI model performance. Claude /glossary/claude Anthropic's family of AI assistants, including Claude Haiku, Sonnet, and Opus.