Topic · 36 stories
Models
Stories
Introducing Mistral Large 4: Le chonk (Simon Willison)
blog post · Story page
API preview: 1T parameters, 49B active, open weights promised
Introducing d1: The most capable decision model, now with vision (Liquid AI)
Liquid AI's decision model now takes images as well as text
Strands Decider: Why Not an Encoder? (Marc Brooker)
blog post · Story page
Five designs compared behind a 2B decider model
Unitree just dropped UnifoLM-WLA-1.0: a single 6B model that does 64 whole-body + tabletop tasks on a real humanoid (r/LocalLLaMA)
Reddit thread · Story page
A 6B humanoid model trained on about 2,500 hours of robot data
Jeff-Qwen3.5-0.8B v1.2 + 9 LoRA adapters: put it in front of Qwen3.8-27B for 38x faster decisions and +8.7 points accuracy, for under 2 GB extra memory (r/LocalLLaMA)
Reddit thread · Story page
A 0.8B model picks between options you define and returns a calibrated probability for each, now with nine LoRA adapters of about 40 MB apiece for recurring agent decisions like tool choice and prompt-injection detection. The speed and accuracy numbers are the author's own, on the author's hardware.
Introducing Clef: our open-source decision models, and new RL fine-tuning platform (Cloudflare)
blog post · Story page
Decision models on Workers AI, plus RL fine-tuning
NVIDIA Nemotron-Labs-3-Competitive-Coding 550B-A55B (r/LocalLLaMA)
Reddit thread · Story page
NVIDIA fine-tuned Nemotron-3-Ultra on 477,642 synthetic reasoning traces distilled from GLM-5.2, then paired it with GenCorrect, which refines candidates on evaluator feedback. The card reports 535.4 out of 600 on IOI 2026 under official contest constraints.
Introducing GPT-6.1 Sol (OpenAI)
blog post · Story page
A cheaper tier for coding and computer use
GLM-5.2: Open Weights, Near-Frontier Intelligence (Zixuan Li (Z.ai))
talk · Story page
Li says the open-weight GLM-5.2 lands between Claude Opus 4.7 and 4.8 on the hardest long-horizon coding and agentic benchmarks, and that its non-thinking mode beats GLM-5.1 with thinking turned on. Z.ai also introduced Z Code, its own coding harness.
Claude Opus 5.5 now available on AI Gateway (Vercel)
blog post · via METR · Story page
Two API changes turn previously valid requests into HTTP 400: thinking is always adaptive, so disabling it or setting a fixed budget is rejected, and forced tool use is retired. Vercel says Anthropic cites Fable 5.1-level performance at roughly 30% faster and 40% cheaper per task than Opus 5.
Von: Open-source 395M "System One" model (r/LocalLLaMA)
Reddit thread · Story page
Von is an open-source 395M System One model pitched as a drop-in replacement for TypeSafe's JEV. Its author says it runs on CPU in 1 to 2 GB, answers in 25 to 300 ms, and beats JEV in all benchmarks.
System One models like Jev can train their own replacements (Sean Goedecke)
blog post · Story page
The case for promptable classifiers training their own replacements
Jev means structured output is interesting again (Sean Goedecke)
blog post · Story page
A model that takes prose and returns only structured output
Intern-S2-397B: InternLM's multimodal foundation model for scientific intelligence and long-horizon agents (r/LocalLLaMA)
Reddit thread · Story page
InternLM's 397B science model trained with long-horizon agent RL
Edge0 Streams an 8B AI Model From SSD Using Only 1 GiB (AlphaSignal)
newsletter item · Story page
8B sparse MoE streaming experts from SSD, per AlphaSignal
Qwen 3.8 Max 0902 now available on AI Gateway (Vercel)
blog post · Story page
Qwen 3.8 Max 0902 snapshot lands on Vercel AI Gateway
Anthropic introduces Claude Fable 5.1 and Claude Mythos 5.1 (@claudeai)
X post · Story page
Anthropic released Claude Fable 5.1 and Claude Mythos 5.1, reporting 55.8% on Terminal-Bench 4.0 against 42.0% for Fable 5, with cache reads priced 75% below Fable 5. Fable 5.1 is available everywhere today, while Mythos 5.1, aimed at cyberdefenders and life scientists, goes through trusted-access programs.
OpenAI previews Astra safety evaluation as it reaches 'Critical' cyber threshold (@OpenAI)
X post · Story page
Ahead of releasing Astra, OpenAI says the model reaches the Critical threshold for cybersecurity under its Preparedness Framework and previews how it evaluated the model before shipping.
Introducing Hy4 Preview (Simon Willison)
blog post · Story page
Tencent's open-weight, text-only Hy4 Preview: 770B total parameters, 49B active, a 1M-token context window, 1.56TB on Hugging Face, up from Hy3's 295B in July. Simon Willison reads the chat template instead of the benchmarks and finds what appear to be two reasoning modes, high and no_think, for a harness to drive.
dots3-note Preview: open-weight 280B MoE (16B active) built for hours-long agentic tasks (@omarsar0)
X post · Story page
Dots Studio's open-weight model for tasks that run for hours or days: 280B total parameters, 16B active, 512K context, with text, vision, and speech. Free to try via OpenRouter.
UI-Mate-27B: Tencent's open-weight GUI agent for long-horizon computer use (r/LocalLLaMA)
Reddit thread · Story page
Apache-2.0 27B GUI agent on Qwen3.6, with demonstration-guided mode
GLM-5.3: Frontier coding with emergent cyber capabilities (Hacker News)
HN thread · 860 points on HN · Story page
Coding model with emergent cyber capabilities; 860 points on Hacker News.
Alibaba Opens Qwen3.8-Max Weights, Letting Teams Self-Host a 2.4T Model (AlphaSignal)
newsletter item · Story page
Qwen3.8-27B and the 2.4T-A95B Max model, open under Apache 2.0.
DeepSeek V4-Pro Goes Live and Runs OpenAI's Own Coding Agent 8x Cheaper (AlphaSignal)
newsletter item · Story page
DeepSeek-V4-Pro exits four months of preview with agent-focused upgrades, configurable reasoning modes, and native Responses API support for Codex workflows. The headline claims it runs OpenAI's own coding agent at one eighth the cost.
OpenAI previews Ultrafast mode: GPT-5.6 Sol at up to 14x speed (@OpenAI)
X post · Story page
OpenAI is previewing Ultrafast mode: GPT-5.6 Sol at up to 14x its normal speed on Cerebras hardware, up to 750 tokens per second, launching first in the API with select customers.
Google DeepMind releases Gemini 3.7 Flash (@GoogleDeepMind)
X post · Story page
Google DeepMind released Gemini 3.7 Flash, positioned as stronger than 3.6 Flash on debugging and issue resolution, with better web layouts from fewer prompts and improved reasoning on business workflows.
The builder’s guide to GPT‑5.6 (OpenAI News)
blog post · Story page
OpenAI's builder guide to GPT-5.6 and the Responses API
Introducing Grok 4.6: built for long-running agents and more ambitious interactive and visual work (Cursor)
blog post · Story page
xAI's Grok 4.6 targets long-running agents and multi-step coding, research, and visual work. It matches GPT-5.6 Sol on the Artificial Analysis Intelligence Index, a nine-benchmark composite, and is in Cursor and Grok Build today with 2x included usage for the first week.
NVIDIA Nemotron 3.5 Lightning Delivers Fast, Accurate Specialized Task Execution for Long-Running Agents (NVIDIA Developer)
blog post · Story page
NVIDIA's Nemotron 3.5 Lightning for the high-volume execution work that fills a long-running agent's time: tool calls, result validation, and subagent delegation.
Simon Willison's notes on Muse Glimmer 30B, Meta's first Apache 2.0 model (@simonw)
X post · Story page
Simon Willison's notes on Meta's Muse Glimmer 30B, the company's first open-weight model under Apache 2.0 rather than the Llama line's custom non-OSI license.
Microsoft's MAI-Code-1.1-Flash Hits GitHub Copilot at 73% Lower Cost (AlphaSignal)
newsletter item · Story page
Microsoft's MAI-Code-1.1-Flash lands in Copilot with native vision
Anthropic makes Claude Sonnet 5's introductory pricing permanent (@claudeai)
X post · Story page
Sonnet 5's launch pricing of $2 per million input tokens and $10 per million output, set to end August 31, now stays permanently.
Meta introduces Muse Glimmer, an open-weight 30B model for local agent workflows (@AIatMeta)
X post · Story page
Meta's new open-weight 30B model targets local, always-on agent workflows; Meta claims strong agentic performance for its size category and says it runs entirely on local hardware.
5 useful things you'll learn in my new post-training textbook (shipping now!) (Nathan Lambert)
blog post · Story page
Nathan Lambert's post-training textbook, finished and shipping
No, local models will not win (Sean Goedecke)
blog post · Story page
The case against local models winning
Claude Opus 5 system prompt now covers the Fable export-control situation (@simonw)
X post · Story page
Simon Willison noticed the Claude Opus 5 system prompt includes details of the Fable export-control situation, so the model can field questions about events outside its knowledge cutoff. He links Anthropic's system-prompt release notes.
Issues that covered it
- Daily
Claude Code's Bash tool changed 12% of calls carrying code or escapes
Plus: UndoBench, a Copilot CLI secret leak, and what Codemode is for. 5 min.
Oct 07, 2026 · 5 min

- Daily
Branch steering breaks the Dual-LLM guarantee for computer-use agents
Plus: swarms borrowing public URL scanners, pipelines that go wrong under replay. 5 min.
Oct 06, 2026 · 5 min

- Daily
VS Code rebuilt its release process around agents and now ships weekly
Plus: an agent that writes its own tools, and a support bot at 80%. 5 min.
Oct 05, 2026 · 5 min

- Daily
Six ways an agent harness can run something other than what you approved
Plus: elaborate harnesses lose to a plain coding agent. 5 min.
Oct 02, 2026 · 5 min

- Daily
Agent context compression can cut tokens by two thirds and still run slower
Plus: a rescored injection benchmark, Letta's self-written workflows. 5 min.
Sep 30, 2026 · 5 min

- Daily
Agent-written pull requests match human ones on revert rates, and fail differently
Plus: two papers pricing what agent context costs to serve and to keep. 5 min.
Sep 28, 2026 · 5 min

- Daily
Dormant prompt injections land on nine production agents where direct orders fail
Plus: what context compression actually saves, and 383 self-written rules on trial. 5 min.
Sep 23, 2026 · 5 min

- Daily
Giving an agent the decoder's confidence never beat a plain deterministic gate
Plus: three agent architectures priced against the same task, and nine quick links. 5 min.
Sep 21, 2026 · 5 min

- Daily
Every audited chat tokenizer lets prompt text forge control tokens
Plus: 91% of audited vibe-coded deployments shipped a hole. 5 min.
Sep 17, 2026 · 5 min

- Daily
An agent deleted an AML control, and benchmark scaffolds do the model's work
Plus: OpenAI's 10,000-agent proof, a 297-iteration model loop, MCP merges Skills. 6 min.
Sep 14, 2026 · 6 min

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