Open Source · 28 pieces on file
Open Source
Open weights, licences, parameter counts, and what the latest checkpoints actually let an operator do.
Feature · AUGUST 19, 2026
Z.ai holds GLM-5.3 weights after 84.5% CyberGym result and faster-than-expected exploit-chain lift
GLM-5.3 shares its base model with GLM-5.2; the entire jump — CyberGym 84.5%, ExploitBench 54.4%, 105 ExploitGym tasks in two hours — comes from scaled post-training. Z.ai is delaying open weights by roughly two weeks.
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AUGUST 13, 2026
DeepSeek V4-Pro-0813 goes GA at 1.6T parameters, $0.87 per million out
DeepSeek quietly graduated its trillion-parameter MoE flagship on August 13, ships an MIT-licensed agent harness alongside it, and simultaneously announces a sharp API price hike beginning August 16.
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AUGUST 12, 2026
Meta and NVIDIA drop competing 30B open-weight agentic models within 24 hours
Muse Glimmer and Nemotron 3.5 Lightning both target the always-on agent execution layer on consumer GPUs — one a dense Apache 2.0 distillation, the other a hybrid Mamba MoE clocking 670 tok/s.
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AUGUST 11, 2026
Meta ships Muse Glimmer: a 30B open-weight agent for a single consumer GPU
Meta Superintelligence Labs distilled Muse Spark 1.2 into a 30-billion-parameter Apache 2.0 model that runs on 24–32 GB of VRAM, and pledged to open the teacher's weights within weeks.
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AUGUST 10, 2026
Meta ships Muse Glimmer: a 30B open-weights distill of Muse Spark 1.2 for one consumer GPU
Meta Superintelligence Labs released Muse Glimmer on August 10 under Apache 2.0 — a 30B multimodal agentic model distilled from the closed Muse Spark 1.2, engineered to run on a single 24 GB consumer GPU with day-0 support in transformers, vLLM, and llama.cpp.
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AUGUST 10, 2026
Kimi K3 tops Arena Frontend Code at 1,679 Elo and 2.8T parameters — the largest open-weight release to date
Moonshot AI's 2.8-trillion-parameter Kimi K3 activates 16 of 896 experts per token, ships MXFP4 weights, and charges $3/$15 per million tokens. Full weights landed July 27; Washington is already arguing about what to do about it.
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AUGUST 4, 2026
Alibaba's Qwen3.8-Max lands at 2.4T parameters, 95B active, and #2 on Vision Arena
The new flagship activates 95 billion of its 2.4 trillion parameters per token, supports a 1M-token context, and ships open weights next week alongside a 27B companion — Alibaba's largest release to date and its most direct challenge yet to Anthropic's Fable 5.
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AUGUST 4, 2026
Open-weight GLM-5.2 lands four months behind the frontier — and refuses nothing
A SaferAI evaluation published August 4 finds Z.ai's GLM-5.2 refused zero offensive-cyber or dual-use biology tasks, arriving alongside UK AISI and NIST CAISI measurements that put the open-weight cyber gap at four to seven months and closing.
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AUGUST 1, 2026
DeepSeek V4-Flash-0731: A Re-Post-Trained Budget Model That Beats Its Own Flagship
DeepSeek moved V4-Flash out of preview on July 31 with a checkpoint identical in architecture to the preview build — 284B total parameters, 13B active, MIT license — that scores higher than V4-Pro-Preview on every agent and coding benchmark the company published.
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JULY 28, 2026
Kimi K3's 2.8T-parameter weights land a day early, and Washington fractures
Moonshot AI pushed the full weights for its 2.8-trillion-parameter Kimi K3 on July 26, roughly 24 hours before schedule. Within 48 hours, an industry letter opposing open-weight bans had picked up Google and OpenAI — and Anthropic's Dario Amodei had published a clarification that he does not, in fact, want the weights banned either.
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JULY 27, 2026
Kimi K3 ships its weights: 2.8T parameters, MXFP4, and a 1M-token context
Moonshot AI published the full weights of Kimi K3 on Monday, the largest open-weight model ever released, activating 16 of 896 experts per token and trained MXFP4-native for hardware portability.
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JULY 23, 2026
Moonshot's Kimi K3 lands at 2.8 trillion parameters, weights follow July 27
Moonshot AI unveiled Kimi K3 on July 17 — a 2.8T-parameter sparse MoE with a 1M-token context — and promised full open weights ten days later. The release reshuffled the open-weight frontier and knocked TSMC down 7%.
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JULY 20, 2026
Kimi K3 lands at 2.8T parameters, takes Frontend Code Arena, jams Moonshot's own capacity
Moonshot's July 17 open-weight release outscored every model except Claude Fable 5 and GPT-5.6 on its own suite, took the Arena Frontend Code top slot at 1,679 points, and forced the company to pause new subscriptions inside 72 hours.
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JULY 20, 2026
Moonshot ships Kimi K3 at 2.8T parameters — the largest open-weight model, weights due July 27
Beijing-based Moonshot released a sparse-MoE frontier system with a 1M-token context and Kimi Delta Attention, claiming a #2–3 overall finish behind Claude Fable 5 and GPT-5.6 Sol on the company's own eval suite.
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JULY 18, 2026
Moonshot's Kimi K3 lands at 2.8T parameters, sits behind only Fable 5 and GPT-5.6 Sol
Beijing's Moonshot AI unveiled Kimi K3 on July 16 — a 2.8-trillion-parameter sparse MoE with a 1M-token context window, novel Kimi Delta Attention, and full weights due July 27. It is the largest open-weight model ever released.
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JULY 17, 2026
Moonshot ships Kimi K3 at 2.8T parameters, third on Intelligence Index
Beijing's Moonshot AI released Kimi K3 on July 16 — a 2.8-trillion-parameter sparse MoE with Kimi Delta Attention, a 1M-token context window, and API pricing at $3/$15 per million tokens. Full weights are due July 27.
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JULY 15, 2026
Chinese open-weight models pass 41% of Hugging Face downloads as Nadella tells enterprises they're paying twice
Chinese labs took the top six slots on OpenRouter and 41% of Hugging Face downloads this spring. On July 13, Microsoft's CEO gave the shift its first executive-suite endorsement.
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JULY 14, 2026
Chinese open weights take 41% of Hugging Face downloads and all six top OpenRouter slots
Real production-traffic data from OpenRouter and Vercel's AI Gateway shows US model share collapsing from 70% to 30% in twelve months, with DeepSeek, Z.ai, Tencent, Xiaomi, and MiniMax now processing three times more tokens per week than American labs.
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JULY 14, 2026
Goldman initiates on Z.ai at HK$1,880; GLM-5.2 scores 81.0 on Terminal-Bench 2.1
Goldman Sachs named Z.ai's GLM-5.2, DeepSeek and ByteDance its preferred Chinese AI stack on July 10, days after the 744B-parameter MIT-licensed model cleared Gemini 3.1 Pro on terminal work and undercut GPT-5.5 API pricing by roughly 6x.
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JULY 5, 2026
Meituan ships LongCat-2.0: 1.6T MoE, 1M context, trained end-to-end on Chinese ASICs
Meituan open-sourced LongCat-2.0 on Hugging Face and GitHub under MIT, unmasking the 1.6-trillion-parameter MoE that had been leading OpenRouter as 'Owl Alpha' — and the first trillion-parameter system pretrained and served entirely on a 50,000-card domestic ASIC cluster.
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JUNE 24, 2026
GLM-5.2 lands at 744B parameters, MIT-licensed, and tied with Opus 4.8 on long-horizon coding
Z.ai's open-weights flagship debuts at #1 on open-source coding boards with a 1M-token context, IndexShare cutting per-token FLOPs 2.9x, and API pricing roughly one-sixth of GPT-5.5's.
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JUNE 23, 2026
OpenAI ships full GPT-5.5-Cyber at 85.6% CyberGym, opens Patch the Planet with Trail of Bits across 19 projects
The Daybreak expansion pairs a permissive-only preview's full release — 85.6% CyberGym, 39.5% ExploitGym — with an open-source remediation sprint that merged dozens of patches across cURL, Python, and the Linux kernel in its opening week.
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JUNE 14, 2026
US orders Anthropic to pull Fable 5 and Mythos 5 worldwide over a narrow jailbreak claim
A Commerce Department export-control letter sent at 5:21 pm ET on June 12 forced Anthropic to disable its Mythos-class models for every user globally — three days after Fable 5's general release.
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JUNE 13, 2026
Z.ai Ships GLM-5.2 With 1M-Token Context and an MIT Pledge — and No Benchmarks
Zhipu's international brand pushed its 744B MoE flagship to a million-token window and added dual thinking-effort presets, but launched without a single score and gated the weights behind a 'next week' promise.
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JUNE 12, 2026
Kimi K2.7-Code ships open weights, cuts thinking tokens 30%, and edges Opus 4.8 on MCPMark
Moonshot's coding-focused post-train on the K2.6 MoE family lands on Hugging Face under a Modified MIT license, reports +21.8% on its own Kimi Code Bench v2, and forces thinking mode on every call.
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JUNE 11, 2026
OpenAI files confidential S-1 with the SEC, one week after Anthropic
OpenAI confirmed a draft registration statement on June 10, 2026 at an $852 billion valuation. Goldman Sachs and Morgan Stanley are leading; the company says it has not committed to a timeline.
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JUNE 9, 2026
Microsoft ships seven MAI models from scratch, declares independence from OpenAI distillation
At Build 2026, Mustafa Suleyman's AI Superintelligence team unveiled MAI-Thinking-1 at 97% on AIME 2025 and 53% on SWE-Bench Pro, alongside a 5B-active coding model that lands today as a VS Code default — all trained without third-party distillation.
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JUNE 6, 2026
Microsoft ships seven MAI models, with MAI-Thinking-1 matching Opus 4.6 on SWE-Bench Pro
At Build 2026, Microsoft AI released a 35B-active-parameter sparse MoE reasoning model trained from scratch, plus six companions across image, voice, transcription, and coding. The flagship hits 97% on AIME 2025 and 53% on SWE-Bench Pro.