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Today in AI

30 stories · 5 announcements · 25 releases
SI
@simonw
4h ago
Model Release

More of my notes on DeepSeek V4 - the really big news is the pricing: both DeepSeek-V4-Flash and DeepSeek-V4-Pro are the cheapest models in their categories while benchmarking close to the frontier models from other providers https://t.co/QQ2iFd4BDr https://t.co/0R0DFYYpSx

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SW
@swyx
6h ago
Model Release

i think the most underated part of today's launch is not GPT 5.5 at all https://t.co/uwJtuJwgRx

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SI
@simonw
6h ago
Model Release

These pelicans are kind of angry looking! Left is deepseek-v4-flash, right is deepseek-v4-pro - both generated using OpenRouter via my LLM tool https://t.co/UbUUd8Rhqr https://t.co/gZlyFk2yKy

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LM
@lmsysorg
7h ago
Announcement

Huge thanks to @radixark for bringing advanced RL capabilities to the SGLang ecosystem! A massive step forward for the open-source RL community. https://t.co/n47sxYNUCX

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DE
@deepseek_ai
7h ago
Model Release

API is Available Today! 🔹 Keep base_url, just update model to deepseek-v4-pro or deepseek-v4-flash. 🔹 Supports OpenAI ChatCompletions & Anthropic APIs. 🔹 Both models support 1M context & dual modes (Thinking / Non-Thinking): https://t.co/ec3B0BDXZi ⚠️ Note: deepseek-…

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DE
@deepseek_ai
7h ago
Model Release

Dedicated Optimizations for Agent Capabilities 🔹 DeepSeek-V4 is seamlessly integrated with leading AI agents like Claude Code, OpenClaw & OpenCode. 🔹 Already driving our in-house agentic coding at DeepSeek. The figure below showcases a sample PDF generated by DeepSeek-V4-…

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DE
@deepseek_ai
7h ago
Model Release

DeepSeek-V4-Flash 🔹 Reasoning capabilities closely approach V4-Pro. 🔹 Performs on par with V4-Pro on simple Agent tasks. 🔹 Smaller parameter size, faster response times, and highly cost-effective API pricing. 3/n https://t.co/dAkP1f2aX0

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DE
@deepseek_ai
7h ago
Model Release

DeepSeek-V4-Pro 🔹 Enhanced Agentic Capabilities: Open-source SOTA in Agentic Coding benchmarks. 🔹 Rich World Knowledge: Leads all current open models, trailing only Gemini-3.1-Pro. 🔹 World-Class Reasoning: Beats all current open models in Math/STEM/Coding, rivaling top https:…

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DE
@deepseek_ai
7h ago
Model Release

🚀 DeepSeek-V4 Preview is officially live & open-sourced! Welcome to the era of cost-effective 1M context length. 🔹 DeepSeek-V4-Pro: 1.6T total / 49B active params. Performance rivaling the world's top closed-source models. 🔹 DeepSeek-V4-Flash: 284B total / 13B active para…

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LM
@lmsysorg
7h ago
Model Release

DeepSeek V4 by @deepseek_ai just dropped! SGLang is ready on Day 0 with a full stack of optimizations from architectures to low-level kernels. We also deliver a verified RL training pipeline in Miles (by @radixark) for V4 at launch: 1️⃣ Native "ShadowRadix" Design: DeepSeek V4's…

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_A
@_akhaliq
7h ago
Model Release

DeepSeek-V4 just dropped on Hugging Face https://t.co/hoGoBnfIMw https://t.co/pHb8MM8QzE

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RE
@reach_vb
8h ago
Model Release

woke up to such brilliant vibes around GPT 5.5 and all the new features we released in Codex! the team really cooked with this model and the app quite literally burning through a lot of nights kudos to all the teams involved and enjoy GPT 5.5

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GD
@gdb
9h ago
Announcement

auto-review now live in codex — using a guardian agent to evaluate the safety of proposed actions, reducing human approvals to only when they're really needed. https://t.co/B1IhkqBZaL

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XA
@xai
12h ago
Announcement

Introducing Grok Voice Think Fast 1.0 A state-of-the-art voice model built for complex, multi-step workflows with snappy responses and high accuracy. It takes the top spot on the Tau Voice Bench and handles real-world messiness like noise, accents, and interruptions better than

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TH
@theo
13h ago
Model Release

GPT-5.5 is here. Ben and I have had access for a bit. We have a lot of thoughts. 00:00:00 - Intro 00:01:34 - Vercel hack 00:05:38 - Kimi K2.6 00:14:29 - Cursor acquired? 00:37:24 - GPT Image 2 00:49:30 - GPT-5.5 01:22:02 - GPT-5.5 Pro https://t.co/x7bC5GreJD

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TH
@theo
13h ago
Model Release

GPT-5.5 is here. Ben and I have had access for a bit. We have a lot of thoughts. 00:01:34 - Vercel hack 00:05:38 - Kimi K2.6 00:14:29 - Cursor acquired? 00:37:24 - GPT Image 2 00:49:30 - GPT-5.5 01:22:02 - GPT-5.5 Pro https://t.co/zsXCfjH9MV

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SI
@simonw
14h ago
Model Release

GPT-5.5 may not be in the official OpenAI API... but it's available via the apparently approved-of Codex API backdoor So I used that to make these pelicans (default and xhigh)! https://t.co/kIx2wnhpqD https://t.co/PP1JXhtEiM https://t.co/5hDFhjWMHy

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GD
@gdb
16h ago
Model Release

GPT-5.5 is a new class of intelligence. This intelligence makes it intuitive to use; it completes challenging tasks with little micromanagement. Also very token efficient, and runs with low latency and at scale. A real step toward a new way of getting computer work done. https:…

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TH
@theo
16h ago
Model Release

GPT-5.5 (medium) is tied for SOTA on Artificial Analysis. GPT-5.5 (high) and GPT-5.5 (xhigh) are meaningfully ahead. xhigh is the first model to break the 50's https://t.co/vmDhaKy5eL

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RE
@reach_vb
16h ago
Model Release

it's pretty insane how token efficient GPT 5.5 - SOTA performance all with significantly lower output tokens!! https://t.co/O9Fc8PQkkj https://t.co/v7zIxCeGo7

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SA
@sama
16h ago
Model Release

1. We believe in iterative deployment; although GPT-5.5 is already a smart model, we expect rapid improvements. Iterative deployment is a big part of our safety strategy; we believe the world will be best equipped to win at the team sport of AI resilience this way. 2. We believe

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TH
@theo
16h ago
Model Release

$5 per mil in, $30 per mil out. GPT-5.5 is smart. I've been using it for a bit. It's also weird, hard to wrangle, and too expensive IMO. Double the price of GPT-5.4. 20% more expensive than Opus 4.7. https://t.co/C8k68quwtw

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RE
@reach_vb
16h ago
Model Release

Fun fact: Codex + GPT-5.5 even helped optimize the serving stack behind GPT-5.5, increasing token generation speeds by over 20% 🤯 https://t.co/v7zIxCeGo7

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OP
@OpenAI
16h ago
Model Release

GPT-5.5 is rolling out today for Plus, Pro, Business and Enterprise users across ChatGPT and Codex. We’re also introducing GPT-5.5 Pro for Pro, Business, and Enterprise users in ChatGPT.

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OP
@OpenAI
16h ago
Model Release

In ChatGPT, full-stack inference improvements enable a more capable model at faster speed. This efficiency is a game-changer for GPT-5.5 Pro, now a much more practical option for demanding tasks, and a step change in the level of difficulty and quality of work ChatGPT can take on

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OP
@OpenAI
16h ago
Model Release

GPT-5.5 delivers this step up in intelligence without compromising on speed. GPT-5.5 matches GPT-5.4 per-token latency in real-world serving, while performing better across nearly every evaluation we measured. It also uses significantly fewer tokens to complete the same Codex h…

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OP
@OpenAI
16h ago
Model Release

GPT-5.5 excels at writing and debugging code, researching online, analyzing data, creating documents and spreadsheets, operating software, and moving across tools until a task is finished. The gains are especially clear in agentic coding, computer use, knowledge work, and early

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OP
@OpenAI
16h ago
Model Release

Introducing GPT-5.5 A new class of intelligence for real work and powering agents, built to understand complex goals, use tools, check its work, and carry more tasks through to completion. It marks a new way of getting computer work done. Now available in ChatGPT and Codex. htt…

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TH
@theo
16h ago
Announcement

My new cryptography puzzle is now live. Will pay $1,000 to the first person who DMs me the plaintext decryption of the first line. 2nd line is a hint. If you send me slop, AI hallucinations, or a decryption of the 2nd line, you are disqualified. https://t.co/p8qmYYRAIA https://…

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LM
@lmsysorg
18h ago
Announcement

🎉 Meet Hy3 preview from @TencentHunyuan , a 295B hybrid MoE (21B active) with 256K context. Day-0 support is now live in SGLang! → Strong reasoning: top results on FrontierScience-Olympiad, IMO-AnswerBench & GPQA Diamond → 256K context: big gains on CL-bench & LongBench …

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