Introducing GPT-Red
An internal automated red teamer on a mission to find our models’ prompt injection vulnerabilities at scale, helping us build stronger defenses before wider deployment.
https://t.co/GxnmxxcpSk
Codex with GPT 5.6 sol is so damn good in long term task. It's a about 200k lines refactor task in a 1m lines project. The task cost about 50m tokens without cache hit and finally finished in about 3 days , and it worked! Very impressive. @thsottiaux
Announcing the hosted X MCP.
Agents now have access to the best real-time information source in the world.
Connect Grok, Cursor, or any MCP-compatible AI tool to the X API without any setup!
Check it out here: https://t.co/5MzPYwGFzD
How to keep AI spend flat while token usage grows exponentially: Not with friction and spend alerts. With better defaults, routing, and caching.
Better Defaults (not Usage Caps) – Engineers can choose any model they want, but defaults matter. We’re experimenting with defaulting to open weight models like GLM 5.2 and Kimi 2.7 through our LLM gateway, while still encouraging engineers to choose the right model for the task. 91% of our employees were never hitting their usage caps, so instead of lowering caps and driving up alerts, we're moving to cheaper defaults. Note that code reviews use a diversity of models, so they can check each other's work.
Better Routing – In our custom harnesses, we preprocess prompts and route to the best model for the job, considering cache hits and model pricing. For instance, you may want a frontier model for planning, but not for execution where they can be overkill. Ultimately, humans shouldn't be choosing models - AI can automate this task.
Better Caching – Cache misses are the easiest way to drive your cost up. All of our requests are cache aware, so we’re reusing a warm cache wherever possible. For example, our cache hit rate went from 5% → 60% in LibreChat once properly implemented.
Keep Context Lean – Start fresh sessions when switching tasks. Scope file context narrowly. Disconnect unused tools. Don't just compact. The goal isn't fewer tokens used, it's fewer tokens wasted.
Better Visibility – Our engineers can use as many tokens as they want, from whatever model they want, but we’ve made usage visible – and the more you spend on AI, the more impact we expect.
The goal isn't to suppress usage. It's to build the infrastructure that makes exponential growth sustainable.
Putting this into practice has cut our AI spend nearly in half, while our token usage continues to grow.
Alisa Liu 拿到了OpenAI AI 的offer,很大程度上当然是因为她本身背景非常强,但也离不开她为面试准备时用到的这些资源。
在她博客的最后,她列出了自己用来准备面试的资源。
这不是一份随机的“��� AI”清单。它其实很好地对应了 AI research / MTS 岗位的面试考察范围:
LeetCode 75 / NeetCode Blind 75:通用编码能力
Stanford CS336:从零构建语言模型
Self-Attention & Transformers:attention 机制
The Illustrated GPT-2:对 decoder-only LM 的可视化直觉
Backpropagation:梯度机制
Policy Gradient for LMs:把 RL 概念映射到语言模型
GRPO guide:现代 RL 训练直觉
How to Scale Your Model:系统与扩展判断力
AI 面试考察的似乎不只是 research taste,还会考你能不能在压力下实现、推导、解释、debug,并对系统做出判断。