Larry Lv

Post-Training @OpenAI. Training GPT-5.x Thinking models.
// If I blocked you, blame my bot.

[OpenAI @OpenAI]

Introducing a limited preview of GPT-5.6 Sol, our next generation frontier model, as well as GPT-5.6 Terra, a balanced model for efficient, everyday work, and GPT-5.6 Luna, a fast and affordable model for high-volume work.

https://t.co/OoM83SyISN

[Noam Shazeer @NoamShazeer]

I’m excited to share that I’ll be joining OpenAI and look forward to working with the exceptional team there.

It was a difficult decision to move on. I’m incredibly proud of the amazing team at Google and everything we’ve built together. It has been an honor and a pleasure to work with all of you.

[Sam Altman @sama]

Here is our current plan for OpenAI:

https://t.co/r29FUUee3A

[OpenAI @OpenAI]

OpenAI frontier models and Codex are now generally available on AWS, giving enterprises a new way to build on Amazon Bedrock with OpenAI through the security, compliance, and governance workflows they already use.

This is also the beginning of a broader expansion of OpenAI capabilities on AWS, including future availability for cybersecurity capabilities like Daybreak.

https://t.co/vMws0YU6Q3

[Matt Turck @mattturck]

Why AI Progress Suddenly Feels Real - my conversation with @yanndubs, who co-leads the Post-Training Frontiers team at @OpenAI

00:00 - Intro

01:30 - Why recent AI progress feels like a step function

04:13 - Model reliability & the emotional rollercoaster of shipping GPT-5.5

07:33 - How OpenAI structures vertical and horizontal teams

09:49 - Improving model efficiency and test-time compute

12:32 - Yann's journey from Switzerland to OpenAI

15:37 - Reasoning in 2026: Real-world utility vs verifiable rewards

18:34 - GPT-5.5 Thinking vs Pro: Scaling test-time compute

20:09 - How reasoning models become more efficient

23:23 - Pre-training scaling and overcoming the data wall

27:03 - Multimodal data, synthetic data, and embodied AI

31:05 - Demystifying mid-training and post-training

37:21 - Does RL create new capabilities in AI?

38:53 - The challenges and frontier of scaling RL

43:09 - Is building AI models a craft or a strict science

48:21 - How AI models generalize across different domains

54:18 - How reinforcement learning cures AI hallucinations

56:04 - Negative generalization and conflicting instructions

58:05 - Can RL scale to law, medicine, and the broader economy?

1:00:19 - The evaluation bottleneck and Model as a Judge

1:04:21 - Continuous AI progress & continual learning

1:08:49 - Will foundation models eat the agent harness

1:11:23 - Why startups should focus on the last mile of AI

[Larry Lv @larrylv]

build with us 🙌

[OpenAI @OpenAI]

Just gonna leave this here.

https://t.co/EOI980j9e9

[Larry Lv @larrylv]

@LiuZuxin Zuxin bot is the real 🐐

[Larry Lv @larrylv]

We have been working on this model for a while. Glad to see it's finally out!

[OpenAI Developers @OpenAIDevs]

GPT-5.5 reaches state-of-the-art results across key evals for agentic coding, computer use, tool use, advanced math, and cybersecurity tasks.

82.7% on Terminal-Bench 2.0
78.7% on OSWorld-Verified
55.6% on Toolathlon
35.4% on FrontierMath Tier 4
81.8% on CyberGym

[Larry Lv @larrylv]

@ericmitchellai Thank you Eric 🐐

[dax @thdxr]

our team's model usage breakdown for the past 7 days
gpt has really taken over

[Larry Lv @larrylv]

> in the course of days, of multiple runs, with the same tools at disposal, GPT 5.4 was able to made *all* the progresses, and Opus only minor things.

👏👏

[antirez @antirez]

During the last week I executed very long autonomous sessions of Claude Code Opus 4.6 and Codex GPT 5.4 (both at max thinking budget), in cloned directories (refreshed every time one was behind). I burned a lot of (flat rate, my OSS free account + my PRO account) of tokens...

[Larry Lv @larrylv]

@_lopopolo bruh

[Larry Lv @larrylv]

love seeing this

[Cursor @cursor_ai]

We're sharing a new method for scoring models on agentic coding tasks.

Here's how models in Cursor compare on intelligence and efficiency:

[Larry Lv @larrylv]

@thdxr 🤝

[Larry Lv @larrylv]

@_adiganesh 🙏

[Larry Lv @larrylv]

GPT-5.4 is here! It was fun training this one with so many wonderful colleagues.

[OpenAI @OpenAI]

GPT-5.4 Thinking and GPT-5.4 Pro are rolling out now in ChatGPT.

GPT-5.4 is also now available in the API and Codex.

GPT-5.4 brings our advances in reasoning, coding, and agentic workflows into one frontier model.

[Larry Lv @larrylv]

🦄

[Sebastien Bubeck @SebastienBubeck]

GPT-5.4

[Larry Lv @larrylv]

Happy Gullible Day to whoever celebrates it.

[Mitchell Hashimoto @mitchellh]

I know this is pretty well established at this point, but Codex 5.3 is a much more effective model than Opus 4.6. I went back and forth on both for a bit, but haven’t touched Opus at all now for a full week. First model to get me off of Opus… ever. Good job Codex team.

[Larry Lv @larrylv]

@mimighost008 @cherylnatsu 感谢反馈 📝