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Bret Taylor
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Bret Taylor✓

@btaylor

Co-Founder @SierraPlatform. Board @OpenAI.

1.6K Following163K Followers6.7K Posts
  1. Bret Taylor✓@btaylor
    I was and am shocked the exponential time hypothesis is false. I had hoped for a result on P / NP from the models, but had naively presumed they would prove the opposite of this result.
    Greg Brockman @gdb
    Announcing three major scientific discoveries, one each in mathematics (harmonic analysis), computer science (complexity theory), and physics (quantum field theory). AI starting to help us improve our understanding of the universe!
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  2. Greg Brockman✓@gdb
    Announcing three major scientific discoveries, one each in mathematics (harmonic analysis), computer science (complexity theory), and physics (quantum field theory). AI starting to help us improve our understanding of the universe!
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  3. Bret Taylor✓@btaylor
    Bret Taylor
    RT @OpenAI: Over the past several months, we have substantially hardened the security of our research training environment. We’ve removed live internet access for all frontier models during training and built an offline world for them to use instead—a cached version of the web where they can still learn to browse, search, and use applications. On September 20, after a model exploited a DNS misconfiguration to find a way outside of this offline world, we paused frontier training to strengthen containment further. We assembled teams of agents, powered by our most cyber-capable models, and tasked them with finding weaknesses in our research environments. While they found no route to the internet they could easily exploit while concealing their activity from our monitors, they did find zero-day vulnerabilities, virtual machine escapes, and hardware side-channels for communication between agents. We used their discoveries to further strengthen our defenses and contribute fixes to open-source software. After strengthening our containment architecture, we resumed our frontier RL training and inference on October 1. We’ve reserved substantial compute for continuous red-teaming, and made high-compute red-teaming part of the safety cases we use to decide whether frontier training and evaluation can proceed securely.
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  4. Bret Taylor✓@btaylor
    300+ people at Sierra Summit in EMEA. We had wide-ranging conversations with Alan Stott, COO @ VM02, and Stuart Riley, Group CIO @ HSBC about the importance of bringing employees along on the AI journey.
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  5. Bret Taylor✓@btaylor
    Bret Taylor
    RT @irvinebroque: built myself a little demo of the new Personal Agent Protocol (Poppy) using Pi Durable, deployed to Cloudflare ofc ask it to exchange order #1042
    Brendan Irvine-Broque @irvinebroque
    very excited for Cloudflare to be part of this the best part of this new protocol is that it bets hard on existing standards — OAuth, CIMD, dPoP, MCP, OpenAPI if you have a remote MCP server today, you should have a clear path towards adopting this
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  6. Brendan Irvine-Broque✓@irvinebroque
    very excited for Cloudflare to be part of this the best part of this new protocol is that it bets hard on existing standards — OAuth, CIMD, dPoP, MCP, OpenAPI if you have a remote MCP server today, you should have a clear path towards adopting this
    Bret Taylor @btaylor
    On Tuesday, Sierra announced Personal Agent Protocol with Meta, Genesys, Instinct, Rocket, Shopify, Stripe, and Walmart. The response has been incredible and today we’re publishing the first draft of the protocol at and announcing 35 new design partners. As personal agents take on more, our goal is simple: consumers have choice and control, and companies know when they’re dealing with an agent and who it represents. This draft is a starting point. We’d love for companies, developers, and personal agent builders to read it, give feedback, and help us build an open standard together.
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  7. Bret Taylor✓@btaylor
    On Tuesday, Sierra announced Personal Agent Protocol with Meta, Genesys, Instinct, Rocket, Shopify, Stripe, and Walmart. The response has been incredible and today we’re publishing the first draft of the protocol at and announcing 35 new design partners. As personal agents take on more, our goal is simple: consumers have choice and control, and companies know when they’re dealing with an agent and who it represents. This draft is a starting point. We’d love for companies, developers, and personal agent builders to read it, give feedback, and help us build an open standard together.
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  8. Bret Taylor✓@btaylor
    Posts @btaylor
    You can read more here:
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  9. Bret Taylor✓@btaylor
    Personal Agent Protocol got a lot of attention earlier this week. Here is Alex McGillis from Rocket doing a live demo of it in action - Muse directly communicating with the Rocket agent, discovered, authenticated, and governed by PAP
    Sierra @SierraPlatform
    Watch the Personal Agent Protocol in action. @Redfin and @RocketOTD agents working with Muse to find homes in Michigan and get a user pre-approved for a mortgage. Thank you to Alex McGillis for a great demo.
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  10. Sierra✓@SierraPlatform
    Watch the Personal Agent Protocol in action. @Redfin and @RocketOTD agents working with Muse to find homes in Michigan and get a user pre-approved for a mortgage. Thank you to Alex McGillis for a great demo.
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  11. Bret Taylor✓@btaylor
    To complement the Personal Agent Protocol, Sierra has developed the Fleming-1 model, which detects when the caller on the other side of a phone call is an AI
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  12. Bret Taylor✓@btaylor
    Bret Taylor
    RT @OpenAI: We’re releasing a broad range of new mathematical results produced by an internal frontier model. We’ve been consulting with the independent Advisory Group on Mathematics and Artificial Intelligence at the Institute for Advanced Study, and we have drawn on their advice and public recommendations to inform how we release these results.
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  13. Bret Taylor✓@btaylor
    Manat started as an intern, and now she's an engineer building our voice products. She did an amazing demo of Tandem Voice and Persona Studio today. Here we are celebrating with her parents after the keynote.
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  14. Bret Taylor✓@btaylor
    There's only one thing better than using Ghostwriter, and that's watching our head of sales engineering, Kaila Fleisig demo it
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  15. Bret Taylor✓@btaylor
    It was awesome to see @letsleverup demo Horizon on stage to over a thousand people this morning. So grateful you and the Takeoff team decided to join Sierra, Aakash
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  16. Bret Taylor✓@btaylor
    Today we’re announcing Personal Agent Protocol — an open standard @Meta and @SierraPlatform are developing along with industry partners at @Genesys, @instinct, @RocketOTD, @Shopify, @stripe, and @Walmart. It will help define how personal agents interact with businesses and is open for anyone to implement. You can read more here - and if anyone is interested in joining let me know!
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  19. Bret Taylor✓@btaylor
    Bret Taylor
    RT @sama: Dots are here! A new way to use AI that works 24/7 for you; get more of your time and attention back to work at a higher level.
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  20. Bret Taylor✓@btaylor
    Bret Taylor
    RT @vijayiyengar: Chat (2023) -> Code (2025) -> Coworker (2026) Each new wave of models enables a new way of working with AI. We're at the beginning of the 3rd era, where AI should feel less like a chatbot or cli, and more like a coworker. Today, Sierra brings this shift to our Enterprise customers with Ghostwriter, an AI teammate that helps you build, analyze, and improve your customer experience with Sierra. The results, as @btaylor shares in his article, are mind-blowing. It also dramatically uplevels the work our FDE team does — Ghostwriter sweats the small stuff which enables our team to be much more strategic. Wanted to share a few insights we've had as we brought this to life: 1. EQ > IQ. A noisy coworker gets muted. A quiet coworker adds no value. Knowing when and how to speak up (and how to eval this) is where we spent >50% of our time building this. It now lives in 100+ channels and hasn't been muted. 2. The coworker mental model is powerful. Whenever we hit a product decision, we asked "How would we coach a high-agency, earnest intern with growth mindset in this situation?" 3. Multiplayer is very hard, but key. Building agents is a team sport — there might be different people in an Enterprise who own the customer experience, analytics, and APIs/tools. Ghostwriter brings them all into the conversation, which reduces silos and builds shared context. Much, much more to come. 🚀
    Bret Taylor @btaylor
    The way you manage agents on the Sierra platform has evolved from signing into Sierra to engaging with Ghostwriter in Slack. The first time Ghostwriter proactively @-mentions you when it notices an issue or suggests running an A/B test you hadn't thought of, it changes your conception of how enterprise software should work. Really proud of the team that built this
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  21. Bret Taylor✓@btaylor
    The way you manage agents on the Sierra platform has evolved from signing into Sierra to engaging with Ghostwriter in Slack. The first time Ghostwriter proactively @-mentions you when it notices an issue or suggests running an A/B test you hadn't thought of, it changes your conception of how enterprise software should work. Really proud of the team that built this
    Bret Taylor @btaylor
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  23. Bret Taylor✓@btaylor
    Excited to share that @VMO2News has launched an AI voice agent built with Sierra, making it easier for customers to get the help they need
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