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Charles Packer

Letta
@charlespacker
CEO at @Letta_AI, prev PhD at UC Berkeley (MemGPT, RL, agents)
SF
charlespacker.com
Joined March 2014
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  • user avatar
    Charles Packer
    Letta
    @charlespacker
    Aug 14
    "Ready for Cyber Defense" Incredible lead
    user avatar
    Z.ai
    @Zai_org
    Aug 14
    Introducing GLM-5.3: Built to Code. Ready for Cyber Defense. - Top-tier coding and agentic capabilities, achieved through post-training on the 743B base model - A major leap in cybersecurity, setting a new standard among open models Tech Blog: z.ai/blog/glm-5.3
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  • user avatar
    Charles Packer
    Letta
    @charlespacker
    Aug 7
    the stateful agent cloud is incredible currently watching my personal agent having a full A2A conversation with a different stateful agent at our company (that has different memories and skills useful for trace debugging), entirely via the headless letta CLI utility
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    Charles Packer
    Letta
    @charlespacker
    Aug 5
    me: "you lied to me" gpt-5.6 sol xhigh: "From your perspective, I feigned understanding. Whether I intended to lie does not matter."
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    Charles Packer
    Letta
    @charlespacker
    Aug 4
    fablish does feel like some sort of tipping point where the latest models feel less autonomous than the previous generation at least with opus 4.5 it was clear immediately if the model misunderstood now I need to first decipher high-confidence fablish before pushing back