The conference for the agentic era. September 17th–18th, 2026. Warsaw, Poland. Hosted by @callstackio.
Joined August 2016
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Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
We believe in domain-specific models and domain-specific harnesses. At Callstack, we've been investing in both.
Excited to bring you the first piece of a broader family we're building. More to come!
Announcing Apex: agentic coding model for mobile and web, specialized in React.
We built Apex from a single idea: can an open-weight model deliver frontier-level performance at lower cost?
Yes. Apex is SOTA in React Native and Next.js.
Try it now: apex.callstack.com
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
Last week, our colleagues Andoni Santamaria and Felipe Ugena attended @AgentConf in Warsaw.
🔹 Specialized models
🔹 Multi-agent coordination
🔹 Observability
🔹 Production-ready agentic systems
and more!
@callstackio
plainconcepts.com/agent-conf…
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
Had a great time at @AgentConf with @svennergr talking about how @grafana’s Agent Observability can help us, and everyone else building agents 🫵, build agents they can trust.
The video is out now! 🎥👇
youtu.be/XvgprsJDo3o?si=AqmC…
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
How does quantization affect APEX performance? 🔬
Artur Morys-Magiera @artus9033 and I shared our research at @AgentConf . We hope our findings help the community make more informed decisions about quantization.
🎥 youtu.be/XLoY8PpYXNU
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
All talks from @AgentConf are live on YouTube.
Here's the full playlist: youtube.com/playlist?list=PL…
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
I talked at @AgentConf 2026 last Friday.
Six years of harness engineering, trying to push models beyond their capability, gives us a bit of insight of where things will go next.
In the end of the talk, I attempt to answer how we'll prompt AGI based on where we're heading right now.
The talk is now available on YouTube, enjoy :)
youtube.com/watch?v=63_KrfUY…
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
You can run a Terra-capable model with ~17GB RAM.
Measured on Apex on DGX Spark, @LeSiOO and @artus9033 got 3.4x decode speed at 27% of the initial model size with IQ4_XS quantization.
At 99.6% mean normalized MMLU and tool use score, and 92% token agreement, I'd take it.
How does quantization affect APEX performance? 🔬
Artur Morys-Magiera @artus9033 and I shared our research at @AgentConf . We hope our findings help the community make more informed decisions about quantization.
🎥 youtu.be/XLoY8PpYXNU
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
What would you build if you stopped worrying about tokens?
In the @AgentConf keynote: how we went from chatting with agents to running software factories.
We train, evaluate, and self-host our model Apex for a team of 200+. SOTA on React Native. Used daily for everything else.
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
My talk Build an Agent with Eve: The Open Agent Framework from AgentConf is available to watch:
youtube.com/watch?v=uVRmSOpi…
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
344 runs. 25 days. Quantization is humbling 😅
Apex-31B BF16: 57% → 86.5% MMLU after fixing the chat template + eval harness. Same weights. Same 400 questions. 🤯
Then the payoff: IQ4_XS gave us 3.4× decode throughput and a 73% smaller file vs BF16 on DGX Spark. 🚀
@artus9033 and I talked about all of this at @AgentConf , organized by @callstackio.
For me, it’s already one of the most exciting AI conferences in Poland! 🇵🇱🔥
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
Demo + small XState library coming soon (traveling back from @AgentConf where they got an early demo preview)
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
So grateful to speak with so many @c15tdev users at @AgentConf and talk about our code scanning tools and upcoming c15t v3.
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
coming back from @AgentConf with one message from @levan that really resonates with me.
thank you guys for the great conversations, all the good energy, and the kind words about @megadevhq
see ya!
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
Closing panel with @watchful_toast @watchful_toast, Grzegorz Wołodko @callstackio, Carl Ross @OpenAIDevs, hosted by Chris Trag @AmazonAppDev
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
Amazing meeting @watchful_toast from @okthinkai at @AgentConf. ❤️
Smart ideas, genuine energy, and one of those conversations you keep thinking about after.
Learn. Connect. Build. Repeat. 🚀
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
Build Flappy Apex with Apex and then made Jev play it. All happening at @callstackio booth on @AgentConf
Agent Conf | Sept 17-18, 2026 | Warsaw retweeted
That’s Jev playing Floppy Apex, passing the previous best score and not thinking of stopping anytime soon 🏆
It was wired up by Apex via Appduct, with some adjustments made in Fable.
@AgentConf