Sebastian Szewczyk

[Claude @claudeai]

Introducing Claude Fable 5: a Mythos-class model that we’ve made safe for general use.

Its capabilities exceed those of any model we’ve ever made generally available.

[Software Mansion @swmansion]

⚛️ Learn how Argent improved AI workflows at Software Mansion, helping our engineers cut re-renders and render times on real production apps.

[Sebastian Szewczyk @sebscode]

11/ The capability curve (Alex Albert)

SWE-Bench Verified: 62% (Sonnet 3.7) → 87% (Opus 4.7).

Each generation, *simplify* — strip scaffolding built around old models.

'Boost performance by removing instead of adding.'

https://t.co/WsOnrqjmKd

[Sebastian Szewczyk @sebscode]

Code with Claude 2026 wrapped this week. All 11 talks, with links and a one-line takeaway each.

[Sebastian Szewczyk @sebscode]

10/ Getting more out of the Claude Platform (Brad Abrams)

Four core techniques: prompt caching (90% input discount; cached tokens don't count vs. rate limits), Tool Search Tool (lazy-load tools), programmatic tool calling, compaction.

https://t.co/Dxw7OOJs7v

[Sebastian Szewczyk @sebscode]

@bcherny Love those tips! For iOS apps verification I've used Argent from @swmansion and today it released to the public https://t.co/OmeJGLCg4G
Really improves Claude consistency!

[Software Mansion @swmansion]

Introducing Argent ⚙️

An agentic toolkit to control, debug, and profile the iOS Simulator 📱

👉 𝚗𝚙𝚡 @𝚜𝚠𝚖𝚊𝚗𝚜𝚒𝚘𝚗/𝚊𝚛𝚐𝚎𝚗𝚝 𝚒𝚗𝚒𝚝

[Software Mansion @swmansion]

Argent, our new mobile toolkit for AI Agents, is coming veeery soon 🔥

[Sebastian Szewczyk @sebscode]

@yusuff_again Thanks for your feedback! I'm working on making simulators more powerful 💪

[Sebastian Szewczyk @sebscode]

The most illegal feeling thing I’ve ever built.

I can now feel if my SwiftUI haptic logic is correct without ever looking at a physical iPhone. Testing the Success vs Error patterns just by resting my hand on my Mac or Magic trackpad.

Let me know what you think!

[Sebastian Szewczyk @sebscode]

@_atilla1 I’ll let you know once it’s available.

[Sebastian Szewczyk @sebscode]

@applewhite_hx I will probably publish it at some point, still tweaking it to provide more value