Sebastian Szewczyk @sebscode

Krakow, Poland Joined October 2014

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Claude @claudeai

7 days ago

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.

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Software Mansion @swmansion

a month ago

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

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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.' youtube.com/watch?v=tP4MGc…

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Sebastian Szewczyk @sebscode

a month ago

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. youtube.com/watch?v=7oO37G…

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Sebastian Szewczyk @sebscode

a month ago

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

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Sebastian Szewczyk @sebscode

2 months ago

@bcherny Love those tips! For iOS apps verification I've used Argent from @swmansion and today it released to the public argent.swmansion.com Really improves Claude consistency!

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Software Mansion @swmansion

2 months ago

Introducing Argent ⚙️ An agentic toolkit to control, debug, and profile the iOS Simulator 📱 👉 𝚗𝚙𝚡 @𝚜𝚠𝚖𝚊𝚗𝚜𝚒𝚘𝚗/𝚊𝚛𝚐𝚎𝚗𝚝 𝚒𝚗𝚒𝚝

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Software Mansion @swmansion

2 months ago

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

pFor @pFornagiel

2 months ago

Gotta admit, its fun watching an AI agent tap and swipe in an iOS app - even more when it gets a PR merged Had an idea developing @swmansion's Argent: cloned @bluesky, picked the first open issue, let it run in the background. Came back to a fix... and the PR merged next day!

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Sebastian Szewczyk @sebscode

2 months ago

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

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Sebastian Szewczyk @sebscode

3 months ago

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!