JevDev: Open-Source UI Tool for Experimenting with Jev (Typesafe.ai)

Melvin Vivas · X video post · 2026-10-02 · Open on X

Topics: AI Dev Tools & Productivity · Level: intermediate

Summary

Melvin Vivas shares v0.1.1 of JevDev, his open-source UI tool for experimenting with Jev by Typesafe.ai, which now supports themes. He also says GPT-6.1 Sol has become much faster than it was in previous days.

Key points

• JevDev is the creator's open-source UI for experimenting with Jev by Typesafe.ai.
• Version v0.1.1 adds themes.
• The creator says GPT-6.1 Sol is now noticeably faster than in previous days.
• The source code is at github.com/donvito/jev-dev.

Resources mentioned

• donvito/jev-dev · repo · github.com · free
  UI tool for experimenting with Jev by Typesafe.ai that keeps a history of past runs.
  Also in: Generating a Repo Promo Video with a Claude Skill on Sonnet 5.5 vs Opus 5.5 (Melvin Vivas on X · notes), jev-dev: A UI Tool to Keep Run History When Experimenting with Jev (Melvin Vivas on X · notes), JevDev: Open-Source UI for Experimenting with Jev by Typesafe.ai (Melvin Vivas on X · notes)
• Jev (TypeSafe AI) · tool · typesafe.ai · free
  TypeSafe's new post-training algorithm for calibrated, confidence-scored decisions, pitched as a replacement for RLHF.
  Also in: jev-dev: A UI Tool to Keep Run History When Experimenting with Jev (Melvin Vivas on X · notes), JevDev: Open-Source UI for Experimenting with Jev by Typesafe.ai (Melvin Vivas on X · notes), Building a Jev Session-History Tool with Codex and Astra (Melvin Vivas on X · notes), Model Routing: Fine-Tune Your Own Router on Your Prompts (Melvin Vivas on X · notes) and 7 more
• GPT-6.1 Sol · tool · openai.com · paid
  A new OpenAI model announced at DevDay 2026 (name as written in the machine transcript), offered with Fast and Ultra fast speed tiers.
  Also in: Comparing Coding Models on the Same Task in Devin iOS (Melvin Vivas on X · notes), Customizing Your Coding Setup with Pi Coding Agent Extensions (Melvin Vivas on X · notes), Pi Agent Council: Ask Multiple LLMs in Parallel and Compare Their Advice (Melvin Vivas on X · notes), GPT-6.1 and Sonnet 5.5 Released the Same Week (Melvin Vivas on X · notes) and 9 more

Try this

• Try JevDev v0.1.1 from the GitHub repo to experiment with Jev.