I gave Gemini 4 Carbon a PRD for a Jarvis-style voice assistant that controls my computer, and it built the whole thing on its own in about four and a half hours. It never stopped to ask me anything. You say “hey LiveKit,” tell Jarvis what you want, and it clicks, types, and fills in forms, but it asks for a yes before it submits anything.
Carbon was only the builder. Jarvis runs on LiveKit Inference, with Gemma 4 for the conversation and other models for vision, speech-to-text and text-to-speech. Carbon tested it without a microphone by generating speech and playing it in, and it fixed the vision model’s click offset on its own.
👉 LiveKit voice AI quickstart: https://docs.livekit.io/agents/start/voice-ai-quickstart/?utm_source=youtube&utm_medium=organicsocial&utm_campaign=jesse-hall
I also gave Carbon, Gemini 4 Argon and Claude Opus 5.5 two real LiveKit Agents bugs, then had all three review the code for the voice agent on our homepage. Carbon found the most serious issue in the security review. Opus was faster on both bug fixes.
Then I had all three review the code for the voice agent on our homepage for security vulnerabilities, and a judge LLM checked every finding. None of them made up an issue. Carbon and Argon each found 6 real issues, and Opus found 5. Carbon’s top finding was a bug in the framework, the most serious issue any of them found, and Argon and Opus both missed it. We reported it and it’s fixed. Carbon did rate most of its findings as more severe than they were. Opus’s severity ratings were the closest to ours.
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👀 Watch Next:
Playlist: Web Development For Beginners – https://www.youtube.com/watch?v=Ez4yHS2dsN8&list=PLkwxH9e_vrAJ0WbEsFA9W3I1W-g_BTsbt
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