TL;DR: Mistral Medium 3.5 is a 128B open-weight model released April 29, 2026, with a 256K context window, configurable reasoning, and native multimodal input. It scores 77.6% on SWE-Bench Verified — close but not ahead of Claude Sonnet 4.6 — and ships alongside Vibe, a cloud coding agent that submits pull requests directly to GitHub without you babysitting it. API pricing is $1.50 per million inp
You know that feeling when your AI agent starts burning through your API budget at 3 AM and you only find out the next morning? Yeah, we've all been there. The observability space for LLM applications has exploded in recent years, but most platforms either lock you into their ecosystem or charge you per-token like it's liquid gold. Let's talk about building a real-time monitoring strategy that doe