# LocalAI v4.1.0 — Release & Upgrade Intelligence
- **Product:** LocalAI (https://localai.io)
- **Version:** v4.1.0
- **Released:** Apr 02, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/localai/updates/v4.1.0/

## Executive Summary (TL;DR)
LocalAI v4.1.0. Source highlight: 🎉 LocalAI 4.1.0 Release! 🚀

## New Features
- feat(ui, gallery): Show model backends and add searchable model/backend selector
- feat: add users and authentication support
- feat(ui, openai): Structured errors and link to traces in error toast
- feat(ui): Add model pipeline editor
- feat: add (experimental) fine-tuning support with TRL
- feat(ui): add predictor for usage, user-breakdown statistics

## Improvements
- **llama.cpp Portability:** Bundled `libdl`, `librt`, `libpthread` for improved cross-platform support.
- **API Improvements:** Proper 404s for missing models, unescaped model names, unified inferencing paths with automatic retry on transient errors.
- chore(workers): improve logging, set header timeouts

## Bug Fixes
- **Admin Powers:** Admins can impersonate users for debugging.
- **Per-Model Backend Logs:** Drill into logs scoped to individual models for laser-focused debugging.
- **Streaming Tool Calls:** Agent mode tool calls now stream in real-time, with interleaved thinking fixed.
- **Intel SYCL Fix:** Auto-disables `mmap` for SYCL backends to prevent crashes.
- **Embeddings:** Implemented `encoding_format=base64` for the embeddings endpoint.
- **Kokoro TTS:** Fixed phonemization model not downloading during installation.