LLM Tuner

LLM Tuner is a native macOS companion for developers, analysts, and researchers using OpenAI's API for fine-tuning custom models. Manage OpenAI fine‑tuning jobs and custom (fine‑tuned) models from one place: * Create fine‑tuning jobs by uploading training (and optional validation) files * Track status updates automatically with background polling * Get macOS notifications when jobs are completed or failed * View and manage your fine‑tuned models (including deleting models you no longer need) * Test fine‑tuned models with a lightweight chat playground (system prompt supported) Supports both Text and Vision Model Tuning: * Validate JSONL training files for required roles/messages and common issues * Vision fine‑tuning JSONL validation (multimodal content + embedded/base64 image checks) * Provides basic stats like counts, estimated tokens, and rough cost estimates Designed for macOS: * Dark Mode + Light Mode + System appearance support * Your OpenAI API key is stored securely in macOS Keychain Important notes: * LLM Tuner requires your own OpenAI API key and OpenAI account. * The app sends your requests (including any training/validation file contents you choose to upload) directly to the OpenAI API. LLM Tuner is an independent application and is not affiliated with, endorsed by, or sponsored by OpenAI. OpenAI and related marks are trademarks of OpenAI. OpenAI APIs and model names are provided under OpenAI’s terms and policies.