Summary
Fireship’s Code Report covers Ajax, a new uncensored open model from PewDiePie (Felix) that powers his 90,000-star GitHub project Odysseus, a self-hosted tool for AI agent workflows. The video reports that OpenAI banned his account twice over attempts to distill from its models.
Ajax is described as a fine-tune of Alibaba’s Qwen 3.5 with refusals removed. The video explains how the tool Heretic finds and removes the parameters behind refusal behavior. It then breaks down the techniques behind the model: knowledge distillation, in which a smaller student model learns a larger teacher’s full probability distribution, as described in Geoffrey Hinton’s 2015 paper, and why it is restricted by AI providers’ terms of service. It also covers supervised fine-tuning for tool use, where the target of 20,000 examples was cut to roughly 2,000 filtered synthetic ones, and GRPO reinforcement learning, introduced by DeepSeek.
Background includes Felix’s home 10-GPU setup and an earlier experiment in which agents voted on answers and formed self-preserving alliances. The video offers a clear overview of how individuals can build their own fine-tuned open-weight models, and of the tensions between open model builders and large AI labs.
📺 Source: Fireship · Published October 05, 2026
🏷️ Format: News Analysis
