not much happened today

**GPT-5.2** shows mixed performance in public evaluations, excelling in agentic tasks but at a significantly higher cost (~**$620/run**) compared to **Opus 4.5** and **GPT-5.1**. It performs variably on reasoning and coding benchmarks, with some improvements on long-context tasks. Extended "reasoning effort" settings notably impact results. Aggregators rank **Gemini 3 Pro** above GPT-5.2 in task persistence. **OpenAI** released sparse activation models sparking debate on sparsity vs MoE architectures. **Allen AI**'s **Olmo 3.1 (32B)** advances open reinforcement learning scale with substantial compute investment (~**125k H100 hours**). **Mistral**'s Devstral-2 and **llama.cpp** improve local inference infrastructure with new features like GGUF support and distributed speedups. **Tinker** platform goes GA with vision input and finetuning support for **Qwen3-VL-235B**.