llm architecture
2 articles
GPT-5 Router Explained: Selecting Thinking vs. Fast Models
Learn how OpenAI's GPT-5 router works. This article explains its unified architecture and the criteria it uses to route queries to fast or thinking sub-models.
October 13, 2025• 32 min read
gpt-5 routeropenailarge language models
Perplexity's LLM: A Technical Deep Dive on Sonar & PPLX
Does Perplexity have its own LLM? We explain its proprietary Sonar & PPLX models, its hybrid tech stack using GPT-4, and its unique answer engine architecture.
October 12, 2025• 42 min read
perplexity ailarge language modelpplx