The Innovative Nano Model and the Lore of AI Development

We’ll keep this brief because we’re on a tight turnaround: GPT 4.1, previously known as the Quasar and Optimus models, is now live as the natural update for 4o/4o-mini (and the research preview of GPT 4.5). Though it is a general purpose model family, the headline features are:

Coding abilities (o1-level SWEBench and SWELancer, but ok Aider)

Instruction Following (with a very notable prompting guide)

Long Context up to 1m tokens (with new MRCR and Graphwalk benchmarks)

Vision (simply o1 level)

Cheaper Pricing (cheaper than 4o, greatly improved prompt caching savings)

We caught up with returning guest Michelle Pokrass and Josh McGrath to get more detail on each!