Simon Willison on Nostr: My notes on the GPT-4.1 series so far - 1m tokens (across all three models) and ...

My notes on the GPT-4.1 series so far - 1m tokens (across all three models) and GPT-4.1-nano being their cheapest model yet are particularly notable https://simonwillison.net/2025/Apr/14/gpt-4-1/