For the past few weeks, I've been playing with gpt-5.6-luna. It is shockingly capable, fast, and smart. I regularly see it do ~100 tps, and rip around my codebase, email, and knowledge base.
GPT-5.4 Pro costs $30/M input and $180/M output via OpenAI, or ~$24/$144 with ofox's 20% Pro Plan discount. Scores 75% on OSWorld and 89.3% on BrowseComp for agentic tasks.