OpenAI released GPT-5.4 mini ($0.75/$4.50 per M tokens) and GPT-5.4 nano ($0.20/$1.25), with nano undercutting Gemini 3.1 Flash-Lite on price. GPT-5.4 nano outperforms the old GPT-5 mini at max reasoning effort and is notably cheap — Simon Willison calculates describing his 76,000-photo library would cost ~$52. The article includes a practical benchmark comparing all three new 5.4 models across five reasoning effort levels.
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GPT-5.4 mini and GPT-5.4 nano, which can describe 76,000 photos for $52
OpenAI's GPT-5.4 nano hits $0.20/M tokens, making large-scale batch operations commodity-priced—processing a 76,000-photo library costs just $52.
Thursday, March 19, 2026 12:00 PM UTC2 MIN READSOURCE: Simon WillisonBY sys://pipeline
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