This week's edition of my email newsletter features 4 pelicans riding bicycles, 1 possum on an e-scooter, up to 5 raccoons with ham radios hiding in crowds, 5 blog posts, 8 links, 3 quotes and a new chapter of my Agentic Engineering Patterns guide https://
simonw.substack.com/p/gpt-55-chatg
pt-images-20-qwen36-27b
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LLMS
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Newsletter Covers GPT-4.5, ChatGPT Images, Qwen3 and Agentic Patterns
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DeepSeek v4 Pro Added to Playable Gallery
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Here's DeepSeek v4 Pro. Added to the playable gallery as well. https://t.co/foIqZakU9p pic.twitter.com/wpQ8kj9AAT
— Ethan Mollick (@emollick) 24 avril 2026Here's DeepSeek v4 Pro. Added to the playable gallery as well.
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Reflection on o3 and initial 5 router fiasco
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I would love to hear more on why you think this some time. I loved o3 (and posted about lot about it!) but initial 5 was IMO a dud, especially the router fiasco. I’m happy to admit there’s been great progress since then though.
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Standard and Ultra High Context Efficiency in LLMs
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1m Standard and ultra high context efficiency is what me excites me
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First TiKZ Sparks unicorns from DeepSeek v4
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My first two TiKZ Sparks unicorns from DeepSeek v4. (Expert mode, from the DeepSeek site, which is supposed to be v4 Pro according to the release)
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DeepSeek v4 Matches GPT-5.4 Performance at Lower Prices
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Holy… isn’t DeepSeek v4 basically giving GPT-5.4 xhigh performance at GPT-5.4 mini prices?
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DeepSeek Outshines OpenAI’s GPT-5.5 Release Strategy
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Did Deepseek really wait until OpenAI released GPT-5.5 to steal the show?
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DeepSeek-V4-Pro Becomes Fastest Model to HF Trending
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500+ likes in 28 mins. On their way to be the fastest model ever to get to #1 trending on HF! https://
huggingface.co/deepseek-ai/De
epSeek-V4-Pro
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AI Model Upgrade Expected to Improve Bot Comments
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I hope the upgrade to DeepSeek v4 will make the bot comments on here more bearable.