Simon Willison’s Weblog

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Sunday, 10th August 2025

the percentage of users using reasoning models each day is significantly increasing; for example, for free users we went from <1% to 7%, and for plus users from 7% to 24%.

Sam Altman, revealing quite how few people used the old model picker to upgrade from GPT-4o

# 11:09 pm / ai, openai, generative-ai, chatgpt, llms, llm-reasoning, sam-altman, gpt-5

Qwen3-4B-Thinking: “This is art—pelicans don’t ride bikes!”

Visit Qwen3-4B-Thinking: "This is art - pelicans don't ride bikes!"

I’ve fallen a few days behind keeping up with Qwen. They released two new 4B models last week: Qwen3-4B-Instruct-2507 and its thinking equivalent Qwen3-4B-Thinking-2507.

[... 991 words]

2025 » August

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