OpenAI o-series – reasoning models lineage explained
OpenAI's o-series is the company's line of reasoning models: systems built to spend compute thinking through a problem before they answer, rather than producing the most fluent…
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Reasoning
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DeepSeek – the open reasoning model lab
DeepSeek is a Chinese AI lab, founded in 2023 and based in Hangzhou, that released an open-weight reasoning model called DeepSeek-R1 in January 2025 and claimed it was trained for…