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Tag: o3

  • Simon Willison’s Weblog: GPT-5 has a hidden system prompt

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    Kurt Seifried
    in

    Source URL: https://simonwillison.net/2025/Aug/15/gpt-5-has-a-hidden-system-prompt/#atom-everything Source: Simon Willison’s Weblog Title: GPT-5 has a hidden system prompt Feedly Summary: GPT-5 has a hidden system prompt It looks like GPT-5 when accessed via the OpenAI API may have its own hidden system prompt, independent from the system prompt you can specify in an API call. At the very least…

  • Simon Willison’s Weblog: GPT-5: Key characteristics, pricing and model card

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    by

    Kurt Seifried
    in

    Source URL: https://simonwillison.net/2025/Aug/7/gpt-5/#atom-everything Source: Simon Willison’s Weblog Title: GPT-5: Key characteristics, pricing and model card Feedly Summary: I’ve had preview access to the new GPT-5 model family for the past two weeks, and have been using GPT-5 as my daily-driver. It’s my new favorite model. It’s still an LLM – it’s not a dramatic departure…

  • Simon Willison’s Weblog: OpenAI’s new open weight (Apache 2) models are really good

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    Kurt Seifried
    in

    Source URL: https://simonwillison.net/2025/Aug/5/gpt-oss/ Source: Simon Willison’s Weblog Title: OpenAI’s new open weight (Apache 2) models are really good Feedly Summary: The long promised OpenAI open weight models are here, and they are very impressive. They’re available under proper open source licenses – Apache 2.0 – and come in two sizes, 120B and 20B. OpenAI’s own…

  • Slashdot: OpenAI Releases First Open-Weight Models Since GPT-2

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    Kurt Seifried
    in

    Source URL: https://slashdot.org/story/25/08/05/1848236/openai-releases-first-open-weight-models-since-gpt-2?utm_source=rss1.0mainlinkanon&utm_medium=feed Source: Slashdot Title: OpenAI Releases First Open-Weight Models Since GPT-2 Feedly Summary: AI Summary and Description: Yes Summary: OpenAI’s release of two open-weight language models, gpt-oss-120b and gpt-oss-20b, marks a significant development in the AI landscape since 2019. These models enable local deployment on consumer devices and introduce advanced capabilities such as…

  • Simon Willison’s Weblog: XBai o4

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    Kurt Seifried
    in

    Source URL: https://simonwillison.net/2025/Aug/3/xbai-o4/#atom-everything Source: Simon Willison’s Weblog Title: XBai o4 Feedly Summary: XBai o4 Yet another open source (Apache 2.0) LLM from a Chinese AI lab. This model card claims: XBai o4 excels in complex reasoning capabilities and has now completely surpassed OpenAI-o3-mini in Medium mode. This a 32.8 billion parameter model released by MetaStone…

  • Scott Logic: Automated permissions testing with AWS IAM Policy Simulator

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    Kurt Seifried
    in

    Source URL: https://blog.scottlogic.com/2025/08/01/automated-iam-policy-simulator-testing.html Source: Scott Logic Title: Automated permissions testing with AWS IAM Policy Simulator Feedly Summary: A quick guide to implementing a test framework for IAM permissions using the AWS IAM Policy Simulator API and a tiny hack. AI Summary and Description: Yes Summary: The provided text extensively discusses a workaround for using AWS…

  • Simon Willison’s Weblog: Qwen3-235B-A22B-Thinking-2507

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    by

    Kurt Seifried
    in

    Source URL: https://simonwillison.net/2025/Jul/25/qwen3-235b-a22b-thinking-2507/#atom-everything Source: Simon Willison’s Weblog Title: Qwen3-235B-A22B-Thinking-2507 Feedly Summary: Qwen3-235B-A22B-Thinking-2507 The third Qwen model release week, following Qwen3-235B-A22B-Instruct-2507 on Monday 21st and Qwen3-Coder-480B-A35B-Instruct on Tuesday 22nd. Those two were both non-reasoning models – a change from the previous models in the Qwen 3 family which combined reasoning and non-reasoning in the same model,…