Just got this – it's like Christmas, Birthday & birth of your first child happening same week @OpenAIDevs @edwinarbus
@petergostev
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o3 Outperforms Google in Search Rankings: Hard Evidence
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I am so glad there's finally hard evidence to prove what was obvious to anyone using o3 – it's far better at search than anything else out there. Now we have @lmarena_ai search-specific rankings clearly showing o3 beating even dedicated search providers like Google or
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OpenAI OS Models: Fine-tuning and Weight Download Capabilities
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Are you guys thinking of doing anything with the OS models on the OpenAI Platform? e.g. fine tuning and downloading the weights?
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Stealth AI Model Adoption in Cursor Defaults Still Limited
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It is probably a bit early to judge since a lot of people are testing it and it is free, so the effect would be somewhat temporary I'd guess. But equality, nobody is switching Cursor defaults to it, while it is a stealth model
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GPT-5 Parameters Revealed: 3-5T According Samsung Executives
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Who remembers this from September 2024? GPT-5: either 3-5T parameters or 3.5T, according to Samsung execs
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Testing Multiple AI Models: Horizon vs GPT-5 Comparison
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Same, I'm confused by all the models they've been testing. They feel quite different from one another. Horizon better not be GPT-5, the anonymous chatbot they were testing 3 weeks ago was the real deal
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OpenAI’s Open-Source Models Beat Commercial Pricing Benchmarks
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As benchmarks for OpenAI's new open-source models roll in, one thing to keep in mind is how cheap they actually are: – GPT OSS 20b is cheaper than Gemini 2.5 Flash Light or GPT-4.1-Nano.
– GPT OSS 120b is cheaper than recent open-source models from China (e.g., Kimi K2 or GLM -
Opus 4.1 vs Opus 4.0 Performance Comparison Test Results
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Quick test of Opus 4.1 vs Opus 4.0 and other models. Using prompt from @FeatureCrewPod as well as a new prompt for Colosseum simulation.
— Peter Gostev (@petergostev) 5 août 2025
My sense is that Opus 4.0 was kind of busted for these tests – too many errors and quality was ok. 4.1 is not at around Sonnet level, so… pic.twitter.com/fYb5kD9ExEQuick test of Opus 4.1 vs Opus 4.0 and other models. Using prompt from @FeatureCrewPod as well as a new prompt for Colosseum simulation. My sense is that Opus 4.0 was kind of busted for these tests – too many errors and quality was ok. 4.1 is not at around Sonnet level, so
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Improving reasoning performance on AI model endpoints
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I couldn't get the reasoning higher on the endpoints I was testing, so that's another hope for better outputs
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OpenAI Open Source Models 120B and 20B MoE Tested
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A quick test of the @OpenAI new open source models: 120b and 20b MoE models. With the @FeatureCrewPod planet generation prompt
— Peter Gostev (@petergostev) 5 août 2025
The comparison is to the best one I've seen – a yet unreleased OpenAI model, but then Sonnet 4, Kimi K2, Qwen 3 Coder and GLM-4.5 for comparison. The… pic.twitter.com/a4bh1WclKVA quick test of the @OpenAI new open source models: 120b and 20b MoE models. With the @FeatureCrewPod planet generation prompt The comparison is to the best one I've seen – a yet unreleased OpenAI model, but then Sonnet 4, Kimi K2, Qwen 3 Coder and GLM-4.5 for comparison. The