Yiannis pontificates on AI and Data
Yiannis AntoniouAI and Data musings from a hands-on practitioner
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 74 | Founded | 2 years ago | Last Issue | 5 days ago |
| Active | |||||
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yiannisantoniou.substack.comLatest Issues
Claude Fable 5 is out on parole
Three weeks ago I wrote what amounted to an obituary for Claude Fable 5, complete with the deceased writing its own eulogy, and I closed by hoping that sanity would prevail and access would be restored sooner rather than later. On June 30 t...
Claude Fable & Mythos, we hardly knew ye
Two days ago I published a piece arguing that Claude Fable 5 was Anthropic’s best model and its own worst enemy, and I closed it by suggesting that the whole launch had the shape of hubris. I did not expect the gods to take the cue quite th...
Claude Fable 5 is Anthropic's best model and its own worst enemy
Note: Substack went down briefly on June 10, and on restore brought back an early draft of this article. I have restored it from my archive, but bad job Substack. Also took the opportunity to add two new screenshots to demonstrate model r...
Anthropic Opus 4.8 is an improvement, but I am still sticking with OpenAI GPT-5.5 (for now)
Anthropic released Claude Opus 4.8 on May 28, 2026, five weeks after OpenAI put GPT-5.5 into the market, and I have been testing it less as a standalone Claude release than as the latest move in a very compressed model race. The improvement...
Battle of the PowerPoint add-ins
When I wrote about GPT-5.2’s PowerPoint generation capabilities back in December, I called them “the real star of the show” and said my PowerPoint workflow might have changed for good. I meant it. The model could take a genuine work assignm...
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I am a NYC-based technologist that loves to talk about AI and Data. www.lydatum.com
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