A personal notebook by Guillaume Poussel: measured, unhurried reflections on technology, software architecture, AI, and the road less traveled.https://gpoussel.fr/enhttps://gpoussel.fr/blog/astro-build-12-minutes/https://gpoussel.fr/blog/astro-build-12-minutes/My static Astro blog took 12 minutes to build and deploy. The culprits: satori-html parsing 320 KB data URIs quadratically, AVIF encodings thrown away with every CI runner, and an upload that re-sent unchanged files. Three fixes, a few lines each.Tue, 09 Jun 2026 00:00:00 GMTWebhttps://gpoussel.fr/blog/llm-codingame-optimization/https://gpoussel.fr/blog/llm-codingame-optimization/I pointed Opus 4.8 at six CodinGame optimization puzzles. On the travelling salesman it tied the top of the leaderboard; on the open-ended games it reached a sixth or an eighth of the best score and stopped. The thing it's bad at is the CodinGame squeeze, not the solving.Sun, 07 Jun 2026 00:00:00 GMTAICompetitive Programminghttps://gpoussel.fr/blog/llm-code-golf-typescript/https://gpoussel.fr/blog/llm-code-golf-typescript/I ran Opus 4.8 against 21 CodinGame code golf puzzles in TypeScript, from easy to hard. It never came close to first place, and usually didn't even beat the best human TypeScript. Here are the numbers.Mon, 01 Jun 2026 00:00:00 GMTAICompetitive Programminghttps://gpoussel.fr/blog/anthropic-partner-basecamp/https://gpoussel.fr/blog/anthropic-partner-basecamp/Two days at Anthropic's Partner Basecamp: the diagnostic loop, evals as a discipline, the three phases of AI inside a company, and an evening to rewalk London.Sat, 30 May 2026 00:00:00 GMTAIhttps://gpoussel.fr/blog/a-few-spring-days-around-narbonne/https://gpoussel.fr/blog/a-few-spring-days-around-narbonne/Photos from a late-March trip around Narbonne and the Côte Vermeille: Carcassonne, the canal at Narbonne, a rhino at Sigean, and the wind on the coast at Collioure, all off-season and under the sun.Wed, 15 Apr 2026 00:00:00 GMTTravel