{"id":1416,"date":"2026-09-13T09:48:00","date_gmt":"2026-09-13T07:48:00","guid":{"rendered":"https:\/\/chatx.ai\/blog\/gemini-3-8-flash-ou-3-5-flash-lite\/"},"modified":"2026-09-24T00:28:40","modified_gmt":"2026-09-24T00:28:40","slug":"gemini-3-8-flash-3-5-flash-lite","status":"publish","type":"post","link":"https:\/\/chatx.ai\/blog\/fr\/gemini-3-8-flash-3-5-flash-lite\/","title":{"rendered":"Gemini 3.8 Flash ou 3.5 Flash Lite"},"content":{"rendered":"<p class=\"intro\">Google fait avancer sa gamme Flash sur deux voies. Gemini 3.8 Flash est le mod\u00e8le de travail pour la programmation et les analyses, Gemini 3.5 Flash Lite le mod\u00e8le rapide pour les t\u00e2ches simples. Les deux sont disponibles sur ChatX, Flash Lite aussi pour les invit\u00e9s. Le tableau montre ce qui les s\u00e9pare. En dessous, tu trouveras lequel choisir et quand.<\/p>\n<nav class=\"toc\">\n<ul>\n<li><a href=\"#tableau\">Gemini 3.8 Flash et 3.5 Flash Lite en un coup d&#8217;\u0153il<\/a><\/li>\n<li><a href=\"#flash38\">Ce qui distingue 3.8 Flash de 3.7 Flash<\/a><\/li>\n<li><a href=\"#lite\">Ce que Flash Lite sait faire et ce qu&#8217;il ne sait pas<\/a><\/li>\n<li><a href=\"#conseil\">Notre recommandation<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 id=\"tableau\">Gemini 3.8 Flash et 3.5 Flash Lite en un coup d&#8217;\u0153il<\/h2>\n<table style=\"width: 100%; border-collapse: collapse; text-align: left;\" border=\"1\" cellpadding=\"10\">\n<thead style=\"background-color: #f0f0f0;\">\n<tr>\n<th style=\"text-align: left;\" scope=\"col\"><\/th>\n<th style=\"text-align: left;\" scope=\"col\">Gemini 3.8 Flash<\/th>\n<th style=\"text-align: left;\" scope=\"col\">Gemini 3.5 Flash Lite<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left;\">Orientation<\/td>\n<td style=\"text-align: left;\">programmation, analyses en plusieurs \u00e9tapes, questions techniques<\/td>\n<td style=\"text-align: left;\">rapidit\u00e9 et d\u00e9bit sur des t\u00e2ches simples<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\">Fen\u00eatre de contexte<\/td>\n<td style=\"text-align: left;\">1 million de tokens<\/td>\n<td style=\"text-align: left;\">1 million de tokens<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\">Profondeur de la pens\u00e9e<\/td>\n<td style=\"text-align: left;\">r\u00e9glable \u00e0 partir de \u00ab Basse \u00bb, impossible \u00e0 couper<\/td>\n<td style=\"text-align: left;\">fixe, non r\u00e9glable<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\">Compr\u00e9hension des images \/ recherche web<\/td>\n<td style=\"text-align: left;\">oui \/ oui<\/td>\n<td style=\"text-align: left;\">oui \/ oui<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\">Prix par token chez le fournisseur<\/td>\n<td style=\"text-align: left;\">\u2248 1,5\u00d7 Flash Lite, \u2248 \u2155 de GPT-5.6 Sol<\/td>\n<td style=\"text-align: left;\">l&#8217;un des mod\u00e8les les moins chers<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\">Accessible \u00e0<\/td>\n<td style=\"text-align: left;\">utilisateurs inscrits<\/td>\n<td style=\"text-align: left;\">invit\u00e9s et utilisateurs inscrits<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"flash38\">Ce qui distingue 3.8 Flash de 3.7 Flash<\/h2>\n<p><a href=\"https:\/\/blog.google\/innovation-and-ai\/models-and-research\/gemini-models\/3-8-flash-and-3-8-flash-cyber\/\" target=\"_blank\" rel=\"noopener\">Google<\/a> d\u00e9crit la diff\u00e9rence ainsi : sur les t\u00e2ches complexes, 3.8 Flash effectue des \u00e9tapes de r\u00e9flexion suppl\u00e9mentaires et rappelle des outils comme la recherche web au lieu de s&#8217;arr\u00eater apr\u00e8s le premier essai. Les tests le confirment. Sur DeepSWE, un test de t\u00e2ches logicielles men\u00e9es seules, 3.8 Flash devance la plupart des grands mod\u00e8les de pointe. Sur HLE-Verified, un test large de connaissances et d&#8217;analyse, il atteint 54,9 pour cent. Sur les t\u00e2ches financi\u00e8res et juridiques (Vals Finance Agent, Harvey Legal Agent), il fait nettement mieux que 3.7 Flash.<\/p>\n<p>Le revers : plus d&#8217;\u00e9tapes de r\u00e9flexion, c&#8217;est plus de tokens par r\u00e9ponse. Si tu veux juste une information br\u00e8ve, tu paies une minutie inutile. La profondeur peut descendre \u00e0 \u00ab Basse \u00bb, mais sur 3.8 Flash elle ne se coupe pas. Un d\u00e9tail de prix s&#8217;ajoute : 3.8 Flash est \u00e0 tarif de lancement jusqu&#8217;\u00e0 fin d\u00e9cembre, apr\u00e8s quoi Google double le prix de ce mod\u00e8le. Flash Lite n&#8217;est pas concern\u00e9.<\/p>\n<h2 id=\"lite\">Ce que Flash Lite sait faire et ce qu&#8217;il ne sait pas<\/h2>\n<p><a href=\"https:\/\/ai.google.dev\/gemini-api\/docs\/models\/gemini-3.5-flash-lite\" target=\"_blank\" rel=\"noopener\">Gemini 3.5 Flash Lite<\/a> est con\u00e7u pour des r\u00e9ponses rapides \u00e0 faible co\u00fbt. Il lit les images et les documents, accepte jusqu&#8217;\u00e0 un million de tokens en entr\u00e9e et r\u00e9pond avec tr\u00e8s peu d&#8217;attente. Sur ChatX, c&#8217;est le mod\u00e8le le plus rapide accessible aux invit\u00e9s sans inscription. Pour des captures d&#8217;\u00e9cran, des traductions, des r\u00e9sum\u00e9s et de courtes explications, il suffit largement.<\/p>\n<p>Sa limite, ce sont les t\u00e2ches qui demandent plusieurs \u00e9tapes de raisonnement : calculs imbriqu\u00e9s, code avec d\u00e9pendances, textes aux sources contradictoires. L\u00e0, il produit des r\u00e9ponses plausibles mais souvent fausses. Non parce qu&#8217;il est mauvais, mais parce qu&#8217;il n&#8217;a pas \u00e9t\u00e9 con\u00e7u pour cela.<\/p>\n<h2 id=\"conseil\">Notre recommandation<\/h2>\n<ul>\n<li><strong>Flash Lite par d\u00e9faut :<\/strong> pour tout ce qui tient en une phrase. Quand on d\u00e9marre en tant qu&#8217;invit\u00e9, c&#8217;est le meilleur rapport entre vitesse et qualit\u00e9.<\/li>\n<li><strong>3.8 Flash sur \u00ab Basse \u00bb :<\/strong> pour la programmation, les analyses longues et les questions techniques. Il fournit, pour une fraction du co\u00fbt de Sol, des r\u00e9sultats qui exigeaient encore r\u00e9cemment un mod\u00e8le haut de gamme.<\/li>\n<li><strong>Ni l&#8217;un ni l&#8217;autre :<\/strong> quand la pr\u00e9cision maximale compte, donc contrats, chiffres qui seront v\u00e9rifi\u00e9s, documents servant \u00e0 d\u00e9cider. Opus 5.5, Sol ou Astra sont alors le meilleur choix, m\u00eame s&#8217;ils co\u00fbtent plus cher.<\/li>\n<\/ul>\n<p>Un test simple pour situer la fronti\u00e8re : si Flash Lite r\u00e9pond deux fois diff\u00e9remment \u00e0 la m\u00eame question, c&#8217;est une t\u00e2che pour 3.8 Flash.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Google fait avancer sa gamme Flash sur deux voies. Gemini 3.8 Flash est le mod\u00e8le de travail pour la programmation et les analyses, Gemini 3.5 Flash Lite le mod\u00e8le rapide pour les t\u00e2ches simples. Les deux sont disponibles sur ChatX, Flash Lite aussi pour les invit\u00e9s. Le tableau montre ce qui les s\u00e9pare. En dessous, [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1329,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[631],"tags":[],"class_list":["post-1416","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gemini"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gemini 3.8 Flash ou 3.5 Flash Lite - ChatX Blog<\/title>\n<meta name=\"description\" content=\"Gemini 3.8 Flash pour le code et l&#039;analyse, Flash Lite pour la vitesse. 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