{"id":1429,"date":"2026-09-16T15:21:00","date_gmt":"2026-09-16T13:21:00","guid":{"rendered":"https:\/\/chatx.ai\/blog\/claude-opus-5-et-fable-5-1-compares\/"},"modified":"2026-09-24T00:32:35","modified_gmt":"2026-09-24T00:32:35","slug":"claude-opus-5-fable-5-1","status":"publish","type":"post","link":"https:\/\/chatx.ai\/blog\/fr\/claude-opus-5-fable-5-1\/","title":{"rendered":"Claude Opus 5 et Fable 5.1 compar\u00e9s"},"content":{"rendered":"<p class=\"intro\">Anthropic a renouvel\u00e9 deux mod\u00e8les en quelques semaines. Claude Opus 5 a remplac\u00e9 Opus 4.8 au m\u00eame prix et Claude Fable 5.1 reste le mod\u00e8le haut de gamme, tout en devenant plus \u00e9conome \u00e0 l&#8217;usage. Sur ChatX, Fable co\u00fbte d\u00e9sormais environ deux fois et demie le prix d&#8217;Opus. Cet article remet les chiffres en ordre et r\u00e9sume les retours des utilisateurs apr\u00e8s les premi\u00e8res semaines. \u00c0 la fin, tu sauras quand chaque mod\u00e8le vaut le coup.<\/p>\n<nav class=\"toc\">\n<ul>\n<li><a href=\"#opus5\">Opus 5, plus performant au m\u00eame prix<\/a><\/li>\n<li><a href=\"#fable51\">Fable 5.1 co\u00fbte plus cher, mais sert rarement<\/a><\/li>\n<li><a href=\"#retours\">Ce que disent les utilisateurs apr\u00e8s les premi\u00e8res semaines<\/a><\/li>\n<li><a href=\"#reglage\">Bien r\u00e9gler la profondeur de la pens\u00e9e<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 id=\"opus5\">Opus 5, plus performant au m\u00eame prix<\/h2>\n<p><a href=\"https:\/\/www.anthropic.com\/news\/claude-opus-5\" target=\"_blank\" rel=\"noopener\">Claude Opus 5<\/a> co\u00fbte le m\u00eame prix qu&#8217;Opus 4.8 et le d\u00e9passe nettement dans les tests d&#8217;Anthropic. Sur Frontier-Bench, un test de programmation exigeante, Opus 5 double le r\u00e9sultat de son pr\u00e9d\u00e9cesseur pour un co\u00fbt plus faible par t\u00e2che r\u00e9solue. Sur ARC-AGI 3, un test de r\u00e9solution abstraite, il atteint le triple du deuxi\u00e8me meilleur mod\u00e8le. Dans les tests \u00e0 nombreuses \u00e9tapes interm\u00e9diaires, il bat aussi l&#8217;ancien Fable 5 avec environ un tiers de l&#8217;effort.<\/p>\n<p>Au quotidien, cela veut dire :<\/p>\n<ul>\n<li><strong>Chasse aux bugs dans du gros code :<\/strong> Opus 5 v\u00e9rifie et reprend ses propres \u00e9tapes au lieu de deviner apr\u00e8s le premier \u00e9chec. Des t\u00e2ches sur lesquelles Opus 4.8 abandonnait vont maintenant au bout.<\/li>\n<li><strong>Analyses longues :<\/strong> sur de nombreux tours, le mod\u00e8le garde le cap et ne perd pas de vue la question de d\u00e9part.<\/li>\n<li><strong>Rapport qualit\u00e9-prix :<\/strong> pour la plupart des t\u00e2ches exigeantes, Opus est sur ChatX le mod\u00e8le au meilleur rapport entre r\u00e9sultat et tokens, devant Sol et devant Fable.<\/li>\n<\/ul>\n<h2 id=\"fable51\">Fable 5.1 co\u00fbte plus cher, mais sert rarement<\/h2>\n<p><a href=\"https:\/\/www.anthropic.com\/claude-fable-and-mythos-5-1\" target=\"_blank\" rel=\"noopener\">Claude Fable 5.1<\/a> est sorti trois mois apr\u00e8s Fable 5. Le prix de base reste identique, mais relire une entr\u00e9e d\u00e9j\u00e0 trait\u00e9e co\u00fbte 75 pour cent de moins. Sur les longues conversations, o\u00f9 le m\u00eame contexte est relu en permanence, cela r\u00e9duit sensiblement la facture.<\/p>\n<p>Les performances montent aussi. Sur Terminal-Bench-Science, un test de t\u00e2ches scientifiques \u00e0 nombreuses \u00e9tapes, le r\u00e9sultat double, de 24,7 \u00e0 52,6 pour cent. Sur le test de programmation Terminal-Bench 4.0, il passe de 42,0 \u00e0 55,8 pour cent. Anthropic cite l&#8217;exemple d&#8217;un plantage rare dont ni les d\u00e9veloppeurs ni d&#8217;autres mod\u00e8les n&#8217;avaient trouv\u00e9 la cause en plusieurs ann\u00e9es. Fable 5.1 l&#8217;a trouv\u00e9e. La variante Mythos 5.1, aux garde-fous assouplis, n&#8217;est accessible qu&#8217;\u00e0 des organisations am\u00e9ricaines v\u00e9rifi\u00e9es.<\/p>\n<p>Sur ChatX, Fable 5.1 est disponible pour les utilisateurs inscrits et fait d\u00e9sormais partie de l&#8217;abonnement. Contrairement \u00e0 Opus, il fonctionne sans recherche web.<\/p>\n<h2 id=\"retours\">Ce que disent les utilisateurs apr\u00e8s les premi\u00e8res semaines<\/h2>\n<p>Les retours sur Opus 5 sont partag\u00e9s, m\u00eame si les testeurs le classent presque unanimement parmi les meilleurs mod\u00e8les disponibles. On salue sa force sur des t\u00e2ches bien d\u00e9limit\u00e9es. On critique le ton, long, prudent et parfois trop enclin \u00e0 poser des questions, ainsi que l&#8217;attente plus longue avant la premi\u00e8re r\u00e9ponse en profondeur \u00e9lev\u00e9e. Certains d\u00e9veloppeurs trouvent Opus 5 moins agr\u00e9able qu&#8217;Opus 4.8 dans l&#8217;\u00e9change, m\u00eame quand les r\u00e9sultats sont meilleurs.<\/p>\n<p>Cela rejoint ce que nous observons sur ChatX. Sur des questions courtes en profondeur \u00e9lev\u00e9e, la premi\u00e8re r\u00e9ponse met plusieurs secondes sans \u00eatre meilleure pour autant. Sur des t\u00e2ches de travail bien cadr\u00e9es, l&#8217;\u00e9cart avec Opus 4.8 saute aux yeux.<\/p>\n<h2 id=\"reglage\">Bien r\u00e9gler la profondeur de la pens\u00e9e<\/h2>\n<p>Sur ChatX, le r\u00e9glage s&#8217;appelle \u00ab Profondeur de la pens\u00e9e \u00bb avec les niveaux D\u00e9sactiv\u00e9, Basse, Moyenne et Haute. <strong>Mise \u00e0 jour du 24 septembre 2026 :<\/strong> Opus 5 a depuis \u00e9t\u00e9 remplac\u00e9 par <a href=\"https:\/\/chatx.ai\/blog\/fr\/claude-opus-5-5\/\">Claude Opus 5.5<\/a>. Sur ce mod\u00e8le, la r\u00e9flexion ne peut plus \u00eatre coup\u00e9e du tout. Restent Basse, Moyenne et Haute, avec Basse comme point de d\u00e9part. Fable 5.1 n&#8217;a pas non plus de \u00ab D\u00e9sactiv\u00e9 \u00bb.<\/p>\n<ul>\n<li><strong>Conversation, textes, questions :<\/strong> prends le niveau le plus bas disponible. Plus rapide et moins cher. Le ton devient plus direct.<\/li>\n<li><strong>Code et analyses :<\/strong> Opus en \u00ab Basse \u00bb ou \u00ab Moyenne \u00bb. \u00ab Haute \u00bb seulement si la t\u00e2che admet plusieurs solutions.<\/li>\n<li><strong>Quand Opus bloque :<\/strong> refais la m\u00eame t\u00e2che avec Fable 5.1 en \u00ab Moyenne \u00bb. C&#8217;est le cas o\u00f9 le prix nettement plus \u00e9lev\u00e9 se justifie. Comme mod\u00e8le par d\u00e9faut, Fable est surdimensionn\u00e9.<\/li>\n<li><strong>Textes du quotidien :<\/strong> Haiku 4.5 et Sonnet 5 restent le choix le plus rapide et le moins cher.<\/li>\n<\/ul>\n<p>Les tests donnent la direction. Pour savoir si l&#8217;\u00e9cart compte dans ton cas, un essai sur une vraie t\u00e2che est plus parlant que n&#8217;importe quel tableau.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Anthropic a renouvel\u00e9 deux mod\u00e8les en quelques semaines. Claude Opus 5 a remplac\u00e9 Opus 4.8 au m\u00eame prix et Claude Fable 5.1 reste le mod\u00e8le haut de gamme, tout en devenant plus \u00e9conome \u00e0 l&#8217;usage. Sur ChatX, Fable co\u00fbte d\u00e9sormais environ deux fois et demie le prix d&#8217;Opus. Cet article remet les chiffres en ordre [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1332,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[641],"tags":[],"class_list":["post-1429","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-claude"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Claude Opus 5 et Fable 5.1 compar\u00e9s - ChatX Blog<\/title>\n<meta name=\"description\" content=\"Opus 5 offre plus au m\u00eame prix, Fable 5.1 co\u00fbte deux fois et demie plus. 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