{"id":1466,"date":"2026-09-23T23:58:22","date_gmt":"2026-09-23T23:58:22","guid":{"rendered":"https:\/\/chatx.ai\/blog\/claude-opus-5-5-coute-moins-et-reflechit-toujours\/"},"modified":"2026-09-24T00:44:54","modified_gmt":"2026-09-24T00:44:54","slug":"claude-opus-5-5","status":"publish","type":"post","link":"https:\/\/chatx.ai\/blog\/fr\/claude-opus-5-5\/","title":{"rendered":"Claude Opus 5.5 co\u00fbte moins et r\u00e9fl\u00e9chit toujours"},"content":{"rendered":"<p class=\"intro\">Le 22 septembre, Anthropic a publi\u00e9 Claude Opus 5.5 et retir\u00e9 Opus 5 du m\u00eame coup. Deux choses sautent aux yeux : le mod\u00e8le co\u00fbte un cinqui\u00e8me de moins que son pr\u00e9d\u00e9cesseur et la r\u00e9flexion ne peut plus \u00eatre coup\u00e9e. Sur ChatX, Opus 5.5 est disponible d\u00e8s maintenant.<\/p>\n<nav class=\"toc\">\n<ul>\n<li><a href=\"#changements\">Ce qui change par rapport \u00e0 Opus 5<\/a><\/li>\n<li><a href=\"#reflexion\">La r\u00e9flexion est d\u00e9sormais obligatoire<\/a><\/li>\n<li><a href=\"#cout\">Ce que co\u00fbte une requ\u00eate sur ChatX<\/a><\/li>\n<li><a href=\"#quand\">Quand choisir Opus 5.5 et quand un autre mod\u00e8le<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 id=\"changements\">Ce qui change par rapport \u00e0 Opus 5<\/h2>\n<p>D&#8217;apr\u00e8s <a href=\"https:\/\/platform.claude.com\/docs\/en\/models\/opus-5-5\/overview\" target=\"_blank\" rel=\"noopener\">Anthropic<\/a>, Opus 5.5 co\u00fbte environ vingt pour cent de moins que son pr\u00e9d\u00e9cesseur, \u00e0 l&#8217;entr\u00e9e comme \u00e0 la sortie. La fen\u00eatre de contexte et la limite de sortie ne bougent pas, un million de tokens de contexte et 128 000 tokens de sortie. Le cache est encore plus parlant : une lecture co\u00fbte d\u00e9sormais cinq pour cent du prix d&#8217;entr\u00e9e au lieu de dix. Sur les longues conversations, o\u00f9 ChatX r\u00e9utilise l&#8217;historique, c&#8217;est l\u00e0 que se joue l&#8217;essentiel de l&#8217;\u00e9conomie.<\/p>\n<p>Sur le fond, Anthropic cite trois am\u00e9liorations visibles sans rien faire. \u00c0 niveau \u00e9gal, le mod\u00e8le r\u00e9fl\u00e9chit davantage qu&#8217;Opus 5 et il lit bien plus pr\u00e9cis\u00e9ment les valeurs de graphiques denses, de sch\u00e9mas et de captures d&#8217;\u00e9cran. Il est en outre con\u00e7u pour des t\u00e2ches longues \u00e0 plusieurs \u00e9tapes. Ses connaissances vont jusqu&#8217;\u00e0 juin 2026.<\/p>\n<h2 id=\"reflexion\">La r\u00e9flexion est d\u00e9sormais obligatoire<\/h2>\n<p>Le changement le plus important n&#8217;est pas le prix. Sur Opus 5, on pouvait couper la r\u00e9flexion ; sur Opus 5.5, l&#8217;interface la refuse avec une erreur : la r\u00e9flexion adaptative est toujours active et seule sa profondeur se r\u00e8gle. Anthropic donne \u00ab Moyenne \u00bb comme valeur par d\u00e9faut.<\/p>\n<p>Sur ChatX, cela veut dire qu&#8217;il ne reste que Basse, Moyenne et Haute sous \u00ab Profondeur de la pens\u00e9e \u00bb pour Opus 5.5. Le \u00ab D\u00e9sactiv\u00e9 \u00bb a disparu parce qu&#8217;il n&#8217;existe plus techniquement. Nous d\u00e9marrons sur Basse pour que les questions courtes ne consomment pas de tokens inutilement. Si tu utilisais Opus 5 volontairement sans r\u00e9flexion, Basse est ce qui s&#8217;en rapproche le plus.<\/p>\n<p>Une particularit\u00e9 va avec : les notes br\u00e8ves que le mod\u00e8le \u00e9crit pendant l&#8217;usage d&#8217;outils n&#8217;arrivent plus sous forme de texte normal. Avec la recherche web active, il reste donc silencieux entre les \u00e9tapes de recherche jusqu&#8217;au d\u00e9but de la r\u00e9ponse. Ce n&#8217;est pas un d\u00e9faut, c&#8217;est le nouveau format.<\/p>\n<h2 id=\"cout\">Ce que co\u00fbte une requ\u00eate sur ChatX<\/h2>\n<p>Le tableau convertit une requ\u00eate type de 600 tokens en entr\u00e9e et 400 en r\u00e9ponse en tokens ChatX et place les mod\u00e8les haut de gamme c\u00f4te \u00e0 c\u00f4te.<\/p>\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\">Mod\u00e8le<\/th>\n<th style=\"text-align: left;\" scope=\"col\">Tokens par requ\u00eate<\/th>\n<th style=\"text-align: left;\" scope=\"col\">Rapport<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left;\">Claude Sonnet 5<\/td>\n<td style=\"text-align: left;\">1 156<\/td>\n<td style=\"text-align: left;\">0,5\u00d7<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\">Claude Opus 5.5<\/td>\n<td style=\"text-align: left;\">2 312<\/td>\n<td style=\"text-align: left;\">1\u00d7<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\">GPT-5.6 Sol<\/td>\n<td style=\"text-align: left;\">2 312<\/td>\n<td style=\"text-align: left;\">1\u00d7<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\">Claude Fable 5.1<\/td>\n<td style=\"text-align: left;\">5 778<\/td>\n<td style=\"text-align: left;\">2,5\u00d7<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\">GPT-6 Astra<\/td>\n<td style=\"text-align: left;\">5 778<\/td>\n<td style=\"text-align: left;\">2,5\u00d7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Opus 5.5 se situe donc exactement au niveau de GPT-5.6 Sol et co\u00fbte deux fois et demie moins que Fable 5.1 ou GPT-6 Astra. Un point \u00e0 garder en t\u00eate : plus de r\u00e9flexion signifie plus de tokens de sortie. En \u00ab Haute \u00bb, une r\u00e9ponse peut co\u00fbter plusieurs fois les valeurs du tableau ; en \u00ab Basse \u00bb, elle reste dans cet ordre de grandeur.<\/p>\n<h2 id=\"quand\">Quand choisir Opus 5.5 et quand un autre mod\u00e8le<\/h2>\n<ul>\n<li><strong>Opus 5.5 en Basse :<\/strong> programmer, lire du code, analyses en plusieurs \u00e9tapes, lecture de graphiques et de captures. Le cas standard.<\/li>\n<li><strong>Opus 5.5 en Moyenne ou Haute :<\/strong> bugs retors, t\u00e2ches \u00e0 plusieurs solutions possibles, refontes longues. C&#8217;est seulement l\u00e0 que monter d&#8217;un cran se justifie.<\/li>\n<li><strong>Sonnet 5 :<\/strong> textes du quotidien, r\u00e9sum\u00e9s, traductions. Moiti\u00e9 prix et \u00e0 peine en retrait sur ces t\u00e2ches.<\/li>\n<li><strong>Fable 5.1 :<\/strong> uniquement pour les cas o\u00f9 Opus 5.5 \u00e9choue deux fois. C&#8217;est \u00e0 cela que sert le prix deux fois et demie plus \u00e9lev\u00e9, pas au quotidien.<\/li>\n<li><strong>Images et fichiers :<\/strong> Opus 5.5 comprend les images, tu peux glisser des captures et des graphiques directement dans le chat.<\/li>\n<\/ul>\n<p>Opus 5 est donc remplac\u00e9 sur ChatX et n&#8217;est plus s\u00e9lectionnable. Anthropic garantit Opus 5.5 au moins jusqu&#8217;au 22 septembre 2027. Pour savoir ce qui se cache techniquement derri\u00e8re ce basculement, la liste des changements figure dans les <a href=\"https:\/\/platform.claude.com\/docs\/en\/models\/opus-5-5\/whats-new-opus-5-5\" target=\"_blank\" rel=\"noopener\">notes de version<\/a> et dans le <a href=\"https:\/\/platform.claude.com\/docs\/en\/models\/opus-5-5\/migration-guide\" target=\"_blank\" rel=\"noopener\">guide de migration<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le 22 septembre, Anthropic a publi\u00e9 Claude Opus 5.5 et retir\u00e9 Opus 5 du m\u00eame coup. Deux choses sautent aux yeux : le mod\u00e8le co\u00fbte un cinqui\u00e8me de moins que son pr\u00e9d\u00e9cesseur et la r\u00e9flexion ne peut plus \u00eatre coup\u00e9e. Sur ChatX, Opus 5.5 est disponible d\u00e8s maintenant. Ce qui change par rapport \u00e0 Opus [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1379,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[641],"tags":[],"class_list":["post-1466","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 5.5 co\u00fbte moins et r\u00e9fl\u00e9chit toujours - ChatX Blog<\/title>\n<meta name=\"description\" content=\"Opus 5.5 remplace Opus 5 : vingt pour cent moins cher, r\u00e9flexion impossible \u00e0 couper. 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