diff --git a/backend/nitro.config.ts b/backend/nitro.config.ts
index d63903f..1584870 100644
--- a/backend/nitro.config.ts
+++ b/backend/nitro.config.ts
@@ -81,6 +81,9 @@ export default defineNitroConfig({
       "",
     openaiApiKey:
       process.env.OPENAI_API_KEY ?? process.env.NUXT_OPENAI_API_KEY ?? "",
+    // Direkter Anthropic-Pfad (native Messages-API) — primärer Lyra-Provider.
+    anthropicApiKey:
+      process.env.ANTHROPIC_API_KEY ?? process.env.NUXT_ANTHROPIC_API_KEY ?? "",
     groqApiKey: process.env.GROQ_API_KEY ?? process.env.NUXT_GROQ_API_KEY ?? "",
     googleAiApiKey: process.env.GOOGLE_AI_API_KEY ?? "",
     geminiApiKey: process.env.GEMINI_API_KEY ?? "",
diff --git a/backend/server/api/coach/message.post.ts b/backend/server/api/coach/message.post.ts
index eb1fce2..374ae17 100644
--- a/backend/server/api/coach/message.post.ts
+++ b/backend/server/api/coach/message.post.ts
@@ -654,28 +654,69 @@ export default defineEventHandler(async (event) => {
   }
 
   // ─── Tier-basiertes LLM-Routing (analog sos-stream.get.ts) ─────────────────
-  // Default-Chain: Gemini Flash Lite (schnell+billig+warm) → Gemini 2.5 Flash
-  // (smarter Fallback) → OpenAI gpt-4o-mini (Last-Resort, anderer Provider).
-  // OpenRouter + Groq sind aktuell ohne Quota/Credits — entfernt aus Chain.
+  // Default-Chain: Anthropic Haiku 4.5 (direkt, native Messages-API — warmer
+  // Lyra-Ton, günstig+zuverlässig) → Gemini Flash Lite → Gemini 2.5 Flash →
+  // OpenAI gpt-4o-mini (Last-Resort, anderer Provider). OpenRouter + Groq sind
+  // aktuell ohne Quota/Credits — entfernt aus Chain.
   const planRaw = (profile?.plan ?? "free").toLowerCase();
   const plan =
     planRaw === "premium" ? "legend" : planRaw === "standard" ? "pro" : planRaw;
-  const llmProvider = "gemini-flash-lite";
+  const llmProvider = "anthropic-haiku";
 
   type Candidate = {
-    provider: "groq" | "openrouter" | "gemini" | "openai";
+    provider: "anthropic" | "groq" | "openrouter" | "gemini" | "openai";
     model: string;
   };
   const candidates: Candidate[] = [
+    { provider: "anthropic", model: "claude-haiku-4-5" },
     { provider: "gemini", model: "gemini-2.5-flash-lite" },
     { provider: "gemini", model: "gemini-2.5-flash" },
     { provider: "openai", model: "gpt-4o-mini" },
   ];
 
   async function tryModel(
-    providerName: "groq" | "openrouter" | "gemini" | "openai",
+    providerName: "anthropic" | "groq" | "openrouter" | "gemini" | "openai",
     model: string,
   ) {
+    // ── Direkter Anthropic-Pfad: native Messages-API (kein OpenAI-Shape) ──
+    if (providerName === "anthropic") {
+      const key = config.anthropicApiKey as string | undefined;
+      if (!key) return null;
+      // Anthropic verlangt user-first; .slice(-8) kann mit assistant beginnen.
+      const aMsgs =
+        trimmed[0]?.role === "assistant" ? trimmed.slice(1) : trimmed;
+      try {
+        const res = await $fetch<{ content: { type: string; text: string }[] }>(
+          "https://api.anthropic.com/v1/messages",
+          {
+            method: "POST",
+            headers: {
+              "x-api-key": key,
+              "anthropic-version": "2023-06-01",
+              "Content-Type": "application/json",
+            },
+            body: {
+              model,
+              max_tokens: 500,
+              system: systemPrompt,
+              messages: aMsgs,
+            },
+            timeout: 15000,
+          },
+        );
+        return (
+          res.content?.find((b) => b.type === "text")?.text ?? null
+        );
+      } catch (err: any) {
+        console.warn(
+          `[coach/tryModel] anthropic:${model} FAIL:`,
+          err?.statusCode ?? err?.status ?? "?",
+          err?.data?.error?.message ?? err?.message ?? String(err).slice(0, 200),
+        );
+        return null;
+      }
+    }
+
     const p = PROVIDER_CONFIG[providerName];
     const key = config[p.keyName];
     if (!key) return null;
diff --git a/backend/server/api/coach/sos-stream.get.ts b/backend/server/api/coach/sos-stream.get.ts
index 5e39985..98a41df 100644
--- a/backend/server/api/coach/sos-stream.get.ts
+++ b/backend/server/api/coach/sos-stream.get.ts
@@ -231,77 +231,158 @@ export default defineEventHandler(async (event) => {
   // Tier-based LLM: Pro=Groq (sachlich+schnell), Legend=Haiku 4.5 (warm+fast),
   // Free=Groq (kostenkontrolle). User kann via Toggle override (debug);
   // 'auto' (oder undefined) → plan-based default.
+  // Default-Kette: Anthropic Haiku 4.5 (direkt, native Messages-API — warmer
+  // Lyra-Ton, günstig+zuverlässig) → Gemini Flash Lite → OpenAI gpt-4o-mini.
+  // Die ERSTE Kandidatin, die einen OK-Stream liefert, gewinnt — SOS darf im
+  // Krisen-Kontext nie ohne Antwort bleiben (vorher: single fetch ohne Fallback
+  // → bei Provider-Fail sofort Krisen-Text). Debug-Toggle override ohne Fallback.
   const userToggle = sessionData.llmProvider;
-  let llmProvider: string;
-  if (userToggle && userToggle !== "auto") {
-    llmProvider = userToggle;
-  } else {
-    // Default chain: Gemini Flash Lite (schnell+billig+warm) für alle Pläne.
-    // OpenRouter (Haiku/Sonnet) + Groq haben aktuell keine Quota/Credits.
-    llmProvider = "gemini-flash-lite";
-  }
-  let upstreamUrl: string;
-  let upstreamKey: string | undefined;
-  let upstreamModel: string;
-  const upstreamHeaders: Record<string, string> = { "Content-Type": "application/json" };
-  let upstreamProviderField: { sort: string } | undefined;
-  if (llmProvider === "gemini-flash-lite" || llmProvider === "gemini-flash") {
-    upstreamUrl = "https://generativelanguage.googleapis.com/v1beta/openai/chat/completions";
-    upstreamKey = config.geminiApiKey as string | undefined;
-    upstreamModel = llmProvider === "gemini-flash" ? "gemini-2.5-flash" : "gemini-2.5-flash-lite";
-  } else if (llmProvider === "groq-llama") {
-    upstreamUrl = "https://api.groq.com/openai/v1/chat/completions";
-    upstreamKey = config.groqApiKey as string | undefined;
-    upstreamModel = "llama-3.3-70b-versatile";
-  } else {
-    upstreamUrl = "https://openrouter.ai/api/v1/chat/completions";
-    upstreamKey = config.openrouterApiKey as string | undefined;
-    upstreamModel = llmProvider === "openrouter-haiku"
-      ? "anthropic/claude-haiku-4.5"
-      : "anthropic/claude-sonnet-4.5";
-    upstreamHeaders["HTTP-Referer"] = "https://rebreak.org";
-    upstreamHeaders["X-Title"] = "ReBreak SOS";
-    upstreamProviderField = { sort: "latency" };
-  }
-  // Fallback: wenn gewählter Provider keinen Key hat → OpenAI gpt-4o-mini als Anker
-  if (!upstreamKey && config.openaiApiKey) {
-    console.warn(`[coach/sos-stream] ${llmProvider} key missing → fallback openai/gpt-4o-mini`);
-    llmProvider = "openai-mini";
-    upstreamUrl = "https://api.openai.com/v1/chat/completions";
-    upstreamKey = config.openaiApiKey as string;
-    upstreamModel = "gpt-4o-mini";
-    upstreamProviderField = undefined;
-  }
-  if (!upstreamKey) {
-    throw createError({ statusCode: 503, message: `API key for ${llmProvider} fehlt` });
-  }
-  upstreamHeaders.Authorization = `Bearer ${upstreamKey}`;
-  console.log(`[coach/sos-stream] using provider=${llmProvider} model=${upstreamModel}`);
+  type SosCandidate = { provider: string; model: string };
+  const candidates: SosCandidate[] =
+    userToggle && userToggle !== "auto"
+      ? [{ provider: userToggle, model: "" }]
+      : [
+          { provider: "anthropic-haiku", model: "claude-haiku-4-5" },
+          { provider: "gemini-flash-lite", model: "gemini-2.5-flash-lite" },
+          { provider: "openai-mini", model: "gpt-4o-mini" },
+        ];
 
-  const upstream = await fetch(upstreamUrl, {
-    method: "POST",
-    headers: upstreamHeaders,
-    body: JSON.stringify({
-      model: upstreamModel,
-      max_tokens: 400,
-      stream: true,
-      messages: [{ role: "system", content: systemPrompt }, ...trimmed],
-      ...(upstreamProviderField ? { provider: upstreamProviderField } : {}),
-    }),
-  });
+  // Baut die Upstream-Request-Config für einen Provider; null wenn Key fehlt.
+  // Anthropic nutzt die native Messages-API (system top-level, x-api-key);
+  // alle anderen das OpenAI-kompatible /chat/completions-Shape.
+  const buildUpstream = (
+    provider: string,
+  ): { url: string; headers: Record<string, string>; body: string; label: string } | null => {
+    const headers: Record<string, string> = { "Content-Type": "application/json" };
+    if (provider === "anthropic-haiku") {
+      const key = config.anthropicApiKey as string | undefined;
+      if (!key) return null;
+      headers["x-api-key"] = key;
+      headers["anthropic-version"] = "2023-06-01";
+      // Anthropic verlangt user-first; trimmed kann mit assistant beginnen.
+      const aMsgs = trimmed[0]?.role === "assistant" ? trimmed.slice(1) : trimmed;
+      return {
+        url: "https://api.anthropic.com/v1/messages",
+        headers,
+        body: JSON.stringify({
+          model: "claude-haiku-4-5",
+          max_tokens: 400,
+          stream: true,
+          system: systemPrompt,
+          messages: aMsgs,
+        }),
+        label: "anthropic:claude-haiku-4-5",
+      };
+    }
+    if (provider === "gemini-flash-lite" || provider === "gemini-flash") {
+      const key = config.geminiApiKey as string | undefined;
+      if (!key) return null;
+      headers.Authorization = `Bearer ${key}`;
+      const model = provider === "gemini-flash" ? "gemini-2.5-flash" : "gemini-2.5-flash-lite";
+      return {
+        url: "https://generativelanguage.googleapis.com/v1beta/openai/chat/completions",
+        headers,
+        body: JSON.stringify({
+          model,
+          max_tokens: 400,
+          stream: true,
+          messages: [{ role: "system", content: systemPrompt }, ...trimmed],
+        }),
+        label: `gemini:${model}`,
+      };
+    }
+    if (provider === "groq-llama") {
+      const key = config.groqApiKey as string | undefined;
+      if (!key) return null;
+      headers.Authorization = `Bearer ${key}`;
+      return {
+        url: "https://api.groq.com/openai/v1/chat/completions",
+        headers,
+        body: JSON.stringify({
+          model: "llama-3.3-70b-versatile",
+          max_tokens: 400,
+          stream: true,
+          messages: [{ role: "system", content: systemPrompt }, ...trimmed],
+        }),
+        label: "groq:llama-3.3-70b",
+      };
+    }
+    if (provider === "openrouter-haiku" || provider === "openrouter-sonnet") {
+      const key = config.openrouterApiKey as string | undefined;
+      if (!key) return null;
+      headers.Authorization = `Bearer ${key}`;
+      headers["HTTP-Referer"] = "https://rebreak.org";
+      headers["X-Title"] = "ReBreak SOS";
+      const model =
+        provider === "openrouter-haiku"
+          ? "anthropic/claude-haiku-4.5"
+          : "anthropic/claude-sonnet-4.5";
+      return {
+        url: "https://openrouter.ai/api/v1/chat/completions",
+        headers,
+        body: JSON.stringify({
+          model,
+          max_tokens: 400,
+          stream: true,
+          messages: [{ role: "system", content: systemPrompt }, ...trimmed],
+          provider: { sort: "latency" },
+        }),
+        label: `openrouter:${model}`,
+      };
+    }
+    // openai-mini — letzter Anker (anderer Provider).
+    if (provider === "openai-mini") {
+      const key = config.openaiApiKey as string | undefined;
+      if (!key) return null;
+      headers.Authorization = `Bearer ${key}`;
+      return {
+        url: "https://api.openai.com/v1/chat/completions",
+        headers,
+        body: JSON.stringify({
+          model: "gpt-4o-mini",
+          max_tokens: 400,
+          stream: true,
+          messages: [{ role: "system", content: systemPrompt }, ...trimmed],
+        }),
+        label: "openai:gpt-4o-mini",
+      };
+    }
+    return null;
+  };
+
+  // Erste Kandidatin, die einen OK-Stream liefert.
+  let upstream: Response | undefined;
+  let usedLabel = "none";
+  for (const c of candidates) {
+    const cfg = buildUpstream(c.provider);
+    if (!cfg) continue;
+    try {
+      const resp = await fetch(cfg.url, {
+        method: "POST",
+        headers: cfg.headers,
+        body: cfg.body,
+      });
+      if (resp.ok && resp.body) {
+        upstream = resp;
+        usedLabel = cfg.label;
+        break;
+      }
+      const errText = await resp.text().catch(() => "");
+      console.error(
+        `[coach/sos-stream] ${cfg.label} upstream error:`,
+        resp.status,
+        errText.slice(0, 300),
+      );
+    } catch (e) {
+      console.error(`[coach/sos-stream] ${cfg.label} fetch threw:`, e);
+    }
+  }
 
   // ── Upstream-Fehler: SSE-Header trotzdem setzen, dann Fallback senden ──────
   // (b) Timeout/Leer-Fallback: Kein 502-Throw im Krisen-Kontext — User muss
   // immer eine Antwort sehen. Bei LLM-Fehler sofort Krisen-Fallback liefern.
-  const upstreamFailed = !upstream.ok || !upstream.body;
-  if (upstreamFailed) {
-    const errText = await upstream.text().catch(() => "");
-    console.error(
-      "[coach/sos-stream] upstream error:",
-      upstream.status,
-      errText.slice(0, 300),
-    );
-  }
+  const upstreamFailed = !upstream || !upstream.body;
+  console.log(`[coach/sos-stream] using ${usedLabel}`);
 
   // Direkt zu Node res schreiben — sendStream(ReadableStream) pumpt pull() in Nitro nicht zuverlässig
   const res = event.node.res;
@@ -352,7 +433,7 @@ export default defineEventHandler(async (event) => {
     return;
   }
 
-  const reader = upstream.body.getReader();
+  const reader = upstream!.body!.getReader();
   const decoder = new TextDecoder();
   let buffer = "";
   let fullText = "";
@@ -382,8 +463,14 @@ export default defineEventHandler(async (event) => {
         try {
           const json = JSON.parse(payload) as {
             choices?: { delta?: { content?: string } }[];
+            type?: string;
+            delta?: { type?: string; text?: string };
           };
-          const delta = json.choices?.[0]?.delta?.content;
+          // OpenAI-kompatibel: choices[].delta.content
+          // Anthropic nativ: event content_block_delta → delta.text
+          const delta =
+            json.choices?.[0]?.delta?.content ??
+            (json.type === "content_block_delta" ? json.delta?.text : undefined);
           if (delta) {
             fullText += delta;
             chunkCount++;
diff --git a/backend/server/utils/plan-features.ts b/backend/server/utils/plan-features.ts
index c1822fa..dae1268 100644
--- a/backend/server/utils/plan-features.ts
+++ b/backend/server/utils/plan-features.ts
@@ -120,16 +120,12 @@ export const PLAN_LIMITS: Record<Exclude<Plan, "free">, PlanLimits> = {
       { provider: "groq", model: "llama-3.3-70b-versatile" },
     ],
     aiProvider: "openrouter",
-    // ⚠️ TEMPORÄR (2026-06-08): ElevenLabs-Account hat ein Zahlungsproblem
-    // (HTTP 401 payment_issue) → Legend würde sonst 502 bekommen. Übergangsweise
-    // auf Cartesia (sonic-3) umgeleitet, damit Legend-User trotzdem Sprachausgabe
-    // haben. ZURÜCKSETZEN sobald die ElevenLabs-Rechnung bezahlt ist:
-    //   provider: "elevenlabs", model: "eleven_turbo_v2_5", dailyQuotaSeconds: 0
-    // (Hinweis: mit Cartesia greift der Legend-Voice-Picker / lyraVoiceId nicht —
-    //  Legend hört solange Cartesias Default-Stimme wie Pro.)
+    // Legend → ElevenLabs Turbo v2.5, unlimited. Voice-Picker / lyraVoiceId greift.
+    // (2026-06-08 war wg. ElevenLabs-Zahlungsproblem temporär auf Cartesia umgeleitet;
+    //  2026-06-11 neuer Key + bezahlt → zurückgesetzt.)
     voice: {
-      provider: "cartesia",
-      model: "sonic-3",
+      provider: "elevenlabs",
+      model: "eleven_turbo_v2_5",
       dailyQuotaSeconds: 0,       // Legend bleibt unlimited
     },
   },