diff --git a/changelog.d/fixes/12379-groq-compound-allam-no-reasoning.md b/changelog.d/fixes/12379-groq-compound-allam-no-reasoning.md
new file mode 100644
index 0000000000..d9db32cc6b
--- /dev/null
+++ b/changelog.d/fixes/12379-groq-compound-allam-no-reasoning.md
@@ -0,0 +1 @@
+- **fix(providers):** declare `groq/compound` and `allam-2-7b` as non-reasoning models in the curated Groq registry so `reasoning_effort` / `output_config.effort` / `thinking` from Claude Code are stripped instead of forwarded, which Groq rejected with HTTP 400 ([#12134](https://github.com/diegosouzapw/OmniRoute/issues/12134))
diff --git a/open-sse/config/providers/registry/groq/index.ts b/open-sse/config/providers/registry/groq/index.ts
index 07fa17d666..974e24e710 100644
--- a/open-sse/config/providers/registry/groq/index.ts
+++ b/open-sse/config/providers/registry/groq/index.ts
@@ -16,6 +16,10 @@ export const groqProvider: RegistryEntry = {
       supportsReasoning: false,
     },
     { id: "llama-3.3-70b-versatile", name: "Llama 3.3 70B", supportsReasoning: false },
+    // Same class (#12134): compound and ALLaM are not reasoning models on Groq either, so
+    // declare it here — undeclared models default to reasoning-capable via the heuristic.
+    { id: "groq/compound", name: "Groq Compound", supportsReasoning: false },
+    { id: "allam-2-7b", name: "ALLaM 2 7B", supportsReasoning: false },
     { id: "openai/gpt-oss-120b", name: "GPT-OSS 120B" },
     { id: "openai/gpt-oss-20b", name: "GPT-OSS 20B" },
     { id: "qwen/qwen3-32b", name: "Qwen3 32B" },
diff --git a/tests/unit/thinking-budget-groq-12134.test.ts b/tests/unit/thinking-budget-groq-12134.test.ts
new file mode 100644
index 0000000000..c9b6aec646
--- /dev/null
+++ b/tests/unit/thinking-budget-groq-12134.test.ts
@@ -0,0 +1,61 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+
+const { applyThinkingBudget, setThinkingBudgetConfig, ThinkingMode, DEFAULT_THINKING_CONFIG } =
+  await import("../../open-sse/services/thinkingBudget.ts");
+
+// Regression coverage for #12134 (same class as #3258): Claude Code → Groq failed with
+// `reasoning_effort` HTTP 400 for `groq/compound` and `allam-2-7b`. Neither model was in the
+// curated Groq registry, so the capability heuristic defaulted them to reasoning-capable and
+// `reasoning_effort` (derived from Claude Code's `output_config.effort`) was forwarded verbatim.
+// Both must now be declared `supportsReasoning: false` so the field is stripped, while reasoning
+// models (gpt-oss) keep it.
+
+test("#12134 groq/groq/compound strips reasoning_effort", () => {
+  setThinkingBudgetConfig({ mode: ThinkingMode.PASSTHROUGH });
+  const out = applyThinkingBudget({
+    model: "groq/groq/compound",
+    messages: [{ role: "user", content: "hi" }],
+    reasoning_effort: "medium",
+  }) as Record<string, unknown>;
+  assert.equal(out.reasoning_effort, undefined, "reasoning_effort must be stripped for compound");
+  setThinkingBudgetConfig(DEFAULT_THINKING_CONFIG);
+});
+
+test("#12134 groq/groq/compound strips output_config.effort and thinking", () => {
+  setThinkingBudgetConfig({ mode: ThinkingMode.PASSTHROUGH });
+  const out = applyThinkingBudget({
+    model: "groq/groq/compound",
+    messages: [{ role: "user", content: "hi" }],
+    output_config: { effort: "high" },
+    thinking: { type: "enabled", budget_tokens: 10240 },
+  }) as Record<string, { effort?: unknown } | undefined>;
+  assert.equal(out.thinking, undefined, "thinking must be stripped");
+  assert.ok(
+    !out.output_config || out.output_config.effort === undefined,
+    "output_config.effort must be stripped (else claude→openai re-injects reasoning_effort)"
+  );
+  setThinkingBudgetConfig(DEFAULT_THINKING_CONFIG);
+});
+
+test("#12134 groq/allam-2-7b strips reasoning_effort", () => {
+  setThinkingBudgetConfig({ mode: ThinkingMode.PASSTHROUGH });
+  const out = applyThinkingBudget({
+    model: "groq/allam-2-7b",
+    messages: [{ role: "user", content: "hi" }],
+    reasoning_effort: "low",
+  }) as Record<string, unknown>;
+  assert.equal(out.reasoning_effort, undefined, "reasoning_effort must be stripped for allam");
+  setThinkingBudgetConfig(DEFAULT_THINKING_CONFIG);
+});
+
+test("#12134 groq/openai/gpt-oss-20b KEEPS reasoning_effort (reasoning model — no regression)", () => {
+  setThinkingBudgetConfig({ mode: ThinkingMode.PASSTHROUGH });
+  const out = applyThinkingBudget({
+    model: "groq/openai/gpt-oss-20b",
+    messages: [{ role: "user", content: "hi" }],
+    reasoning_effort: "high",
+  }) as Record<string, unknown>;
+  assert.equal(out.reasoning_effort, "high", "gpt-oss is a reasoning model — must keep the field");
+  setThinkingBudgetConfig(DEFAULT_THINKING_CONFIG);
+});