diff --git a/open-sse/providers/capabilities.js b/open-sse/providers/capabilities.js
index bc5a69f3..b8c326c1 100644
--- a/open-sse/providers/capabilities.js
+++ b/open-sse/providers/capabilities.js
@@ -74,6 +74,7 @@ export const MODEL_CAPABILITIES = {
   // Claude 4.6/4.7/4.8 have 1M context + adaptive thinking (override generic claude pattern)
   "claude-opus-4.6":   { vision: true, reasoning: true, search: true, thinkingFormat: "claude-adaptive", contextWindow: 1000000, maxOutput: 128000 },
   "claude-opus-4.7":   { vision: true, reasoning: true, search: true, thinkingFormat: "claude-adaptive", contextWindow: 1000000, maxOutput: 128000 },
+  "claude-opus-4-7":   { vision: true, reasoning: true, search: true, thinkingFormat: "claude-adaptive", contextWindow: 1000000, maxOutput: 128000 },
   "claude-opus-4.8":   { vision: true, reasoning: true, search: true, thinkingFormat: "claude-adaptive", contextWindow: 1000000, maxOutput: 128000 },
   "claude-opus-4-6":   { vision: true, reasoning: true, search: true, thinkingFormat: "claude-adaptive", contextWindow: 1000000, maxOutput: 128000 },
   "claude-opus-4-8":   { vision: true, reasoning: true, search: true, thinkingFormat: "claude-adaptive", contextWindow: 1000000, maxOutput: 128000 },
diff --git a/tests/unit/capabilities-opus-context.test.js b/tests/unit/capabilities-opus-context.test.js
new file mode 100644
index 00000000..9bb7518f
--- /dev/null
+++ b/tests/unit/capabilities-opus-context.test.js
@@ -0,0 +1,34 @@
+import { describe, expect, it } from "vitest";
+
+import { getCapabilitiesForModel } from "../../open-sse/providers/capabilities.js";
+
+// Claude Opus 4.6+ ships a 1M-token context window (GA, standard pricing).
+// The registry exposes dashed ids (claude-opus-4-8, claude-opus-4-7), which
+// must resolve to the 1M context + adaptive thinking caps rather than falling
+// through to the generic *claude*opus* pattern (200k / budget thinking).
+describe("Claude Opus 1M context capabilities", () => {
+  const expected = {
+    contextWindow: 1000000,
+    maxOutput: 128000,
+    thinkingFormat: "claude-adaptive",
+    reasoning: true,
+    vision: true,
+    search: true,
+  };
+
+  for (const model of [
+    "claude-opus-4-8",
+    "claude-opus-4.8",
+    "claude-opus-4-7",
+    "claude-opus-4.7",
+    "claude-opus-4-6",
+  ]) {
+    it(`resolves ${model} to a 1M context window`, () => {
+      expect(getCapabilitiesForModel("cc", model)).toMatchObject(expected);
+    });
+  }
+
+  it("keeps the older Opus 4.5 at the standard 200k context", () => {
+    expect(getCapabilitiesForModel("cc", "claude-opus-4-5-20251101").contextWindow).toBe(200000);
+  });
+});