feat(ai): add adaptive thinking support for Claude Opus 4.6

- Add adaptive thinking mode (type: 'adaptive') for Opus 4.6+ - Add effort parameter ('low', 'medium', 'high', 'max') for adaptive thinking - thinkingEnabled now auto-detects: adaptive for 4.6+, budget-based for older - streamSimple/completeSimple map ThinkingLevel to effort levels for Opus 4.6 - Add tests for Opus 4.6 adaptive thinking and GPT-5.3 Codex - Update @anthropic-ai/sdk to 0.73.0 - Update @aws-sdk/client-bedrock-runtime to 3.983.0 - Update @google/genai to 1.40.0 - Remove fast-xml-parser override (no longer needed)
2026-04-15 09:01:14 +00:00 · 2026-02-05 21:14:11 +01:00 · 2026-02-05 21:14:11 +01:00 · 4c4d787b1a
commit 4c4d787b1a
parent b07b72ba2b
6 changed files with 260 additions and 18 deletions
--- a/package-lock.json
+++ b/package-lock.json
@ -63,9 +63,9 @@
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+			"version": "0.73.0",
+			"resolved": "https://registry.npmjs.org/@anthropic-ai/sdk/-/sdk-0.73.0.tgz",
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@ -1536,19 +1536,20 @@
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 			"license": "Apache-2.0",
 			"dependencies": {
 				"google-auth-library": "^10.3.0",
+				"protobufjs": "^7.5.4",
 				"ws": "^8.18.0"
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 			"engines": {
 				"node": ">=20.0.0"
 			},
 			"peerDependencies": {
-				"@modelcontextprotocol/sdk": "^1.24.0"
+				"@modelcontextprotocol/sdk": "^1.25.2"
 			},
 			"peerDependenciesMeta": {
 				"@modelcontextprotocol/sdk": {
@ -2602,6 +2603,70 @@
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@ -6411,6 +6476,12 @@
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 			"license": "MIT"
 		},
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+			"license": "Apache-2.0"
+		},
 		"node_modules/loupe": {
 			"version": "3.2.1",
 			"resolved": "https://registry.npmjs.org/loupe/-/loupe-3.2.1.tgz",
@ -7059,6 +7130,30 @@
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+				"long": "^5.0.0"
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@ -8470,9 +8565,9 @@
 			"version": "0.52.0",
 			"license": "MIT",
 			"dependencies": {
-				"@anthropic-ai/sdk": "0.71.2",
-				"@aws-sdk/client-bedrock-runtime": "^3.966.0",
-				"@google/genai": "1.34.0",
+				"@anthropic-ai/sdk": "^0.73.0",
+				"@aws-sdk/client-bedrock-runtime": "^3.983.0",
+				"@google/genai": "^1.40.0",
 				"@mistralai/mistralai": "1.10.0",
 				"@sinclair/typebox": "^0.34.41",
 				"ajv": "^8.17.1",
--- a/package.json
+++ b/package.json
@ -48,7 +48,6 @@
 		"get-east-asian-width": "^1.4.0"
 	},
 	"overrides": {
-		"fast-xml-parser": "5.3.4",
 		"rimraf": "6.1.2",
 		"gaxios": {
 			"rimraf": "6.1.2"
--- a/packages/ai/CHANGELOG.md
+++ b/packages/ai/CHANGELOG.md
@ -2,6 +2,20 @@

 ## [Unreleased]

+### Added
+
+- Added adaptive thinking support for Claude Opus 4.6 with effort levels (`low`, `medium`, `high`, `max`)
+- Added `effort` option to `AnthropicOptions` for controlling adaptive thinking depth
+- `thinkingEnabled` now automatically uses adaptive thinking for Opus 4.6+ models and budget-based thinking for older models
+- `streamSimple`/`completeSimple` automatically map `ThinkingLevel` to effort levels for Opus 4.6
+
+### Changed
+
+- Updated `@anthropic-ai/sdk` to 0.73.0
+- Updated `@aws-sdk/client-bedrock-runtime` to 3.983.0
+- Updated `@google/genai` to 1.40.0
+- Removed `fast-xml-parser` override (no longer needed)
+
 ## [0.52.0] - 2026-02-05

 ### Added
--- a/packages/ai/package.json
+++ b/packages/ai/package.json
@ -22,9 +22,9 @@
 		"prepublishOnly": "npm run clean && npm run build"
 	},
 	"dependencies": {
-		"@anthropic-ai/sdk": "0.71.2",
-		"@aws-sdk/client-bedrock-runtime": "^3.966.0",
-		"@google/genai": "1.34.0",
+		"@anthropic-ai/sdk": "^0.73.0",
+		"@aws-sdk/client-bedrock-runtime": "^3.983.0",
+		"@google/genai": "^1.40.0",
 		"@mistralai/mistralai": "1.10.0",
 		"@sinclair/typebox": "^0.34.41",
 		"ajv": "^8.17.1",
--- a/packages/ai/src/providers/anthropic.ts
+++ b/packages/ai/src/providers/anthropic.ts
@ -151,9 +151,30 @@ function convertContentBlocks(content: (TextContent | ImageContent)[]):
 	return blocks;
 }

+export type AnthropicEffort = "low" | "medium" | "high" | "max";
+
 export interface AnthropicOptions extends StreamOptions {
+	/**
+	 * Enable extended thinking.
+	 * For Opus 4.6+: uses adaptive thinking (Claude decides when/how much to think).
+	 * For older models: uses budget-based thinking with thinkingBudgetTokens.
+	 */
 	thinkingEnabled?: boolean;
+	/**
+	 * Token budget for extended thinking (older models only).
+	 * Ignored for Opus 4.6+ which uses adaptive thinking.
+	 */
 	thinkingBudgetTokens?: number;
+	/**
+	 * Effort level for adaptive thinking (Opus 4.6+ only).
+	 * Controls how much thinking Claude allocates:
+	 * - "max": Always thinks with no constraints
+	 * - "high": Always thinks, deep reasoning (default)
+	 * - "medium": Moderate thinking, may skip for simple queries
+	 * - "low": Minimal thinking, skips for simple tasks
+	 * Ignored for older models.
+	 */
+	effort?: AnthropicEffort;
 	interleavedThinking?: boolean;
 	toolChoice?: "auto" | "any" | "none" | { type: "tool"; name: string };
 }
@ -377,6 +398,34 @@ export const streamAnthropic: StreamFunction<"anthropic-messages", AnthropicOpti
 	return stream;
 };

+/**
+ * Check if a model supports adaptive thinking (Opus 4.6+)
+ */
+function supportsAdaptiveThinking(modelId: string): boolean {
+	// Opus 4.6 model IDs (with or without date suffix)
+	return modelId.includes("opus-4-6") || modelId.includes("opus-4.6");
+}
+
+/**
+ * Map ThinkingLevel to Anthropic effort levels for adaptive thinking
+ */
+function mapThinkingLevelToEffort(level: SimpleStreamOptions["reasoning"]): AnthropicEffort {
+	switch (level) {
+		case "minimal":
+			return "low";
+		case "low":
+			return "low";
+		case "medium":
+			return "medium";
+		case "high":
+			return "high";
+		case "xhigh":
+			return "max";
+		default:
+			return "high";
+	}
+}
+
 export const streamSimpleAnthropic: StreamFunction<"anthropic-messages", SimpleStreamOptions> = (
 	model: Model<"anthropic-messages">,
 	context: Context,
@ -392,6 +441,17 @@ export const streamSimpleAnthropic: StreamFunction<"anthropic-messages", SimpleS
 		return streamAnthropic(model, context, { ...base, thinkingEnabled: false } satisfies AnthropicOptions);
 	}

+	// For Opus 4.6+: use adaptive thinking with effort level
+	// For older models: use budget-based thinking
+	if (supportsAdaptiveThinking(model.id)) {
+		const effort = mapThinkingLevelToEffort(options.reasoning);
+		return streamAnthropic(model, context, {
+			...base,
+			thinkingEnabled: true,
+			effort,
+		} satisfies AnthropicOptions);
+	}
+
 	const adjusted = adjustMaxTokensForThinking(
 		base.maxTokens || 0,
 		model.maxTokens,
@ -517,11 +577,21 @@ function buildParams(
 		params.tools = convertTools(context.tools, isOAuthToken);
 	}

+	// Configure thinking mode: adaptive (Opus 4.6+) or budget-based (older models)
 	if (options?.thinkingEnabled && model.reasoning) {
-		params.thinking = {
-			type: "enabled",
-			budget_tokens: options.thinkingBudgetTokens || 1024,
-		};
+		if (supportsAdaptiveThinking(model.id)) {
+			// Adaptive thinking: Claude decides when and how much to think
+			params.thinking = { type: "adaptive" };
+			if (options.effort) {
+				params.output_config = { effort: options.effort };
+			}
+		} else {
+			// Budget-based thinking for older models
+			params.thinking = {
+				type: "enabled",
+				budget_tokens: options.thinkingBudgetTokens || 1024,
+			};
+		}
 	}

 	if (options?.toolChoice) {
--- a/packages/ai/test/stream.test.ts
+++ b/packages/ai/test/stream.test.ts
@ -922,6 +922,42 @@ describe("Generate E2E Tests", () => {
 		});
 	});

+	describe("Anthropic OAuth Provider (claude-opus-4-6 with adaptive thinking)", () => {
+		const model = getModel("anthropic", "claude-opus-4-6");
+
+		it.skipIf(!anthropicOAuthToken)("should complete basic text generation", { retry: 3 }, async () => {
+			await basicTextGeneration(model, { apiKey: anthropicOAuthToken });
+		});
+
+		it.skipIf(!anthropicOAuthToken)("should handle tool calling", { retry: 3 }, async () => {
+			await handleToolCall(model, { apiKey: anthropicOAuthToken });
+		});
+
+		it.skipIf(!anthropicOAuthToken)("should handle streaming", { retry: 3 }, async () => {
+			await handleStreaming(model, { apiKey: anthropicOAuthToken });
+		});
+
+		it.skipIf(!anthropicOAuthToken)("should handle adaptive thinking with effort high", { retry: 3 }, async () => {
+			await handleThinking(model, { apiKey: anthropicOAuthToken, thinkingEnabled: true, effort: "high" });
+		});
+
+		it.skipIf(!anthropicOAuthToken)("should handle adaptive thinking with effort medium", { retry: 3 }, async () => {
+			await handleThinking(model, { apiKey: anthropicOAuthToken, thinkingEnabled: true, effort: "medium" });
+		});
+
+		it.skipIf(!anthropicOAuthToken)(
+			"should handle multi-turn with adaptive thinking and tools",
+			{ retry: 3 },
+			async () => {
+				await multiTurn(model, { apiKey: anthropicOAuthToken, thinkingEnabled: true, effort: "high" });
+			},
+		);
+
+		it.skipIf(!anthropicOAuthToken)("should handle image input", { retry: 3 }, async () => {
+			await handleImage(model, { apiKey: anthropicOAuthToken });
+		});
+	});
+
 	describe("GitHub Copilot Provider (gpt-4o via OpenAI Completions)", () => {
 		const llm = getModel("github-copilot", "gpt-4o");

@ -1098,6 +1134,34 @@ describe("Generate E2E Tests", () => {
 		});
 	});

+	describe("OpenAI Codex Provider (gpt-5.3-codex)", () => {
+		const llm = getModel("openai-codex", "gpt-5.3-codex");
+
+		it.skipIf(!openaiCodexToken)("should complete basic text generation", { retry: 3 }, async () => {
+			await basicTextGeneration(llm, { apiKey: openaiCodexToken });
+		});
+
+		it.skipIf(!openaiCodexToken)("should handle tool calling", { retry: 3 }, async () => {
+			await handleToolCall(llm, { apiKey: openaiCodexToken });
+		});
+
+		it.skipIf(!openaiCodexToken)("should handle streaming", { retry: 3 }, async () => {
+			await handleStreaming(llm, { apiKey: openaiCodexToken });
+		});
+
+		it.skipIf(!openaiCodexToken)("should handle thinking with reasoningEffort high", { retry: 3 }, async () => {
+			await handleThinking(llm, { apiKey: openaiCodexToken, reasoningEffort: "high" });
+		});
+
+		it.skipIf(!openaiCodexToken)("should handle multi-turn with thinking and tools", { retry: 3 }, async () => {
+			await multiTurn(llm, { apiKey: openaiCodexToken, reasoningEffort: "high" });
+		});
+
+		it.skipIf(!openaiCodexToken)("should handle image input", { retry: 3 }, async () => {
+			await handleImage(llm, { apiKey: openaiCodexToken });
+		});
+	});
+
 	describe.skipIf(!hasBedrockCredentials())("Amazon Bedrock Provider (claude-sonnet-4-5)", () => {
 		const llm = getModel("amazon-bedrock", "global.anthropic.claude-sonnet-4-5-20250929-v1:0");