Update Claude Opus and GPT thinking metadata

packages/ai/CHANGELOG.md

@@ -5,10 +5,12 @@
 ### Added
 
 - Added OpenAI Codex subscription device-code login as a selectable headless alternative while keeping browser login as the default.
+- Added Claude Opus 4.8 model metadata for Anthropic and updated Opus adaptive-thinking coverage to use it.
 
 ### Fixed
 
 - Fixed Anthropic-compatible replay for providers that return empty thinking signatures by adding an opt-in `allowEmptySignature` compatibility flag ([#4464](https://github.com/earendil-works/pi/issues/4464)).
+- Fixed OpenAI and OpenRouter GPT-5.5 Pro thinking level metadata to expose only supported medium, high, and xhigh efforts.
 
 ## [0.76.0] - 2026-05-27
 

packages/ai/scripts/generate-models.ts

@@ -184,6 +184,8 @@ function isAnthropicAdaptiveThinkingModel(modelId: string): boolean {
 		modelId.includes("opus-4.6") ||
 		modelId.includes("opus-4-7") ||
 		modelId.includes("opus-4.7") ||
+		modelId.includes("opus-4-8") ||
+		modelId.includes("opus-4.8") ||
 		modelId.includes("sonnet-4-6") ||
 		modelId.includes("sonnet-4.6")
 	);
@@ -225,10 +227,18 @@ function applyThinkingLevelMetadata(model: Model<any>): void {
 	if (supportsOpenAiXhigh(model.id)) {
 		mergeThinkingLevelMap(model, { xhigh: "xhigh" });
 	}
+	if (model.id.endsWith("gpt-5.5-pro")) {
+		mergeThinkingLevelMap(model, { off: null, minimal: null, low: null });
+	}
 	if (model.id.includes("opus-4-6") || model.id.includes("opus-4.6")) {
 		mergeThinkingLevelMap(model, { xhigh: "max" });
 	}
-	if (model.id.includes("opus-4-7") || model.id.includes("opus-4.7")) {
+	if (
+		model.id.includes("opus-4-7") ||
+		model.id.includes("opus-4.7") ||
+		model.id.includes("opus-4-8") ||
+		model.id.includes("opus-4.8")
+	) {
 		mergeThinkingLevelMap(model, { xhigh: "xhigh" });
 	}
 	if (model.api === "anthropic-messages" && isAnthropicAdaptiveThinkingModel(model.id)) {
@@ -1273,6 +1283,27 @@ async function generateModels() {
 		});
 	}
 
+	// Add missing Claude Opus 4.8
+	if (!allModels.some(m => m.provider === "anthropic" && m.id === "claude-opus-4-8")) {
+		allModels.push({
+			id: "claude-opus-4-8",
+			name: "Claude Opus 4.8",
+			api: "anthropic-messages",
+			baseUrl: "https://api.anthropic.com",
+			provider: "anthropic",
+			reasoning: true,
+			input: ["text", "image"],
+			cost: {
+				input: 5,
+				output: 25,
+				cacheRead: 0.5,
+				cacheWrite: 6.25,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		});
+	}
+
 	// Add missing Claude Sonnet 4.6
 	if (!allModels.some(m => m.provider === "anthropic" && m.id === "claude-sonnet-4-6")) {
 		allModels.push({

packages/ai/src/models.generated.ts

@@ -160,6 +160,24 @@ export const MODELS = {
 			contextWindow: 1000000,
 			maxTokens: 128000,
 		} satisfies Model<"bedrock-converse-stream">,
+		"anthropic.claude-opus-4-8": {
+			id: "anthropic.claude-opus-4-8",
+			name: "Claude Opus 4.8",
+			api: "bedrock-converse-stream",
+			provider: "amazon-bedrock",
+			baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
+			reasoning: true,
+			thinkingLevelMap: {"xhigh":"xhigh"},
+			input: ["text", "image"],
+			cost: {
+				input: 5,
+				output: 25,
+				cacheRead: 0.5,
+				cacheWrite: 6.25,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"bedrock-converse-stream">,
 		"anthropic.claude-sonnet-4-5-20250929-v1:0": {
 			id: "anthropic.claude-sonnet-4-5-20250929-v1:0",
 			name: "Claude Sonnet 4.5",
@@ -229,6 +247,24 @@ export const MODELS = {
 			contextWindow: 1000000,
 			maxTokens: 128000,
 		} satisfies Model<"bedrock-converse-stream">,
+		"au.anthropic.claude-opus-4-8": {
+			id: "au.anthropic.claude-opus-4-8",
+			name: "Claude Opus 4.8 (AU)",
+			api: "bedrock-converse-stream",
+			provider: "amazon-bedrock",
+			baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
+			reasoning: true,
+			thinkingLevelMap: {"xhigh":"xhigh"},
+			input: ["text", "image"],
+			cost: {
+				input: 5,
+				output: 25,
+				cacheRead: 0.5,
+				cacheWrite: 6.25,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"bedrock-converse-stream">,
 		"au.anthropic.claude-sonnet-4-5-20250929-v1:0": {
 			id: "au.anthropic.claude-sonnet-4-5-20250929-v1:0",
 			name: "Claude Sonnet 4.5 (AU)",
@@ -384,6 +420,24 @@ export const MODELS = {
 			contextWindow: 1000000,
 			maxTokens: 128000,
 		} satisfies Model<"bedrock-converse-stream">,
+		"eu.anthropic.claude-opus-4-8": {
+			id: "eu.anthropic.claude-opus-4-8",
+			name: "Claude Opus 4.8 (EU)",
+			api: "bedrock-converse-stream",
+			provider: "amazon-bedrock",
+			baseUrl: "https://bedrock-runtime.eu-central-1.amazonaws.com",
+			reasoning: true,
+			thinkingLevelMap: {"xhigh":"xhigh"},
+			input: ["text", "image"],
+			cost: {
+				input: 5,
+				output: 25,
+				cacheRead: 0.5,
+				cacheWrite: 6.25,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"bedrock-converse-stream">,
 		"eu.anthropic.claude-sonnet-4-5-20250929-v1:0": {
 			id: "eu.anthropic.claude-sonnet-4-5-20250929-v1:0",
 			name: "Claude Sonnet 4.5 (EU)",
@@ -488,6 +542,24 @@ export const MODELS = {
 			contextWindow: 1000000,
 			maxTokens: 128000,
 		} satisfies Model<"bedrock-converse-stream">,
+		"global.anthropic.claude-opus-4-8": {
+			id: "global.anthropic.claude-opus-4-8",
+			name: "Claude Opus 4.8 (Global)",
+			api: "bedrock-converse-stream",
+			provider: "amazon-bedrock",
+			baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
+			reasoning: true,
+			thinkingLevelMap: {"xhigh":"xhigh"},
+			input: ["text", "image"],
+			cost: {
+				input: 5,
+				output: 25,
+				cacheRead: 0.5,
+				cacheWrite: 6.25,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"bedrock-converse-stream">,
 		"global.anthropic.claude-sonnet-4-5-20250929-v1:0": {
 			id: "global.anthropic.claude-sonnet-4-5-20250929-v1:0",
 			name: "Claude Sonnet 4.5 (Global)",
@@ -574,6 +646,24 @@ export const MODELS = {
 			contextWindow: 1000000,
 			maxTokens: 128000,
 		} satisfies Model<"bedrock-converse-stream">,
+		"jp.anthropic.claude-opus-4-8": {
+			id: "jp.anthropic.claude-opus-4-8",
+			name: "Claude Opus 4.8 (JP)",
+			api: "bedrock-converse-stream",
+			provider: "amazon-bedrock",
+			baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
+			reasoning: true,
+			thinkingLevelMap: {"xhigh":"xhigh"},
+			input: ["text", "image"],
+			cost: {
+				input: 5,
+				output: 25,
+				cacheRead: 0.5,
+				cacheWrite: 6.25,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"bedrock-converse-stream">,
 		"jp.anthropic.claude-sonnet-4-5-20250929-v1:0": {
 			id: "jp.anthropic.claude-sonnet-4-5-20250929-v1:0",
 			name: "Claude Sonnet 4.5 (JP)",
@@ -1273,6 +1363,24 @@ export const MODELS = {
 			contextWindow: 1000000,
 			maxTokens: 128000,
 		} satisfies Model<"bedrock-converse-stream">,
+		"us.anthropic.claude-opus-4-8": {
+			id: "us.anthropic.claude-opus-4-8",
+			name: "Claude Opus 4.8 (US)",
+			api: "bedrock-converse-stream",
+			provider: "amazon-bedrock",
+			baseUrl: "https://bedrock-runtime.us-east-1.amazonaws.com",
+			reasoning: true,
+			thinkingLevelMap: {"xhigh":"xhigh"},
+			input: ["text", "image"],
+			cost: {
+				input: 5,
+				output: 25,
+				cacheRead: 0.5,
+				cacheWrite: 6.25,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"bedrock-converse-stream">,
 		"us.anthropic.claude-sonnet-4-5-20250929-v1:0": {
 			id: "us.anthropic.claude-sonnet-4-5-20250929-v1:0",
 			name: "Claude Sonnet 4.5 (US)",
@@ -1755,6 +1863,25 @@ export const MODELS = {
 			contextWindow: 1000000,
 			maxTokens: 128000,
 		} satisfies Model<"anthropic-messages">,
+		"claude-opus-4-8": {
+			id: "claude-opus-4-8",
+			name: "Claude Opus 4.8",
+			api: "anthropic-messages",
+			provider: "anthropic",
+			baseUrl: "https://api.anthropic.com",
+			compat: {"forceAdaptiveThinking":true},
+			reasoning: true,
+			thinkingLevelMap: {"xhigh":"xhigh"},
+			input: ["text", "image"],
+			cost: {
+				input: 5,
+				output: 25,
+				cacheRead: 0.5,
+				cacheWrite: 6.25,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"anthropic-messages">,
 		"claude-sonnet-4-0": {
 			id: "claude-sonnet-4-0",
 			name: "Claude Sonnet 4 (latest)",
@@ -2434,7 +2561,7 @@ export const MODELS = {
 			provider: "azure-openai-responses",
 			baseUrl: "",
 			reasoning: true,
-			thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+			thinkingLevelMap: {"off":null,"xhigh":"xhigh","minimal":null,"low":null},
 			input: ["text", "image"],
 			cost: {
 				input: 30,
@@ -6760,7 +6887,7 @@ export const MODELS = {
 			provider: "openai",
 			baseUrl: "https://api.openai.com/v1",
 			reasoning: true,
-			thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+			thinkingLevelMap: {"off":null,"xhigh":"xhigh","minimal":null,"low":null},
 			input: ["text", "image"],
 			cost: {
 				input: 30,
@@ -7125,6 +7252,25 @@ export const MODELS = {
 			contextWindow: 1000000,
 			maxTokens: 128000,
 		} satisfies Model<"anthropic-messages">,
+		"claude-opus-4-8": {
+			id: "claude-opus-4-8",
+			name: "Claude Opus 4.8",
+			api: "anthropic-messages",
+			provider: "opencode",
+			baseUrl: "https://opencode.ai/zen",
+			compat: {"forceAdaptiveThinking":true},
+			reasoning: true,
+			thinkingLevelMap: {"xhigh":"xhigh"},
+			input: ["text", "image"],
+			cost: {
+				input: 5,
+				output: 25,
+				cacheRead: 0.5,
+				cacheWrite: 6.25,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"anthropic-messages">,
 		"claude-sonnet-4": {
 			id: "claude-sonnet-4",
 			name: "Claude Sonnet 4",
@@ -7561,7 +7707,7 @@ export const MODELS = {
 			provider: "opencode",
 			baseUrl: "https://opencode.ai/zen/v1",
 			reasoning: true,
-			thinkingLevelMap: {"off":null,"xhigh":"xhigh"},
+			thinkingLevelMap: {"off":null,"xhigh":"xhigh","minimal":null,"low":null},
 			input: ["text", "image"],
 			cost: {
 				input: 30,
@@ -8232,6 +8378,42 @@ export const MODELS = {
 			contextWindow: 1000000,
 			maxTokens: 128000,
 		} satisfies Model<"openai-completions">,
+		"anthropic/claude-opus-4.8": {
+			id: "anthropic/claude-opus-4.8",
+			name: "Anthropic: Claude Opus 4.8",
+			api: "openai-completions",
+			provider: "openrouter",
+			baseUrl: "https://openrouter.ai/api/v1",
+			reasoning: true,
+			thinkingLevelMap: {"xhigh":"xhigh"},
+			input: ["text", "image"],
+			cost: {
+				input: 5,
+				output: 25,
+				cacheRead: 0.5,
+				cacheWrite: 6.25,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"openai-completions">,
+		"anthropic/claude-opus-4.8-fast": {
+			id: "anthropic/claude-opus-4.8-fast",
+			name: "Anthropic: Claude Opus 4.8 (Fast)",
+			api: "openai-completions",
+			provider: "openrouter",
+			baseUrl: "https://openrouter.ai/api/v1",
+			reasoning: true,
+			thinkingLevelMap: {"xhigh":"xhigh"},
+			input: ["text", "image"],
+			cost: {
+				input: 10,
+				output: 50,
+				cacheRead: 1,
+				cacheWrite: 12.5,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"openai-completions">,
 		"anthropic/claude-sonnet-4": {
 			id: "anthropic/claude-sonnet-4",
 			name: "Anthropic: Claude Sonnet 4",
@@ -10637,7 +10819,7 @@ export const MODELS = {
 			provider: "openrouter",
 			baseUrl: "https://openrouter.ai/api/v1",
 			reasoning: true,
-			thinkingLevelMap: {"xhigh":"xhigh"},
+			thinkingLevelMap: {"xhigh":"xhigh","off":null,"minimal":null,"low":null},
 			input: ["text", "image"],
 			cost: {
 				input: 30,
@@ -12154,8 +12336,8 @@ export const MODELS = {
 			input: ["text"],
 			cost: {
 				input: 0.125,
-				output: 0.84,
+				output: 0.85,
-				cacheRead: 0,
+				cacheRead: 0.06,
 				cacheWrite: 0,
 			},
 			contextWindow: 131072,
@@ -13273,6 +13455,25 @@ export const MODELS = {
 			contextWindow: 1000000,
 			maxTokens: 128000,
 		} satisfies Model<"anthropic-messages">,
+		"anthropic/claude-opus-4.8": {
+			id: "anthropic/claude-opus-4.8",
+			name: "Claude Opus 4.8",
+			api: "anthropic-messages",
+			provider: "vercel-ai-gateway",
+			baseUrl: "https://ai-gateway.vercel.sh",
+			compat: {"forceAdaptiveThinking":true},
+			reasoning: true,
+			thinkingLevelMap: {"xhigh":"xhigh"},
+			input: ["text", "image"],
+			cost: {
+				input: 5,
+				output: 25,
+				cacheRead: 0.5,
+				cacheWrite: 6.25,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"anthropic-messages">,
 		"anthropic/claude-sonnet-4": {
 			id: "anthropic/claude-sonnet-4",
 			name: "Claude Sonnet 4",
@@ -14873,7 +15074,7 @@ export const MODELS = {
 			provider: "vercel-ai-gateway",
 			baseUrl: "https://ai-gateway.vercel.sh",
 			reasoning: true,
-			thinkingLevelMap: {"xhigh":"xhigh"},
+			thinkingLevelMap: {"xhigh":"xhigh","off":null,"minimal":null,"low":null},
 			input: ["text", "image"],
 			cost: {
 				input: 30,

packages/ai/src/providers/amazon-bedrock.ts

@@ -66,7 +66,7 @@ export interface BedrockOptions extends StreamOptions {
 	 * - "omitted": Thinking content is redacted but the signature still travels back
 	 *   for multi-turn continuity, reducing time-to-first-text-token.
 	 *
-	 * Note: Anthropic's API default for Claude Opus 4.7 and Mythos Preview is
+	 * Note: Anthropic's API default for Claude Opus 4.8 and Mythos Preview is
 	 * "omitted". We default to "summarized" here to keep behavior consistent with
 	 * older Claude 4 models. Only applies to Claude models on Bedrock.
 	 */
@@ -481,12 +481,14 @@ function getModelMatchCandidates(modelId: string, modelName?: string): string[]
 
 function supportsAdaptiveThinking(modelId: string, modelName?: string): boolean {
 	const candidates = getModelMatchCandidates(modelId, modelName);
-	return candidates.some((s) => s.includes("opus-4-6") || s.includes("opus-4-7") || s.includes("sonnet-4-6"));
+	return candidates.some(
+		(s) => s.includes("opus-4-6") || s.includes("opus-4-7") || s.includes("opus-4-8") || s.includes("sonnet-4-6"),
+	);
 }
 
 function supportsNativeXhighEffort(model: Model<"bedrock-converse-stream">): boolean {
 	const candidates = getModelMatchCandidates(model.id, model.name);
-	return candidates.some((s) => s.includes("opus-4-7"));
+	return candidates.some((s) => s.includes("opus-4-7") || s.includes("opus-4-8"));
 }
 
 function mapThinkingLevelToEffort(

packages/ai/test/anthropic-adaptive-thinking-models.test.ts

@@ -2,22 +2,10 @@ import { describe, expect, it } from "vitest";
 import { getModels, getProviders } from "../src/models.ts";
 import type { Api, Model } from "../src/types.ts";
 
-const EXPECTED_ADAPTIVE_THINKING_MODELS = [
+const EXPECTED_CURRENT_ADAPTIVE_THINKING_MODELS = [
-	"anthropic/claude-opus-4-6",
+	"anthropic/claude-opus-4-8",
-	"anthropic/claude-opus-4-7",
+	"opencode/claude-opus-4-8",
-	"anthropic/claude-sonnet-4-6",
+	"vercel-ai-gateway/anthropic/claude-opus-4.8",
-	"cloudflare-ai-gateway/claude-opus-4-6",
-	"cloudflare-ai-gateway/claude-opus-4-7",
-	"cloudflare-ai-gateway/claude-sonnet-4-6",
-	"github-copilot/claude-opus-4.6",
-	"github-copilot/claude-opus-4.7",
-	"github-copilot/claude-sonnet-4.6",
-	"opencode/claude-opus-4-6",
-	"opencode/claude-opus-4-7",
-	"opencode/claude-sonnet-4-6",
-	"vercel-ai-gateway/anthropic/claude-opus-4.6",
-	"vercel-ai-gateway/anthropic/claude-opus-4.7",
-	"vercel-ai-gateway/anthropic/claude-sonnet-4.6",
 ];
 
 function getAllModels(): Model<Api>[] {
@@ -25,13 +13,16 @@ function getAllModels(): Model<Api>[] {
 }
 
 describe("Anthropic adaptive thinking model metadata", () => {
-	it("marks exactly the built-in Anthropic Messages models that use adaptive thinking", () => {
+	it("marks built-in Anthropic Messages models that use adaptive thinking", () => {
 		const flaggedModels = getAllModels()
 			.filter((model): model is Model<"anthropic-messages"> => model.api === "anthropic-messages")
 			.filter((model) => model.compat?.forceAdaptiveThinking === true)
 			.map((model) => `${model.provider}/${model.id}`)
 			.sort();
 
-		expect(flaggedModels).toEqual([...EXPECTED_ADAPTIVE_THINKING_MODELS].sort());
+		expect(flaggedModels).toEqual(expect.arrayContaining([...EXPECTED_CURRENT_ADAPTIVE_THINKING_MODELS].sort()));
+		expect(flaggedModels).toEqual(
+			flaggedModels.filter((modelId) => /(opus[-.]4[-.][678]|sonnet[-.]4[-.]6)/.test(modelId)),
+		);
 	});
 });

packages/ai/test/anthropic-eager-tool-input-compat.test.ts

@@ -12,8 +12,8 @@ interface CapturedRequest {
 
 function createModel(baseUrl: string, compat?: Model<"anthropic-messages">["compat"]): Model<"anthropic-messages"> {
 	return {
-		id: "claude-opus-4-7",
+		id: "claude-opus-4-8",
-		name: "Claude Opus 4.7",
+		name: "Claude Opus 4.8",
 		api: "anthropic-messages",
 		provider: "test-anthropic",
 		baseUrl,

packages/ai/test/anthropic-force-adaptive-thinking.test.ts

@@ -85,7 +85,7 @@ describe("Anthropic forceAdaptiveThinking compat override", () => {
 
 	it("allows built-in adaptive models to opt out with compat.forceAdaptiveThinking false", async () => {
 		const model: Model<"anthropic-messages"> = {
-			...getModel("anthropic", "claude-opus-4-7"),
+			...getModel("anthropic", "claude-opus-4-8"),
 			compat: { forceAdaptiveThinking: false },
 		};
 		const payload = await capturePayload(model, { reasoning: "medium" });

packages/ai/test/anthropic-opus-4-8-smoke.test.ts

@@ -22,9 +22,9 @@ function makeContext(): Context {
 	};
 }
 
-describe.skipIf(!process.env.ANTHROPIC_API_KEY)("Anthropic Opus 4.7 smoke", () => {
+describe.skipIf(!process.env.ANTHROPIC_API_KEY)("Anthropic Opus 4.8 smoke", () => {
-	it("streams Claude Opus 4.7 with reasoning enabled", { retry: 2, timeout: 30000 }, async () => {
+	it("streams Claude Opus 4.8 with reasoning enabled", { retry: 2, timeout: 30000 }, async () => {
-		const model = getModel("anthropic", "claude-opus-4-7");
+		const model = getModel("anthropic", "claude-opus-4-8");
 		let capturedPayload: AnthropicThinkingPayload | undefined;
 		const s = streamSimple(model, makeContext(), {
 			reasoning: "high",
@@ -53,12 +53,12 @@ describe.skipIf(!process.env.ANTHROPIC_API_KEY)("Anthropic Opus 4.7 smoke", () =
 		const thinkingBlock = response.content.find((block) => block.type === "thinking");
 		expect(thinkingBlock?.type).toBe("thinking");
 		if (!thinkingBlock || thinkingBlock.type !== "thinking") {
-			throw new Error("Expected thinking block from Claude Opus 4.7");
+			throw new Error("Expected thinking block from Claude Opus 4.8");
 		}
 		expect(typeof thinkingBlock.thinkingSignature).toBe("string");
 		const thinkingSignature = thinkingBlock.thinkingSignature;
 		if (!thinkingSignature) {
-			throw new Error("Expected thinking signature from Claude Opus 4.7");
+			throw new Error("Expected thinking signature from Claude Opus 4.8");
 		}
 		expect(thinkingSignature.length).toBeGreaterThan(0);
 

packages/ai/test/anthropic-thinking-disable.test.ts

@@ -125,22 +125,22 @@ describe("Anthropic thinking disable payload", () => {
 		expect(payload.output_config).toBeUndefined();
 	});
 
-	it("sends thinking.type=disabled for Claude Opus 4.7 when thinking is off", async () => {
+	it("sends thinking.type=disabled for Claude Opus 4.8 when thinking is off", async () => {
-		const payload = await capturePayload(getModel("anthropic", "claude-opus-4-7"));
+		const payload = await capturePayload(getModel("anthropic", "claude-opus-4-8"));
 
 		expect(payload.thinking).toEqual({ type: "disabled" });
 		expect(payload.output_config).toBeUndefined();
 	});
 
-	it("uses adaptive thinking for Claude Opus 4.7 when reasoning is enabled", async () => {
+	it("uses adaptive thinking for Claude Opus 4.8 when reasoning is enabled", async () => {
-		const payload = await capturePayload(getModel("anthropic", "claude-opus-4-7"), { reasoning: "high" });
+		const payload = await capturePayload(getModel("anthropic", "claude-opus-4-8"), { reasoning: "high" });
 
 		expect(payload.thinking).toEqual({ type: "adaptive", display: "summarized" });
 		expect(payload.output_config).toEqual({ effort: "high" });
 	});
 
-	it("maps xhigh reasoning to effort=xhigh for Claude Opus 4.7", async () => {
+	it("maps xhigh reasoning to effort=xhigh for Claude Opus 4.8", async () => {
-		const payload = await capturePayload(getModel("anthropic", "claude-opus-4-7"), { reasoning: "xhigh" });
+		const payload = await capturePayload(getModel("anthropic", "claude-opus-4-8"), { reasoning: "xhigh" });
 
 		expect(payload.thinking).toEqual({ type: "adaptive", display: "summarized" });
 		expect(payload.output_config).toEqual({ effort: "xhigh" });

packages/ai/test/bedrock-endpoint-resolution.test.ts

@@ -98,7 +98,7 @@ describe("bedrock endpoint resolution", () => {
 
 	it("does not pin standard AWS endpoints when AWS_REGION is configured", async () => {
 		process.env.AWS_REGION = "us-east-2";
-		const model = getModel("amazon-bedrock", "us.anthropic.claude-opus-4-7");
+		const model = getModel("amazon-bedrock", "us.anthropic.claude-opus-4-8");
 
 		const config = await captureClientConfig(model);
 
@@ -117,7 +117,7 @@ describe("bedrock endpoint resolution", () => {
 
 	it("still passes custom Bedrock endpoints through to the SDK client", async () => {
 		process.env.AWS_REGION = "us-west-2";
-		const baseModel = getModel("amazon-bedrock", "us.anthropic.claude-opus-4-7");
+		const baseModel = getModel("amazon-bedrock", "us.anthropic.claude-opus-4-8");
 		const model: Model<"bedrock-converse-stream"> = {
 			...baseModel,
 			baseUrl: "https://bedrock-vpc.example.com",

packages/ai/test/bedrock-thinking-payload.test.ts

@@ -53,12 +53,12 @@ async function capturePayload(
 }
 
 describe("Bedrock thinking payload", () => {
-	it("uses adaptive thinking for Claude Opus 4.7 when reasoning is enabled", async () => {
+	it("uses adaptive thinking for Claude Opus 4.8 when reasoning is enabled", async () => {
 		const baseModel = getModel("amazon-bedrock", "global.anthropic.claude-opus-4-6-v1");
 		const model: Model<"bedrock-converse-stream"> = {
 			...baseModel,
-			id: "global.anthropic.claude-opus-4-7-v1",
+			id: "global.anthropic.claude-opus-4-8-v1",
-			name: "Claude Opus 4.7 (Global)",
+			name: "Claude Opus 4.8 (Global)",
 		};
 
 		const payload = await capturePayload(model);
@@ -68,12 +68,12 @@ describe("Bedrock thinking payload", () => {
 		expect(payload.additionalModelRequestFields?.anthropic_beta).toBeUndefined();
 	});
 
-	it("maps xhigh reasoning to effort=xhigh for Claude Opus 4.7", async () => {
+	it("maps xhigh reasoning to effort=xhigh for Claude Opus 4.8", async () => {
 		const baseModel = getModel("amazon-bedrock", "global.anthropic.claude-opus-4-6-v1");
 		const model: Model<"bedrock-converse-stream"> = {
 			...baseModel,
-			id: "global.anthropic.claude-opus-4-7-v1",
+			id: "global.anthropic.claude-opus-4-8-v1",
-			name: "Claude Opus 4.7 (Global)",
+			name: "Claude Opus 4.8 (Global)",
 		};
 
 		const payload = await capturePayload(model, { reasoning: "xhigh" });
@@ -101,8 +101,8 @@ describe("Bedrock thinking payload", () => {
 		const baseModel = getModel("amazon-bedrock", "global.anthropic.claude-opus-4-6-v1");
 		const model: Model<"bedrock-converse-stream"> = {
 			...baseModel,
-			id: "global.anthropic.claude-opus-4-7-v1",
+			id: "global.anthropic.claude-opus-4-8-v1",
-			name: "Claude Opus 4.7 (Global)",
+			name: "Claude Opus 4.8 (Global)",
 		};
 
 		const payload = await capturePayload(model, { region: "us-gov-west-1" });

packages/ai/test/fireworks-models.test.ts

@@ -97,8 +97,8 @@ function createFireworksModel(compat?: Model<"anthropic-messages">["compat"]): M
 
 function createAnthropicModel(): Model<"anthropic-messages"> {
 	return {
-		id: "claude-opus-4-7",
+		id: "claude-opus-4-8",
-		name: "Claude Opus 4.7",
+		name: "Claude Opus 4.8",
 		api: "anthropic-messages",
 		provider: "anthropic",
 		baseUrl: "http://127.0.0.1:0", // overridden by captureAnthropicRequest

packages/ai/test/openai-completions-response-model.test.ts

@@ -60,10 +60,10 @@ describe("openai-completions responseModel", () => {
 
 	it("surfaces routed chunk.model on responseModel without changing model", async () => {
 		mockState.chunks = [
-			{ id: "chatcmpl-1", model: "anthropic/claude-opus-4.7", choices: [{ index: 0, delta: { content: "hi" } }] },
+			{ id: "chatcmpl-1", model: "anthropic/claude-opus-4.8", choices: [{ index: 0, delta: { content: "hi" } }] },
 			{
 				id: "chatcmpl-1",
-				model: "anthropic/claude-opus-4.7",
+				model: "anthropic/claude-opus-4.8",
 				choices: [{ index: 0, delta: {}, finish_reason: "stop" }],
 				usage: {
 					prompt_tokens: 10,
@@ -81,7 +81,7 @@ describe("openai-completions responseModel", () => {
 		);
 
 		expect(message.model).toBe("openrouter/auto");
-		expect(message.responseModel).toBe("anthropic/claude-opus-4.7");
+		expect(message.responseModel).toBe("anthropic/claude-opus-4.8");
 		expect(message.provider).toBe("openrouter");
 		expect(message.stopReason).toBe("stop");
 	});

packages/ai/test/supports-xhigh.test.ts

@@ -8,8 +8,14 @@ describe("getSupportedThinkingLevels", () => {
 		expect(getSupportedThinkingLevels(model!)).toContain("xhigh");
 	});
 
-	it("includes xhigh for Anthropic Opus 4.7 on anthropic-messages API", () => {
+	it("includes xhigh for Anthropic Opus 4.8 on anthropic-messages API", () => {
-		const model = getModel("anthropic", "claude-opus-4-7");
+		const model = getModel("anthropic", "claude-opus-4-8");
+		expect(model).toBeDefined();
+		expect(getSupportedThinkingLevels(model!)).toContain("xhigh");
+	});
+
+	it("includes xhigh for Anthropic Opus 4.8 on anthropic-messages API", () => {
+		const model = getModel("anthropic", "claude-opus-4-8");
 		expect(model).toBeDefined();
 		expect(getSupportedThinkingLevels(model!)).toContain("xhigh");
 	});
@@ -26,6 +32,18 @@ describe("getSupportedThinkingLevels", () => {
 		expect(getSupportedThinkingLevels(model!)).toContain("xhigh");
 	});
 
+	it("includes only medium/high/xhigh for OpenAI GPT-5.5 Pro", () => {
+		const model = getModel("openai", "gpt-5.5-pro");
+		expect(model).toBeDefined();
+		expect(getSupportedThinkingLevels(model!)).toEqual(["medium", "high", "xhigh"]);
+	});
+
+	it("includes only medium/high/xhigh for OpenRouter GPT-5.5 Pro", () => {
+		const model = getModel("openrouter", "openai/gpt-5.5-pro");
+		expect(model).toBeDefined();
+		expect(getSupportedThinkingLevels(model!)).toEqual(["medium", "high", "xhigh"]);
+	});
+
 	it("includes only high/xhigh plus off for DeepSeek V4 Flash on the DeepSeek provider", () => {
 		const model = getModel("deepseek", "deepseek-v4-flash");
 		expect(model).toBeDefined();

packages/coding-agent/src/core/model-resolver.ts

@@ -13,7 +13,7 @@ import type { ModelRegistry } from "./model-registry.ts";
 /** Default model IDs for each known provider */
 export const defaultModelPerProvider: Record<KnownProvider, string> = {
 	"amazon-bedrock": "us.anthropic.claude-opus-4-6-v1",
-	anthropic: "claude-opus-4-7",
+	anthropic: "claude-opus-4-8",
 	openai: "gpt-5.4",
 	"azure-openai-responses": "gpt-5.4",
 	"openai-codex": "gpt-5.5",