feat(provider): add adaptive thinking and 1M context support for Claude Opus 4.6

package.json

@@ -40,7 +40,7 @@
       "@tailwindcss/vite": "4.1.11",
       "diff": "8.0.2",
       "dompurify": "3.3.1",
-      "ai": "5.0.124",
+      "ai": "6.0.72",
       "hono": "4.10.7",
       "hono-openapi": "1.1.2",
       "fuzzysort": "3.1.0",

packages/opencode/package.json

@@ -51,25 +51,25 @@
     "@actions/core": "1.11.1",
     "@actions/github": "6.0.1",
     "@agentclientprotocol/sdk": "0.14.1",
-    "@ai-sdk/amazon-bedrock": "3.0.74",
-    "@ai-sdk/anthropic": "2.0.58",
-    "@ai-sdk/azure": "2.0.91",
-    "@ai-sdk/cerebras": "1.0.36",
-    "@ai-sdk/cohere": "2.0.22",
-    "@ai-sdk/deepinfra": "1.0.33",
-    "@ai-sdk/gateway": "2.0.30",
-    "@ai-sdk/google": "2.0.52",
-    "@ai-sdk/google-vertex": "3.0.98",
-    "@ai-sdk/groq": "2.0.34",
-    "@ai-sdk/mistral": "2.0.27",
-    "@ai-sdk/openai": "2.0.89",
-    "@ai-sdk/openai-compatible": "1.0.32",
-    "@ai-sdk/perplexity": "2.0.23",
-    "@ai-sdk/provider": "2.0.1",
-    "@ai-sdk/provider-utils": "3.0.20",
-    "@ai-sdk/togetherai": "1.0.34",
-    "@ai-sdk/vercel": "1.0.33",
-    "@ai-sdk/xai": "2.0.51",
+    "@ai-sdk/amazon-bedrock": "4.0.49",
+    "@ai-sdk/anthropic": "3.0.37",
+    "@ai-sdk/azure": "3.0.26",
+    "@ai-sdk/cerebras": "2.0.30",
+    "@ai-sdk/cohere": "3.0.18",
+    "@ai-sdk/deepinfra": "2.0.31",
+    "@ai-sdk/gateway": "3.0.35",
+    "@ai-sdk/google": "3.0.21",
+    "@ai-sdk/google-vertex": "4.0.44",
+    "@ai-sdk/groq": "3.0.21",
+    "@ai-sdk/mistral": "3.0.18",
+    "@ai-sdk/openai": "3.0.25",
+    "@ai-sdk/openai-compatible": "2.0.27",
+    "@ai-sdk/perplexity": "3.0.17",
+    "@ai-sdk/provider": "3.0.7",
+    "@ai-sdk/provider-utils": "4.0.13",
+    "@ai-sdk/togetherai": "2.0.30",
+    "@ai-sdk/vercel": "2.0.29",
+    "@ai-sdk/xai": "3.0.47",
     "@clack/prompts": "1.0.0-alpha.1",
     "@gitlab/gitlab-ai-provider": "3.4.0",
     "@gitlab/opencode-gitlab-auth": "1.3.2",

packages/opencode/src/plugin/index.ts

@@ -16,7 +16,7 @@ import { gitlabAuthPlugin as GitlabAuthPlugin } from "@gitlab/opencode-gitlab-au
 export namespace Plugin {
   const log = Log.create({ service: "plugin" })
 
-  const BUILTIN = ["opencode-anthropic-auth@0.0.13"]
+  const BUILTIN = ["github:okhsunrog/opencode-anthropic-auth#feat/oauth-context-cap"]
 
   // Built-in plugins that are directly imported (not installed from npm)
   const INTERNAL_PLUGINS: PluginInstance[] = [CodexAuthPlugin, CopilotAuthPlugin, GitlabAuthPlugin]

packages/opencode/src/provider/provider.ts

@@ -3,7 +3,13 @@ import os from "os"
 import fuzzysort from "fuzzysort"
 import { Config } from "../config/config"
 import { mapValues, mergeDeep, omit, pickBy, sortBy } from "remeda"
-import { NoSuchModelError, type Provider as SDK } from "ai"
+import { NoSuchModelError } from "ai"
+
+// SDK type for provider factories - we only use languageModel() so we don't require all Provider methods
+type SDK = {
+  languageModel: (modelId: string) => any
+  [key: string]: any
+}
 import { Log } from "../util/log"
 import { BunProc } from "../bun"
 import { Plugin } from "../plugin"
@@ -24,7 +30,8 @@ import { createVertex } from "@ai-sdk/google-vertex"
 import { createVertexAnthropic } from "@ai-sdk/google-vertex/anthropic"
 import { createOpenAI } from "@ai-sdk/openai"
 import { createOpenAICompatible } from "@ai-sdk/openai-compatible"
-import { createOpenRouter, type LanguageModelV2 } from "@openrouter/ai-sdk-provider"
+import { createOpenRouter } from "@openrouter/ai-sdk-provider"
+import type { LanguageModelV3 } from "@ai-sdk/provider"
 import { createOpenaiCompatible as createGitHubCopilotOpenAICompatible } from "./sdk/copilot"
 import { createXai } from "@ai-sdk/xai"
 import { createMistral } from "@ai-sdk/mistral"
@@ -94,7 +101,7 @@ export namespace Provider {
         options: {
           headers: {
             "anthropic-beta":
-              "claude-code-20250219,interleaved-thinking-2025-05-14,fine-grained-tool-streaming-2025-05-14",
+              "claude-code-20250219,interleaved-thinking-2025-05-14,fine-grained-tool-streaming-2025-05-14,adaptive-thinking-2026-01-28,context-1m-2025-08-07",
           },
         },
       }
@@ -513,7 +520,8 @@ export namespace Provider {
         autoload: true,
         async getModel(_sdk: any, modelID: string, _options?: Record<string, any>) {
           // Model IDs use Unified API format: provider/model (e.g., "anthropic/claude-sonnet-4-5")
-          return aigateway(unified(modelID))
+          // Cast to any as ai-gateway-provider may return V2 models
+          return aigateway(unified(modelID) as any) as any
         },
         options: {},
       }
@@ -710,7 +718,7 @@ export namespace Provider {
     }
 
     const providers: { [providerID: string]: Info } = {}
-    const languages = new Map<string, LanguageModelV2>()
+    const languages = new Map<string, LanguageModelV3>()
     const modelLoaders: {
       [providerID: string]: CustomModelLoader
     } = {}
@@ -1102,7 +1110,7 @@ export namespace Provider {
     return info
   }
 
-  export async function getLanguage(model: Model): Promise<LanguageModelV2> {
+  export async function getLanguage(model: Model): Promise<LanguageModelV3> {
     const s = await state()
     const key = `${model.providerID}/${model.id}`
     if (s.models.has(key)) return s.models.get(key)!

packages/opencode/src/provider/sdk/copilot/responses/tool/code-interpreter.ts

@@ -1,4 +1,4 @@
-import { createProviderDefinedToolFactoryWithOutputSchema } from "@ai-sdk/provider-utils"
+import { createProviderToolFactoryWithOutputSchema } from "@ai-sdk/provider-utils"
 import { z } from "zod/v4"
 
 export const codeInterpreterInputSchema = z.object({
@@ -37,7 +37,7 @@ type CodeInterpreterArgs = {
   container?: string | { fileIds?: string[] }
 }
 
-export const codeInterpreterToolFactory = createProviderDefinedToolFactoryWithOutputSchema<
+export const codeInterpreterToolFactory = createProviderToolFactoryWithOutputSchema<
   {
     /**
      * The code to run, or null if not available.
@@ -76,7 +76,6 @@ export const codeInterpreterToolFactory = createProviderDefinedToolFactoryWithOu
   CodeInterpreterArgs
 >({
   id: "openai.code_interpreter",
-  name: "code_interpreter",
   inputSchema: codeInterpreterInputSchema,
   outputSchema: codeInterpreterOutputSchema,
 })

packages/opencode/src/provider/sdk/copilot/responses/tool/file-search.ts

@@ -1,4 +1,4 @@
-import { createProviderDefinedToolFactoryWithOutputSchema } from "@ai-sdk/provider-utils"
+import { createProviderToolFactoryWithOutputSchema } from "@ai-sdk/provider-utils"
 import type {
   OpenAIResponsesFileSearchToolComparisonFilter,
   OpenAIResponsesFileSearchToolCompoundFilter,
@@ -43,7 +43,7 @@ export const fileSearchOutputSchema = z.object({
     .nullable(),
 })
 
-export const fileSearch = createProviderDefinedToolFactoryWithOutputSchema<
+export const fileSearch = createProviderToolFactoryWithOutputSchema<
   {},
   {
     /**
@@ -122,7 +122,6 @@ export const fileSearch = createProviderDefinedToolFactoryWithOutputSchema<
   }
 >({
   id: "openai.file_search",
-  name: "file_search",
   inputSchema: z.object({}),
   outputSchema: fileSearchOutputSchema,
 })

packages/opencode/src/provider/sdk/copilot/responses/tool/image-generation.ts

@@ -1,4 +1,4 @@
-import { createProviderDefinedToolFactoryWithOutputSchema } from "@ai-sdk/provider-utils"
+import { createProviderToolFactoryWithOutputSchema } from "@ai-sdk/provider-utils"
 import { z } from "zod/v4"
 
 export const imageGenerationArgsSchema = z
@@ -92,7 +92,7 @@ type ImageGenerationArgs = {
   size?: "auto" | "1024x1024" | "1024x1536" | "1536x1024"
 }
 
-const imageGenerationToolFactory = createProviderDefinedToolFactoryWithOutputSchema<
+const imageGenerationToolFactory = createProviderToolFactoryWithOutputSchema<
   {},
   {
     /**
@@ -103,7 +103,6 @@ const imageGenerationToolFactory = createProviderDefinedToolFactoryWithOutputSch
   ImageGenerationArgs
 >({
   id: "openai.image_generation",
-  name: "image_generation",
   inputSchema: z.object({}),
   outputSchema: imageGenerationOutputSchema,
 })

packages/opencode/src/provider/sdk/copilot/responses/tool/local-shell.ts

@@ -1,4 +1,4 @@
-import { createProviderDefinedToolFactoryWithOutputSchema } from "@ai-sdk/provider-utils"
+import { createProviderToolFactoryWithOutputSchema } from "@ai-sdk/provider-utils"
 import { z } from "zod/v4"
 
 export const localShellInputSchema = z.object({
@@ -16,7 +16,7 @@ export const localShellOutputSchema = z.object({
   output: z.string(),
 })
 
-export const localShell = createProviderDefinedToolFactoryWithOutputSchema<
+export const localShell = createProviderToolFactoryWithOutputSchema<
   {
     /**
      * Execute a shell command on the server.
@@ -59,7 +59,6 @@ export const localShell = createProviderDefinedToolFactoryWithOutputSchema<
   {}
 >({
   id: "openai.local_shell",
-  name: "local_shell",
   inputSchema: localShellInputSchema,
   outputSchema: localShellOutputSchema,
 })

packages/opencode/src/provider/sdk/copilot/responses/tool/web-search-preview.ts

@@ -1,4 +1,4 @@
-import { createProviderDefinedToolFactory } from "@ai-sdk/provider-utils"
+import { createProviderToolFactory } from "@ai-sdk/provider-utils"
 import { z } from "zod/v4"
 
 // Args validation schema
@@ -40,7 +40,7 @@ export const webSearchPreviewArgsSchema = z.object({
     .optional(),
 })
 
-export const webSearchPreview = createProviderDefinedToolFactory<
+export const webSearchPreview = createProviderToolFactory<
   {
     // Web search doesn't take input parameters - it's controlled by the prompt
   },
@@ -81,7 +81,6 @@ export const webSearchPreview = createProviderDefinedToolFactory<
   }
 >({
   id: "openai.web_search_preview",
-  name: "web_search_preview",
   inputSchema: z.object({
     action: z
       .discriminatedUnion("type", [

packages/opencode/src/provider/sdk/copilot/responses/tool/web-search.ts

@@ -1,4 +1,4 @@
-import { createProviderDefinedToolFactory } from "@ai-sdk/provider-utils"
+import { createProviderToolFactory } from "@ai-sdk/provider-utils"
 import { z } from "zod/v4"
 
 export const webSearchArgsSchema = z.object({
@@ -21,7 +21,7 @@ export const webSearchArgsSchema = z.object({
     .optional(),
 })
 
-export const webSearchToolFactory = createProviderDefinedToolFactory<
+export const webSearchToolFactory = createProviderToolFactory<
   {
     // Web search doesn't take input parameters - it's controlled by the prompt
   },
@@ -74,7 +74,6 @@ export const webSearchToolFactory = createProviderDefinedToolFactory<
   }
 >({
   id: "openai.web_search",
-  name: "web_search",
   inputSchema: z.object({
     action: z
       .discriminatedUnion("type", [

packages/opencode/src/provider/transform.ts

@@ -79,7 +79,7 @@ export namespace ProviderTransform {
               }
             }
             return part
-          })
+          }) as typeof msg.content
         }
         return msg
       })
@@ -95,7 +95,7 @@ export namespace ProviderTransform {
         const nextMsg = msgs[i + 1]
 
         if ((msg.role === "assistant" || msg.role === "tool") && Array.isArray(msg.content)) {
-          msg.content = msg.content.map((part) => {
+          msg.content = (msg.content.map((part) => {
             if ((part.type === "tool-call" || part.type === "tool-result") && "toolCallId" in part) {
               // Mistral requires alphanumeric tool call IDs with exactly 9 characters
               const normalizedId = part.toolCallId
@@ -109,7 +109,7 @@ export namespace ProviderTransform {
               }
             }
             return part
-          })
+          })) as typeof msg.content
         }
 
         result.push(msg)
@@ -195,7 +195,7 @@ export namespace ProviderTransform {
       const shouldUseContentOptions = !useMessageLevelOptions && Array.isArray(msg.content) && msg.content.length > 0
 
       if (shouldUseContentOptions) {
-        const lastContent = msg.content[msg.content.length - 1]
+        const lastContent = msg.content[msg.content.length - 1] as any
         if (lastContent && typeof lastContent === "object") {
           lastContent.providerOptions = mergeDeep(lastContent.providerOptions ?? {}, providerOptions)
           continue
@@ -277,7 +277,7 @@ export namespace ProviderTransform {
         return {
           ...msg,
           providerOptions: remap(msg.providerOptions),
-          content: msg.content.map((part) => ({ ...part, providerOptions: remap(part.providerOptions) })),
+          content: msg.content.map((part) => ({ ...part, providerOptions: remap((part as any).providerOptions) })),
         } as typeof msg
       })
     }
@@ -453,6 +453,29 @@ export namespace ProviderTransform {
       // https://v5.ai-sdk.dev/providers/ai-sdk-providers/anthropic
       case "@ai-sdk/google-vertex/anthropic":
         // https://v5.ai-sdk.dev/providers/ai-sdk-providers/google-vertex#anthropic-provider
+        // Opus 4.6 uses adaptive thinking with effort parameter
+        // https://docs.anthropic.com/en/docs/build-with-claude/adaptive-thinking
+        if (id.includes("opus-4-6")) {
+          return {
+            low: {
+              thinking: { type: "adaptive" },
+              effort: "low",
+            },
+            medium: {
+              thinking: { type: "adaptive" },
+              effort: "medium",
+            },
+            high: {
+              thinking: { type: "adaptive" },
+              effort: "high",
+            },
+            max: {
+              thinking: { type: "adaptive" },
+              effort: "max",
+            },
+          }
+        }
+        // Older models use manual thinking with budgetTokens
         return {
           high: {
             thinking: {

packages/opencode/src/session/compaction.ts

@@ -149,7 +149,7 @@ export namespace SessionCompaction {
       tools: {},
       system: [],
       messages: [
-        ...MessageV2.toModelMessages(input.messages, model),
+        ...(await MessageV2.toModelMessages(input.messages, model)),
         {
           role: "user",
           content: [

packages/opencode/src/session/index.ts

@@ -443,18 +443,19 @@ export namespace Session {
       metadata: z.custom<ProviderMetadata>().optional(),
     }),
     (input) => {
-      const cacheReadInputTokens = input.usage.cachedInputTokens ?? 0
-      const cacheWriteInputTokens = (input.metadata?.["anthropic"]?.["cacheCreationInputTokens"] ??
-        // @ts-expect-error
-        input.metadata?.["bedrock"]?.["usage"]?.["cacheWriteInputTokens"] ??
-        // @ts-expect-error
-        input.metadata?.["venice"]?.["usage"]?.["cacheCreationInputTokens"] ??
-        0) as number
-
-      const excludesCachedTokens = !!(input.metadata?.["anthropic"] || input.metadata?.["bedrock"])
-      const adjustedInputTokens = excludesCachedTokens
-        ? (input.usage.inputTokens ?? 0)
-        : (input.usage.inputTokens ?? 0) - cacheReadInputTokens - cacheWriteInputTokens
+      const cacheReadInputTokens = input.usage.inputTokenDetails?.cacheReadTokens ?? input.usage.cachedInputTokens ?? 0
+      const cacheWriteInputTokens =
+        input.usage.inputTokenDetails?.cacheWriteTokens ??
+        ((input.metadata?.["anthropic"]?.["cacheCreationInputTokens"] ??
+          // @ts-expect-error
+          input.metadata?.["bedrock"]?.["usage"]?.["cacheWriteInputTokens"] ??
+          // @ts-expect-error
+          input.metadata?.["venice"]?.["usage"]?.["cacheCreationInputTokens"] ??
+          0) as number)
+
+      const adjustedInputTokens =
+        input.usage.inputTokenDetails?.noCacheTokens ??
+        (input.usage.inputTokens ?? 0) - cacheReadInputTokens - cacheWriteInputTokens
       const safe = (value: number) => {
         if (!Number.isFinite(value)) return 0
         return value

packages/opencode/src/session/llm.ts

@@ -41,7 +41,7 @@ export namespace LLM {
     retries?: number
   }
 
-  export type StreamOutput = StreamTextResult<ToolSet, unknown>
+  export type StreamOutput = StreamTextResult<ToolSet, any>
 
   export async function stream(input: StreamInput) {
     const l = log
@@ -245,6 +245,7 @@ export namespace LLM {
         model: language,
         middleware: [
           {
+            specificationVersion: "v3" as const,
             async transformParams(args) {
               if (args.type === "stream") {
                 // @ts-expect-error