diff --git a/package-lock.json b/package-lock.json
index 5c62f29f..100833b0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2809,9 +2809,9 @@
       }
     },
     "node_modules/@opencode-ai/sdk": {
-      "version": "1.1.11",
-      "resolved": "https://registry.npmjs.org/@opencode-ai/sdk/-/sdk-1.1.11.tgz",
-      "integrity": "sha512-vqdNDz8Q+4bygmDdQem6oxhU31ci4JVdoND4ZJNeCs9x6OIU6MM3ybgemGpzNkgtJDlfb4xCdrPaZZ6Sr3V1IQ==",
+      "version": "1.2.6",
+      "resolved": "https://registry.npmjs.org/@opencode-ai/sdk/-/sdk-1.2.6.tgz",
+      "integrity": "sha512-dWMF8Aku4h7fh8sw5tQ2FtbqRLbIFT8FcsukpxTird49ax7oUXP+gzqxM/VdxHjfksQvzLBjLZyMdDStc5g7xA==",
       "license": "MIT"
     },
     "node_modules/@pinojs/redact": {
@@ -12075,7 +12075,7 @@
       "dependencies": {
         "@git-diff-view/solid": "^0.0.8",
         "@kobalte/core": "0.13.11",
-        "@opencode-ai/sdk": "1.1.11",
+        "@opencode-ai/sdk": "1.2.6",
         "@solidjs/router": "^0.13.0",
         "@suid/icons-material": "^0.9.0",
         "@suid/material": "^0.19.0",
diff --git a/packages/ui/package.json b/packages/ui/package.json
index 7a75280f..e619fff6 100644
--- a/packages/ui/package.json
+++ b/packages/ui/package.json
@@ -13,7 +13,7 @@
   "dependencies": {
     "@git-diff-view/solid": "^0.0.8",
     "@kobalte/core": "0.13.11",
-    "@opencode-ai/sdk": "1.1.11",
+    "@opencode-ai/sdk": "1.2.6",
     "@solidjs/router": "^0.13.0",
     "@suid/icons-material": "^0.9.0",
     "@suid/material": "^0.19.0",
diff --git a/packages/ui/src/stores/message-v2/session-info.ts b/packages/ui/src/stores/message-v2/session-info.ts
index dd0fe16f..a0970ebf 100644
--- a/packages/ui/src/stores/message-v2/session-info.ts
+++ b/packages/ui/src/stores/message-v2/session-info.ts
@@ -63,9 +63,14 @@ export function updateSessionInfo(instanceId: string, sessionId: string): void {
     resolveSelectedModel(instanceProviders, latestProviderId, latestModelId)
 
   let modelOutputLimit = DEFAULT_MODEL_OUTPUT_LIMIT
+  let modelInputLimit: number | null = null
 
   if (selectedModel) {
     contextWindow = selectedModel.limit?.context ?? 0
+    const inputLimit = selectedModel.limit?.input
+    if (typeof inputLimit === "number" && inputLimit > 0) {
+      modelInputLimit = inputLimit
+    }
     const outputLimit = selectedModel.limit?.output
     if (typeof outputLimit === "number" && outputLimit > 0) {
       modelOutputLimit = Math.min(outputLimit, DEFAULT_MODEL_OUTPUT_LIMIT)
@@ -107,7 +112,13 @@ export function updateSessionInfo(instanceId: string, sessionId: string): void {
 
   const outputBudget = Math.min(modelOutputLimit, DEFAULT_MODEL_OUTPUT_LIMIT)
 
-  if (!contextAvailableFromPrevious) {
+  if (modelInputLimit !== null) {
+    // Prefer explicit input limits when provided by the API.
+    // This is used by the UI "Avail" chip.
+    contextAvailableTokens = modelInputLimit
+  }
+
+  if (!contextAvailableFromPrevious && contextAvailableTokens === null) {
     if (contextWindow > 0) {
       if (latestHasContextUsage && actualUsageTokens > 0) {
         contextAvailableTokens = Math.max(contextWindow - (actualUsageTokens + outputBudget), 0)
diff --git a/packages/ui/src/stores/session-api.ts b/packages/ui/src/stores/session-api.ts
index dc8ad63e..9fd12b2c 100644
--- a/packages/ui/src/stores/session-api.ts
+++ b/packages/ui/src/stores/session-api.ts
@@ -291,12 +291,13 @@ async function createSession(instanceId: string, agent?: string): Promise<Sessio
     const initialProvider = instanceProviders.find((p) => p.id === session.model.providerId)
     const initialModel = initialProvider?.models.find((m) => m.id === session.model.modelId)
     const initialContextWindow = initialModel?.limit?.context ?? 0
+    const initialInputLimit = initialModel?.limit?.input ?? 0
     const initialSubscriptionModel = initialModel?.cost?.input === 0 && initialModel?.cost?.output === 0
     const initialOutputLimit =
       initialModel?.limit?.output && initialModel.limit.output > 0
         ? initialModel.limit.output
         : DEFAULT_MODEL_OUTPUT_LIMIT
-    const initialContextAvailable = initialContextWindow > 0 ? initialContextWindow : null
+    const initialContextAvailable = initialInputLimit > 0 ? initialInputLimit : initialContextWindow > 0 ? initialContextWindow : null
 
     setSessionInfoByInstance((prev) => {
       const next = new Map(prev)
@@ -398,10 +399,11 @@ async function forkSession(
   const forkProvider = instanceProviders.find((p) => p.id === forkedSession.model.providerId)
   const forkModel = forkProvider?.models.find((m) => m.id === forkedSession.model.modelId)
   const forkContextWindow = forkModel?.limit?.context ?? 0
+  const forkInputLimit = forkModel?.limit?.input ?? 0
   const forkSubscriptionModel = forkModel?.cost?.input === 0 && forkModel?.cost?.output === 0
   const forkOutputLimit =
     forkModel?.limit?.output && forkModel.limit.output > 0 ? forkModel.limit.output : DEFAULT_MODEL_OUTPUT_LIMIT
-  const forkContextAvailable = forkContextWindow > 0 ? forkContextWindow : null
+  const forkContextAvailable = forkInputLimit > 0 ? forkInputLimit : forkContextWindow > 0 ? forkContextWindow : null
 
   setSessionInfoByInstance((prev) => {
     const next = new Map(prev)
diff --git a/packages/ui/src/types/session.ts b/packages/ui/src/types/session.ts
index 1cae7c21..d0a864d5 100644
--- a/packages/ui/src/types/session.ts
+++ b/packages/ui/src/types/session.ts
@@ -90,6 +90,7 @@ export interface Model {
   variantKeys?: string[]
   limit?: {
     context?: number
+    input?: number
     output?: number
   }
   cost?: {