diff --git a/lib/commands/stats.ts b/lib/commands/stats.ts
index bea2a6dc..06b2c623 100644
--- a/lib/commands/stats.ts
+++ b/lib/commands/stats.ts
@@ -45,9 +45,15 @@ function formatStatsMessage(
     lines.push("")
     lines.push("All-time:")
     lines.push("─".repeat(60))
-    lines.push(`  Tokens saved:    ~${formatTokenCount(allTime.totalTokens)}`)
-    lines.push(`  Tools pruned:     ${allTime.totalTools}`)
-    lines.push(`  Messages pruned:  ${allTime.totalMessages}`)
+    lines.push(
+        `  Tokens in|out:    ~${formatTokenCount(allTime.totalTokens)} | ~${formatTokenCount(allTime.totalSummaryTokens)}`,
+    )
+    lines.push(
+        `  Ratio:            ${formatCompressionRatio(allTime.totalTokens, allTime.totalSummaryTokens)}`,
+    )
+    lines.push(`  Time:             ${formatCompressionTime(allTime.totalDurationMs)}`)
+    lines.push(`  Messages:         ${allTime.totalMessages}`)
+    lines.push(`  Tools:            ${allTime.totalTools}`)
     lines.push(`  Sessions:         ${allTime.sessionCount}`)
 
     return lines.join("\n")
@@ -142,6 +148,8 @@ export async function handleStatsCommand(ctx: StatsCommandContext): Promise<void
         sessionMessages,
         sessionDurationMs,
         allTimeTokens: allTime.totalTokens,
+        allTimeSummaryTokens: allTime.totalSummaryTokens,
+        allTimeDurationMs: allTime.totalDurationMs,
         allTimeTools: allTime.totalTools,
         allTimeMessages: allTime.totalMessages,
     })
diff --git a/lib/state/persistence.ts b/lib/state/persistence.ts
index 2431eee3..0ff21c80 100644
--- a/lib/state/persistence.ts
+++ b/lib/state/persistence.ts
@@ -35,11 +35,20 @@ export interface PersistedNudges {
 export interface PersistedSessionState {
     sessionName?: string
     prune: PersistedPrune
+    compression?: PersistedCompressionStats
     nudges: PersistedNudges
     stats: SessionStats
     lastUpdated: string
 }
 
+export interface PersistedCompressionStats {
+    inputTokens: number
+    summaryTokens: number
+    durationMs: number
+    tools: number
+    messages: number
+}
+
 const STORAGE_DIR = join(
     process.env.XDG_DATA_HOME || join(homedir(), ".local", "share"),
     "opencode",
@@ -58,6 +67,48 @@ function getSessionFilePath(sessionId: string): string {
     return join(STORAGE_DIR, `${sessionId}.json`)
 }
 
+export function derivePersistedCompressionStats(
+    prune: PersistedPrune,
+    stats: SessionStats,
+): PersistedCompressionStats {
+    const messages = prune.messages
+    const blocks = Object.values(messages?.blocksById || {})
+    const activeBlocks = blocks.filter((block) => block.active)
+    const activeToolIds = new Set<string>(Object.keys(prune.tools || {}))
+    for (const block of activeBlocks) {
+        for (const toolId of block.effectiveToolIds || []) {
+            activeToolIds.add(toolId)
+        }
+    }
+
+    const groupedDurations = new Map<number, number>()
+    const rangeDurationMs = activeBlocks.reduce((total, block) => {
+        if (block.mode === "message") {
+            const current = groupedDurations.get(block.runId) || 0
+            groupedDurations.set(block.runId, Math.max(current, block.durationMs || 0))
+            return total
+        }
+
+        return total + (block.durationMs || 0)
+    }, 0)
+
+    const groupedDurationMs = Array.from(groupedDurations.values()).reduce(
+        (total, durationMs) => total + durationMs,
+        0,
+    )
+
+    return {
+        inputTokens: stats.totalPruneTokens,
+        summaryTokens: activeBlocks.reduce((total, block) => total + (block.summaryTokens || 0), 0),
+        durationMs: rangeDurationMs + groupedDurationMs,
+        tools: activeToolIds.size,
+        messages: Object.values(messages?.byMessageId || {}).reduce(
+            (total, entry) => total + (entry.activeBlockIds?.length > 0 ? 1 : 0),
+            0,
+        ),
+    }
+}
+
 export async function saveSessionState(
     sessionState: SessionState,
     logger: Logger,
@@ -70,25 +121,28 @@ export async function saveSessionState(
 
         await ensureStorageDir()
 
-        const state: PersistedSessionState = {
-            sessionName: sessionName,
-            prune: {
-                tools: Object.fromEntries(sessionState.prune.tools),
-                messages: {
-                    byMessageId: Object.fromEntries(sessionState.prune.messages.byMessageId),
-                    blocksById: Object.fromEntries(
-                        Array.from(sessionState.prune.messages.blocksById.entries()).map(
-                            ([blockId, block]) => [String(blockId), block],
-                        ),
-                    ),
-                    activeBlockIds: Array.from(sessionState.prune.messages.activeBlockIds),
-                    activeByAnchorMessageId: Object.fromEntries(
-                        sessionState.prune.messages.activeByAnchorMessageId,
+        const prune: PersistedPrune = {
+            tools: Object.fromEntries(sessionState.prune.tools),
+            messages: {
+                byMessageId: Object.fromEntries(sessionState.prune.messages.byMessageId),
+                blocksById: Object.fromEntries(
+                    Array.from(sessionState.prune.messages.blocksById.entries()).map(
+                        ([blockId, block]) => [String(blockId), block],
                     ),
-                    nextBlockId: sessionState.prune.messages.nextBlockId,
-                    nextRunId: sessionState.prune.messages.nextRunId,
-                },
+                ),
+                activeBlockIds: Array.from(sessionState.prune.messages.activeBlockIds),
+                activeByAnchorMessageId: Object.fromEntries(
+                    sessionState.prune.messages.activeByAnchorMessageId,
+                ),
+                nextBlockId: sessionState.prune.messages.nextBlockId,
+                nextRunId: sessionState.prune.messages.nextRunId,
             },
+        }
+
+        const state: PersistedSessionState = {
+            sessionName: sessionName,
+            prune,
+            compression: derivePersistedCompressionStats(prune, sessionState.stats),
             nudges: {
                 contextLimitAnchors: Array.from(sessionState.nudges.contextLimitAnchors),
                 turnNudgeAnchors: Array.from(sessionState.nudges.turnNudgeAnchors),
@@ -209,6 +263,8 @@ export async function loadSessionState(
 
 export interface AggregatedStats {
     totalTokens: number
+    totalSummaryTokens: number
+    totalDurationMs: number
     totalTools: number
     totalMessages: number
     sessionCount: number
@@ -217,6 +273,8 @@ export interface AggregatedStats {
 export async function loadAllSessionStats(logger: Logger): Promise<AggregatedStats> {
     const result: AggregatedStats = {
         totalTokens: 0,
+        totalSummaryTokens: 0,
+        totalDurationMs: 0,
         totalTools: 0,
         totalMessages: 0,
         sessionCount: 0,
@@ -237,13 +295,18 @@ export async function loadAllSessionStats(logger: Logger): Promise<AggregatedSta
                 const state = JSON.parse(content) as PersistedSessionState
 
                 if (state?.stats?.totalPruneTokens && state?.prune) {
-                    result.totalTokens += state.stats.totalPruneTokens
-                    result.totalTools += state.prune.tools
-                        ? Object.keys(state.prune.tools).length
-                        : 0
-                    result.totalMessages += state.prune.messages?.byMessageId
-                        ? Object.keys(state.prune.messages.byMessageId).length
-                        : 0
+                    const compression =
+                        state.compression ||
+                        // LEGACY: Older session files do not have derived compression stats yet.
+                        // Keep this reconstruction path during migration, then delete it once old
+                        // persisted state is no longer relevant.
+                        derivePersistedCompressionStats(state.prune, state.stats)
+
+                    result.totalTokens += compression.inputTokens
+                    result.totalSummaryTokens += compression.summaryTokens
+                    result.totalDurationMs += compression.durationMs
+                    result.totalTools += compression.tools
+                    result.totalMessages += compression.messages
                     result.sessionCount++
                 }
             } catch {
diff --git a/tests/persistence.test.ts b/tests/persistence.test.ts
new file mode 100644
index 00000000..22f8812d
--- /dev/null
+++ b/tests/persistence.test.ts
@@ -0,0 +1,174 @@
+import assert from "node:assert/strict"
+import test from "node:test"
+import { mkdirSync } from "node:fs"
+import { rm, writeFile, readFile } from "node:fs/promises"
+import { homedir } from "node:os"
+import { join } from "node:path"
+import { Logger } from "../lib/logger"
+import { saveSessionState, loadAllSessionStats } from "../lib/state/persistence"
+import { createSessionState, type CompressionBlock } from "../lib/state"
+
+const STORAGE_DIR = join(
+    process.env.XDG_DATA_HOME || join(homedir(), ".local", "share"),
+    "opencode",
+    "storage",
+    "plugin",
+    "dcp",
+)
+
+function buildBlock(
+    blockId: number,
+    runId: number,
+    mode: "message" | "range",
+    durationMs: number,
+): CompressionBlock {
+    return {
+        blockId,
+        runId,
+        active: true,
+        deactivatedByUser: false,
+        compressedTokens: 10,
+        summaryTokens: 5,
+        durationMs,
+        mode,
+        topic: `topic-${blockId}`,
+        batchTopic: `batch-${runId}`,
+        startId: `m${blockId}`,
+        endId: `m${blockId}`,
+        anchorMessageId: `msg-${blockId}`,
+        compressMessageId: `origin-${runId}`,
+        compressCallId: `call-${blockId}`,
+        includedBlockIds: [],
+        consumedBlockIds: [],
+        parentBlockIds: [],
+        directMessageIds: [`msg-${blockId}`],
+        directToolIds: [],
+        effectiveMessageIds: [`msg-${blockId}`],
+        effectiveToolIds: blockId === 1 ? ["bash"] : [],
+        createdAt: blockId,
+        summary: `summary-${blockId}`,
+    }
+}
+
+test("saveSessionState persists derived compression stats", async () => {
+    mkdirSync(STORAGE_DIR, { recursive: true })
+    const sessionId = `ses_persistence_save_${Date.now()}`
+    const filePath = join(STORAGE_DIR, `${sessionId}.json`)
+    const state = createSessionState()
+    state.sessionId = sessionId
+    state.stats.totalPruneTokens = 120
+    state.prune.tools.set("read", 1)
+    state.prune.messages.byMessageId.set("msg-1", {
+        tokenCount: 10,
+        allBlockIds: [1],
+        activeBlockIds: [1],
+    })
+    state.prune.messages.byMessageId.set("msg-2", {
+        tokenCount: 10,
+        allBlockIds: [2],
+        activeBlockIds: [2],
+    })
+
+    const first = buildBlock(1, 10, "message", 225)
+    const second = buildBlock(2, 10, "message", 225)
+    state.prune.messages.blocksById.set(1, first)
+    state.prune.messages.blocksById.set(2, second)
+    state.prune.messages.activeBlockIds.add(1)
+    state.prune.messages.activeBlockIds.add(2)
+
+    try {
+        await saveSessionState(state, new Logger(false))
+        const saved = JSON.parse(await readFile(filePath, "utf-8"))
+
+        assert.deepEqual(saved.compression, {
+            inputTokens: 120,
+            summaryTokens: 10,
+            durationMs: 225,
+            tools: 2,
+            messages: 2,
+        })
+    } finally {
+        await rm(filePath, { force: true })
+    }
+})
+
+test("loadAllSessionStats sums derived stats and uses LEGACY fallback", async () => {
+    mkdirSync(STORAGE_DIR, { recursive: true })
+    const logger = new Logger(false)
+    const before = await loadAllSessionStats(logger)
+    const freshId = `ses_persistence_fresh_${Date.now()}`
+    const legacyId = `ses_persistence_legacy_${Date.now()}`
+    const freshPath = join(STORAGE_DIR, `${freshId}.json`)
+    const legacyPath = join(STORAGE_DIR, `${legacyId}.json`)
+
+    const baseState = {
+        nudges: {
+            contextLimitAnchors: [],
+            turnNudgeAnchors: [],
+            iterationNudgeAnchors: [],
+        },
+        lastUpdated: new Date().toISOString(),
+    }
+
+    const fresh = {
+        ...baseState,
+        prune: {
+            tools: {},
+            messages: {
+                byMessageId: {},
+                blocksById: {},
+                activeBlockIds: [],
+                activeByAnchorMessageId: {},
+                nextBlockId: 1,
+                nextRunId: 1,
+            },
+        },
+        stats: { pruneTokenCounter: 0, totalPruneTokens: 100 },
+        compression: {
+            inputTokens: 100,
+            summaryTokens: 25,
+            durationMs: 700,
+            tools: 3,
+            messages: 4,
+        },
+    }
+
+    const legacy = {
+        ...baseState,
+        prune: {
+            tools: { read: 1 },
+            messages: {
+                byMessageId: {
+                    "msg-1": { tokenCount: 10, allBlockIds: [1], activeBlockIds: [1] },
+                    "msg-2": { tokenCount: 10, allBlockIds: [2], activeBlockIds: [2] },
+                },
+                blocksById: {
+                    "1": buildBlock(1, 20, "message", 300),
+                    "2": buildBlock(2, 20, "message", 300),
+                    "3": buildBlock(3, 21, "range", 80),
+                },
+                activeBlockIds: [1, 2, 3],
+                activeByAnchorMessageId: { "msg-1": 1, "msg-2": 2, "msg-3": 3 },
+                nextBlockId: 4,
+                nextRunId: 22,
+            },
+        },
+        stats: { pruneTokenCounter: 0, totalPruneTokens: 90 },
+    }
+
+    try {
+        await writeFile(freshPath, JSON.stringify(fresh, null, 2), "utf-8")
+        await writeFile(legacyPath, JSON.stringify(legacy, null, 2), "utf-8")
+        const after = await loadAllSessionStats(logger)
+
+        assert.equal(after.totalTokens - before.totalTokens, 190)
+        assert.equal(after.totalSummaryTokens - before.totalSummaryTokens, 40)
+        assert.equal(after.totalDurationMs - before.totalDurationMs, 1080)
+        assert.equal(after.totalTools - before.totalTools, 5)
+        assert.equal(after.totalMessages - before.totalMessages, 6)
+        assert.equal(after.sessionCount - before.sessionCount, 2)
+    } finally {
+        await rm(freshPath, { force: true })
+        await rm(legacyPath, { force: true })
+    }
+})