diff --git a/daemon/cc_info_timer.go b/daemon/cc_info_timer.go
index 448defd..94d40fa 100644
--- a/daemon/cc_info_timer.go
+++ b/daemon/cc_info_timer.go
@@ -55,6 +55,9 @@ type CCInfoTimerService struct {
 	// Anthropic rate limit cache
 	rateLimitCache *anthropicRateLimitCache
 
+	// Codex rate limit cache
+	codexRateLimitCache *codexRateLimitCache
+
 	// User profile cache (permanent for daemon lifetime)
 	userLogin        string
 	userLoginFetched bool
@@ -67,7 +70,8 @@ func NewCCInfoTimerService(config *model.ShellTimeConfig) *CCInfoTimerService {
 		cache:          make(map[CCInfoTimeRange]CCInfoCache),
 		activeRanges:   make(map[CCInfoTimeRange]bool),
 		gitCache:       make(map[string]*GitCacheEntry),
-		rateLimitCache: &anthropicRateLimitCache{},
+		rateLimitCache:      &anthropicRateLimitCache{},
+		codexRateLimitCache: &codexRateLimitCache{},
 		stopChan:       make(chan struct{}),
 	}
 }
@@ -152,6 +156,11 @@ func (s *CCInfoTimerService) stopTimer() {
 	s.rateLimitCache.fetchedAt = time.Time{}
 	s.rateLimitCache.lastAttemptAt = time.Time{}
 	s.rateLimitCache.mu.Unlock()
+	s.codexRateLimitCache.mu.Lock()
+	s.codexRateLimitCache.usage = nil
+	s.codexRateLimitCache.fetchedAt = time.Time{}
+	s.codexRateLimitCache.lastAttemptAt = time.Time{}
+	s.codexRateLimitCache.mu.Unlock()
 
 	slog.Info("CC info timer stopped due to inactivity")
 }
@@ -171,6 +180,7 @@ func (s *CCInfoTimerService) timerLoop() {
 		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 		defer cancel()
 		s.fetchRateLimit(ctx)
+		s.fetchCodexRateLimit(ctx)
 	}()
 	go s.fetchUserProfile(context.Background())
 
@@ -194,6 +204,7 @@ func (s *CCInfoTimerService) timerLoop() {
 				ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 				defer cancel()
 				s.fetchRateLimit(ctx)
+				s.fetchCodexRateLimit(ctx)
 			}()
 
 		case <-s.stopChan:
@@ -551,6 +562,138 @@ func (s *CCInfoTimerService) GetCachedRateLimitError() string {
 	return s.rateLimitCache.lastError
 }
 
+// fetchCodexRateLimit fetches Codex rate limit data if cache is stale.
+func (s *CCInfoTimerService) fetchCodexRateLimit(ctx context.Context) {
+	if runtime.GOOS != "darwin" && runtime.GOOS != "linux" {
+		return
+	}
+
+	// Check cache TTL under read lock
+	s.codexRateLimitCache.mu.RLock()
+	sinceLastFetch := time.Since(s.codexRateLimitCache.fetchedAt)
+	sinceLastAttempt := time.Since(s.codexRateLimitCache.lastAttemptAt)
+	s.codexRateLimitCache.mu.RUnlock()
+
+	if sinceLastFetch < codexUsageCacheTTL || sinceLastAttempt < codexUsageCacheTTL {
+		return
+	}
+
+	// Record attempt time
+	s.codexRateLimitCache.mu.Lock()
+	s.codexRateLimitCache.lastAttemptAt = time.Now()
+	s.codexRateLimitCache.mu.Unlock()
+
+	auth, err := loadCodexAuth()
+	if err != nil || auth == nil {
+		slog.Debug("Failed to load Codex auth", slog.Any("err", err))
+		s.codexRateLimitCache.mu.Lock()
+		s.codexRateLimitCache.lastError = "auth"
+		s.codexRateLimitCache.mu.Unlock()
+		return
+	}
+
+	usage, err := fetchCodexUsage(ctx, auth)
+	if err != nil {
+		slog.Warn("Failed to fetch Codex usage", slog.Any("err", err))
+		s.codexRateLimitCache.mu.Lock()
+		s.codexRateLimitCache.lastError = shortenCodexAPIError(err)
+		s.codexRateLimitCache.mu.Unlock()
+		return
+	}
+
+	s.codexRateLimitCache.mu.Lock()
+	s.codexRateLimitCache.usage = usage
+	s.codexRateLimitCache.fetchedAt = time.Now()
+	s.codexRateLimitCache.lastError = ""
+	s.codexRateLimitCache.mu.Unlock()
+
+	// Send usage data to server (fire-and-forget)
+	go func() {
+		bgCtx, bgCancel := context.WithTimeout(context.Background(), 10*time.Second)
+		defer bgCancel()
+		s.sendCodexUsageToServer(bgCtx, usage)
+	}()
+
+	slog.Debug("Codex rate limit updated",
+		slog.String("plan", usage.Plan),
+		slog.Int("windows", len(usage.Windows)))
+}
+
+// sendCodexUsageToServer sends Codex usage data to the ShellTime server
+// for scheduling push notifications when rate limits reset.
+func (s *CCInfoTimerService) sendCodexUsageToServer(ctx context.Context, usage *CodexRateLimitData) {
+	if s.config.Token == "" {
+		return
+	}
+
+	type usageWindow struct {
+		LimitID               string  `json:"limit_id"`
+		UsagePercentage       float64 `json:"usage_percentage"`
+		ResetsAt              string  `json:"resets_at"`
+		WindowDurationMinutes int     `json:"window_duration_minutes"`
+	}
+	type usagePayload struct {
+		Plan    string        `json:"plan"`
+		Windows []usageWindow `json:"windows"`
+	}
+
+	windows := make([]usageWindow, len(usage.Windows))
+	for i, w := range usage.Windows {
+		windows[i] = usageWindow{
+			LimitID:               w.LimitID,
+			UsagePercentage:       w.UsagePercentage,
+			ResetsAt:              time.Unix(w.ResetAt, 0).UTC().Format(time.RFC3339),
+			WindowDurationMinutes: w.WindowDurationMinutes,
+		}
+	}
+
+	payload := usagePayload{
+		Plan:    usage.Plan,
+		Windows: windows,
+	}
+
+	err := model.SendHTTPRequestJSON(model.HTTPRequestOptions[usagePayload, any]{
+		Context: ctx,
+		Endpoint: model.Endpoint{
+			Token:       s.config.Token,
+			APIEndpoint: s.config.APIEndpoint,
+		},
+		Method:  "POST",
+		Path:    "/api/v1/codex-usage",
+		Payload: payload,
+		Timeout: 5 * time.Second,
+	})
+	if err != nil {
+		slog.Warn("Failed to send codex usage to server", slog.Any("err", err))
+	}
+}
+
+// GetCachedCodexRateLimit returns a copy of the cached Codex rate limit data, or nil if not available.
+func (s *CCInfoTimerService) GetCachedCodexRateLimit() *CodexRateLimitData {
+	s.codexRateLimitCache.mu.RLock()
+	defer s.codexRateLimitCache.mu.RUnlock()
+
+	if s.codexRateLimitCache.usage == nil {
+		return nil
+	}
+
+	// Return a copy
+	copy := *s.codexRateLimitCache.usage
+	windowsCopy := make([]CodexRateLimitWindow, len(copy.Windows))
+	for i, w := range copy.Windows {
+		windowsCopy[i] = w
+	}
+	copy.Windows = windowsCopy
+	return &copy
+}
+
+// GetCachedCodexRateLimitError returns the last error from Codex rate limit fetching, or empty string if none.
+func (s *CCInfoTimerService) GetCachedCodexRateLimitError() string {
+	s.codexRateLimitCache.mu.RLock()
+	defer s.codexRateLimitCache.mu.RUnlock()
+	return s.codexRateLimitCache.lastError
+}
+
 // shortenAPIError converts an Anthropic usage API error into a short string for statusline display.
 func shortenAPIError(err error) string {
 	msg := err.Error()
diff --git a/daemon/codex_ratelimit.go b/daemon/codex_ratelimit.go
new file mode 100644
index 0000000..127171f
--- /dev/null
+++ b/daemon/codex_ratelimit.go
@@ -0,0 +1,169 @@
+package daemon
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+)
+
+const codexUsageCacheTTL = 10 * time.Minute
+
+// CodexRateLimitData holds the parsed rate limit data from the Codex API
+type CodexRateLimitData struct {
+	Plan    string
+	Windows []CodexRateLimitWindow
+}
+
+// CodexRateLimitWindow holds a single rate limit window from the Codex API
+type CodexRateLimitWindow struct {
+	LimitID               string
+	UsagePercentage       float64
+	ResetAt               int64 // Unix timestamp
+	WindowDurationMinutes int
+}
+
+type codexRateLimitCache struct {
+	mu            sync.RWMutex
+	usage         *CodexRateLimitData
+	fetchedAt     time.Time
+	lastAttemptAt time.Time
+	lastError     string // short error description for statusline display
+}
+
+// codexAuthData maps the relevant fields from ~/.codex/auth.json
+type codexAuthData struct {
+	AccessToken string
+	AccountID   string
+}
+
+// codexAuthJSON maps the full ~/.codex/auth.json structure
+type codexAuthJSON struct {
+	AuthMode  string              `json:"authMode"`
+	APIKey    *string             `json:"apiKey"`
+	TokenData *codexAuthTokenData `json:"tokenData"`
+}
+
+type codexAuthTokenData struct {
+	AccessToken   string              `json:"accessToken"`
+	RefreshToken  string              `json:"refreshToken"`
+	IDTokenClaims *codexIDTokenClaims `json:"idTokenClaims"`
+}
+
+type codexIDTokenClaims struct {
+	AccountID string `json:"accountId"`
+}
+
+// loadCodexAuth reads the Codex authentication data from ~/.codex/auth.json.
+func loadCodexAuth() (*codexAuthData, error) {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get home directory: %w", err)
+	}
+
+	data, err := os.ReadFile(filepath.Join(homeDir, ".codex", "auth.json"))
+	if err != nil {
+		return nil, fmt.Errorf("codex auth file read failed: %w", err)
+	}
+
+	var auth codexAuthJSON
+	if err := json.Unmarshal(data, &auth); err != nil {
+		return nil, fmt.Errorf("failed to parse codex auth JSON: %w", err)
+	}
+
+	if auth.TokenData == nil || auth.TokenData.AccessToken == "" {
+		return nil, fmt.Errorf("no access token found in codex auth")
+	}
+
+	accountID := ""
+	if auth.TokenData.IDTokenClaims != nil {
+		accountID = auth.TokenData.IDTokenClaims.AccountID
+	}
+
+	return &codexAuthData{
+		AccessToken: auth.TokenData.AccessToken,
+		AccountID:   accountID,
+	}, nil
+}
+
+// codexUsageResponse maps the Codex usage API response
+type codexUsageResponse struct {
+	RateLimits codexRateLimitSnapshot `json:"rateLimits"`
+}
+
+type codexRateLimitSnapshot struct {
+	Plan             string                    `json:"plan"`
+	RateLimitWindows []codexRateLimitWindowRaw `json:"rateLimitWindows"`
+}
+
+type codexRateLimitWindowRaw struct {
+	LimitID               string  `json:"limitId"`
+	UsagePercentage       float64 `json:"usagePercentage"`
+	ResetAt               int64   `json:"resetAt"`
+	WindowDurationMinutes int     `json:"windowDurationMinutes"`
+}
+
+// fetchCodexUsage calls the Codex usage API and returns rate limit data.
+func fetchCodexUsage(ctx context.Context, auth *codexAuthData) (*CodexRateLimitData, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, "https://api.openai.com/api/codex/usage", nil)
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("Authorization", "Bearer "+auth.AccessToken)
+	if auth.AccountID != "" {
+		req.Header.Set("ChatGPT-Account-Id", auth.AccountID)
+	}
+	req.Header.Set("User-Agent", "shelltime-daemon")
+
+	client := &http.Client{Timeout: 5 * time.Second}
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("codex usage API returned status %d", resp.StatusCode)
+	}
+
+	var usage codexUsageResponse
+	if err := json.NewDecoder(resp.Body).Decode(&usage); err != nil {
+		return nil, fmt.Errorf("failed to decode codex usage response: %w", err)
+	}
+
+	windows := make([]CodexRateLimitWindow, len(usage.RateLimits.RateLimitWindows))
+	for i, w := range usage.RateLimits.RateLimitWindows {
+		windows[i] = CodexRateLimitWindow{
+			LimitID:               w.LimitID,
+			UsagePercentage:       w.UsagePercentage,
+			ResetAt:               w.ResetAt,
+			WindowDurationMinutes: w.WindowDurationMinutes,
+		}
+	}
+
+	return &CodexRateLimitData{
+		Plan:    usage.RateLimits.Plan,
+		Windows: windows,
+	}, nil
+}
+
+// shortenCodexAPIError converts a Codex usage API error into a short string for statusline display.
+func shortenCodexAPIError(err error) string {
+	msg := err.Error()
+
+	var status int
+	if _, scanErr := fmt.Sscanf(msg, "codex usage API returned status %d", &status); scanErr == nil {
+		return fmt.Sprintf("api:%d", status)
+	}
+
+	if len(msg) >= 6 && msg[:6] == "failed" {
+		return "api:decode"
+	}
+
+	return "network"
+}