diff --git a/changelog/unreleased/codex-free-login-status.md b/changelog/unreleased/codex-free-login-status.md
new file mode 100644
index 0000000..44e94cf
--- /dev/null
+++ b/changelog/unreleased/codex-free-login-status.md
@@ -0,0 +1,7 @@
+### English
+
+- Codex free accounts no longer stay on login failed after a successful sign-in. The console now reads the ChatGPT account id from the login token, and an account that already signed in recovers on the next refresh.
+
+### 中文
+
+- Codex 免费账号登录成功后不再一直显示登录失败。控制台会从登录令牌里读出 ChatGPT 账号 ID，已经登录过的账号会在下次刷新时自动恢复。
diff --git a/internal/providers/codex/client.go b/internal/providers/codex/client.go
index 57c9021..fb95c6e 100644
--- a/internal/providers/codex/client.go
+++ b/internal/providers/codex/client.go
@@ -406,11 +406,29 @@ func parseTokenResponse(payload []byte) (Credential, error) {
 	if tok.ExpiresIn > 0 {
 		credential.ExpiresAt = time.Now().Add(time.Duration(tok.ExpiresIn) * time.Second).Unix()
 	}
-	if claims := parseJWTClaims(tok.IDToken); claims != nil {
-		credential.AccountID = firstNonEmpty(claims.AccountID, claims.ChatGPTAccountID)
+	applyJWTIdentity(&credential, tok.IDToken)
+	return credential, nil
+}
+
+// applyJWTIdentity fills AccountID and Email from an id_token. OpenAI puts
+// the ChatGPT account id under https://api.openai.com/auth.chatgpt_account_id,
+// not a top-level account_id. Free accounts only carry the nested claim, so
+// reading the top-level field alone leaves AccountID empty and the console
+// treats a usable login as incomplete.
+func applyJWTIdentity(credential *Credential, token string) {
+	if credential == nil {
+		return
+	}
+	claims := parseJWTClaims(token)
+	if claims == nil {
+		return
+	}
+	if accountID := firstNonEmpty(claims.ChatGPTAccountID, claims.AccountID); accountID != "" {
+		credential.AccountID = accountID
+	}
+	if claims.Email != "" {
 		credential.Email = claims.Email
 	}
-	return credential, nil
 }
 
 type jwtClaims struct {
@@ -429,23 +447,35 @@ func parseJWTClaims(token string) *jwtClaims {
 		return nil
 	}
 	var claims jwtClaims
-	// account_id can nest under https://api.openai.com/auth.
+	if json.Unmarshal(payload, &claims) != nil {
+		return nil
+	}
+	// OpenAI nests the ChatGPT identity under https://api.openai.com/auth.
+	// A free account has chatgpt_account_id there and no top-level account_id.
 	var raw map[string]json.RawMessage
 	if json.Unmarshal(payload, &raw) != nil {
-		return nil
+		return &claims
 	}
-	_ = json.Unmarshal(payload, &claims)
-	if claims.AccountID == "" {
-		for key, value := range raw {
-			if !strings.HasSuffix(key, "auth") {
-				continue
-			}
-			var nested struct {
-				AccountID string `json:"account_id"`
-			}
-			if json.Unmarshal(value, &nested) == nil && nested.AccountID != "" {
-				claims.AccountID = nested.AccountID
-			}
+	for key, value := range raw {
+		if !strings.HasSuffix(key, "/auth") && !strings.HasSuffix(key, "auth") {
+			continue
+		}
+		var nested struct {
+			AccountID        string `json:"account_id"`
+			ChatGPTAccountID string `json:"chatgpt_account_id"`
+			Email            string `json:"email"`
+		}
+		if json.Unmarshal(value, &nested) != nil {
+			continue
+		}
+		if claims.ChatGPTAccountID == "" {
+			claims.ChatGPTAccountID = nested.ChatGPTAccountID
+		}
+		if claims.AccountID == "" {
+			claims.AccountID = firstNonEmpty(nested.AccountID, nested.ChatGPTAccountID)
+		}
+		if claims.Email == "" {
+			claims.Email = nested.Email
 		}
 	}
 	return &claims
@@ -465,6 +495,17 @@ func (c *Client) credential(ctx context.Context, accountID string) (Credential,
 	if err != nil {
 		return Credential{}, err
 	}
+	// Logins that missed the nested chatgpt_account_id stored a usable token
+	// with an empty AccountID. Probe then reported login failure even though
+	// chat still works. Recover the id from the stored id_token and persist it.
+	if strings.TrimSpace(credential.AccountID) == "" && strings.TrimSpace(credential.IDToken) != "" {
+		applyJWTIdentity(&credential, credential.IDToken)
+		if strings.TrimSpace(credential.AccountID) != "" {
+			if encoded, encErr := credential.Encode(); encErr == nil {
+				_ = c.store.SaveCredentialPayload(ctx, accountID, CredentialFormat, encoded)
+			}
+		}
+	}
 	if !credential.needsRefresh(time.Now()) {
 		return credential, nil
 	}
diff --git a/internal/providers/codex/s04_interfaces_test.go b/internal/providers/codex/s04_interfaces_test.go
index e996c72..1992b20 100644
--- a/internal/providers/codex/s04_interfaces_test.go
+++ b/internal/providers/codex/s04_interfaces_test.go
@@ -2,6 +2,7 @@ package codex
 
 import (
 	"context"
+	"encoding/base64"
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
@@ -28,7 +29,13 @@ func (s testStore) LoadCredentialPayload(_ context.Context, accountID string) (s
 	}
 	return CredentialFormat, payload, nil
 }
-func (testStore) SaveCredentialPayload(context.Context, string, string, []byte) error { return nil }
+func (s testStore) SaveCredentialPayload(_ context.Context, accountID, _ string, payload []byte) error {
+	if s.items == nil {
+		return nil
+	}
+	s.items[accountID] = payload
+	return nil
+}
 func (testStore) Observe(context.Context, string, string, string, string, string) error {
 	return nil
 }
@@ -84,6 +91,66 @@ func TestCredentialRoundTrip(t *testing.T) {
 	}
 }
 
+func unsignedJWT(claims map[string]any) string {
+	header := base64.RawURLEncoding.EncodeToString([]byte(`{"alg":"none","typ":"JWT"}`))
+	payload, _ := json.Marshal(claims)
+	return header + "." + base64.RawURLEncoding.EncodeToString(payload) + ".sig"
+}
+
+func TestParseTokenResponseReadsNestedChatGPTAccount(t *testing.T) {
+	idToken := unsignedJWT(map[string]any{
+		"email": "free@example.com",
+		"https://api.openai.com/auth": map[string]any{
+			"chatgpt_account_id": "acct_free",
+			"chatgpt_plan_type":  "free",
+		},
+	})
+	body, _ := json.Marshal(map[string]any{
+		"access_token":  "at",
+		"refresh_token": "rt",
+		"id_token":      idToken,
+		"expires_in":    3600,
+	})
+	cred, err := parseTokenResponse(body)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if cred.AccountID != "acct_free" || cred.Email != "free@example.com" || !cred.Ready() {
+		t.Fatalf("credential %+v", cred)
+	}
+}
+
+func TestProbeRecoversMissingAccountIDFromIDToken(t *testing.T) {
+	idToken := unsignedJWT(map[string]any{
+		"email": "free@example.com",
+		"https://api.openai.com/auth": map[string]any{
+			"chatgpt_account_id": "acct_free",
+			"chatgpt_plan_type":  "free",
+		},
+	})
+	payload, _ := json.Marshal(Credential{
+		IDToken:      idToken,
+		AccessToken:  "at",
+		RefreshToken: "rt",
+		ExpiresAt:    time.Now().Add(time.Hour).Unix(),
+	})
+	store := testStore{items: map[string][]byte{"acc-1": payload}}
+	health, err := NewClient(store).Probe(context.Background(), "acc-1")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !health.Ready || health.LastError != "" || health.UID != "free@example.com" {
+		t.Fatalf("health %+v", health)
+	}
+	recovered, err := DecodeCredential(store.items["acc-1"])
+	if err != nil {
+		t.Fatal(err)
+	}
+	if recovered.AccountID != "acct_free" {
+		t.Fatalf("account id not persisted: %+v", recovered)
+	}
+}
+
 func TestDecodeCredentialNestedTokenData(t *testing.T) {
 	payload := []byte(`{"token_data":{"access_token":"at","refresh_token":"rt","account_id":"acct","email":"e@x","expired":"2027-01-01T00:00:00Z"}}`)
 	cred, err := DecodeCredential(payload)