diff --git a/cmd/launch/codex.go b/cmd/launch/codex.go
index d7d8d7062..4ac24deb9 100644
--- a/cmd/launch/codex.go
+++ b/cmd/launch/codex.go
@@ -19,7 +19,7 @@ func (c *Codex) String() string { return "Codex" }
 const codexProfileName = "ollama-launch"
 
 func (c *Codex) args(model string, extra []string) []string {
-	args := []string{"--oss", "--profile", codexProfileName}
+	args := []string{"--profile", codexProfileName}
 	if model != "" {
 		args = append(args, "-m", model)
 	}
@@ -63,40 +63,59 @@ func ensureCodexConfig() error {
 	return writeCodexProfile(configPath)
 }
 
-// writeCodexProfile ensures ~/.codex/config.toml has a [profiles.ollama-launch] section
-// with the correct openai_base_url.
+// writeCodexProfile ensures ~/.codex/config.toml has the ollama-launch profile
+// and model provider sections with the correct base URL.
 func writeCodexProfile(configPath string) error {
 	baseURL := envconfig.Host().String() + "/v1/"
 
-	header := fmt.Sprintf("[profiles.%s]", codexProfileName)
-	profileLines := []string{
-		header,
-		fmt.Sprintf("openai_base_url = %q", baseURL),
+	sections := []struct {
+		header string
+		lines  []string
+	}{
+		{
+			header: fmt.Sprintf("[profiles.%s]", codexProfileName),
+			lines: []string{
+				fmt.Sprintf("openai_base_url = %q", baseURL),
+				`forced_login_method = "api"`,
+				fmt.Sprintf("model_provider = %q", codexProfileName),
+			},
+		},
+		{
+			header: fmt.Sprintf("[model_providers.%s]", codexProfileName),
+			lines: []string{
+				`name = "Ollama"`,
+				fmt.Sprintf("base_url = %q", baseURL),
+			},
+		},
 	}
-	profileBlock := strings.Join(profileLines, "\n") + "\n"
 
 	content, readErr := os.ReadFile(configPath)
-	if readErr != nil {
-		// File doesn't exist; create with just the profile.
-		return os.WriteFile(configPath, []byte(profileBlock), 0o644)
+	text := ""
+	if readErr == nil {
+		text = string(content)
 	}
 
-	text := string(content)
+	for _, s := range sections {
+		block := strings.Join(append([]string{s.header}, s.lines...), "\n") + "\n"
 
-	if idx := strings.Index(text, header); idx >= 0 {
-		// Replace the existing profile section up to the next section header.
-		rest := text[idx+len(header):]
-		if endIdx := strings.Index(rest, "\n["); endIdx >= 0 {
-			text = text[:idx] + profileBlock + rest[endIdx+1:]
+		if idx := strings.Index(text, s.header); idx >= 0 {
+			// Replace the existing section up to the next section header.
+			rest := text[idx+len(s.header):]
+			if endIdx := strings.Index(rest, "\n["); endIdx >= 0 {
+				text = text[:idx] + block + rest[endIdx+1:]
+			} else {
+				text = text[:idx] + block
+			}
 		} else {
-			text = text[:idx] + profileBlock
+			// Append the section.
+			if text != "" && !strings.HasSuffix(text, "\n") {
+				text += "\n"
+			}
+			if text != "" {
+				text += "\n"
+			}
+			text += block
 		}
-	} else {
-		// Append the profile section.
-		if !strings.HasSuffix(text, "\n") {
-			text += "\n"
-		}
-		text += "\n" + profileBlock
 	}
 
 	return os.WriteFile(configPath, []byte(text), 0o644)
diff --git a/cmd/launch/codex_test.go b/cmd/launch/codex_test.go
index 36f3de11b..c19e24d1e 100644
--- a/cmd/launch/codex_test.go
+++ b/cmd/launch/codex_test.go
@@ -17,10 +17,10 @@ func TestCodexArgs(t *testing.T) {
 		args  []string
 		want  []string
 	}{
-		{"with model", "llama3.2", nil, []string{"--oss", "--profile", "ollama-launch", "-m", "llama3.2"}},
-		{"empty model", "", nil, []string{"--oss", "--profile", "ollama-launch"}},
-		{"with model and extra args", "qwen3.5", []string{"-p", "myprofile"}, []string{"--oss", "--profile", "ollama-launch", "-m", "qwen3.5", "-p", "myprofile"}},
-		{"with sandbox flag", "llama3.2", []string{"--sandbox", "workspace-write"}, []string{"--oss", "--profile", "ollama-launch", "-m", "llama3.2", "--sandbox", "workspace-write"}},
+		{"with model", "llama3.2", nil, []string{"--profile", "ollama-launch", "-m", "llama3.2"}},
+		{"empty model", "", nil, []string{"--profile", "ollama-launch"}},
+		{"with model and extra args", "qwen3.5", []string{"-p", "myprofile"}, []string{"--profile", "ollama-launch", "-m", "qwen3.5", "-p", "myprofile"}},
+		{"with sandbox flag", "llama3.2", []string{"--sandbox", "workspace-write"}, []string{"--profile", "ollama-launch", "-m", "llama3.2", "--sandbox", "workspace-write"}},
 	}
 
 	for _, tt := range tests {
@@ -57,6 +57,18 @@ func TestWriteCodexProfile(t *testing.T) {
 		if !strings.Contains(content, "/v1/") {
 			t.Error("missing /v1/ suffix in base URL")
 		}
+		if !strings.Contains(content, `forced_login_method = "api"`) {
+			t.Error("missing forced_login_method key")
+		}
+		if !strings.Contains(content, `model_provider = "ollama-launch"`) {
+			t.Error("missing model_provider key")
+		}
+		if !strings.Contains(content, "[model_providers.ollama-launch]") {
+			t.Error("missing [model_providers.ollama-launch] section")
+		}
+		if !strings.Contains(content, `name = "Ollama"`) {
+			t.Error("missing model provider name")
+		}
 	})
 
 	t.Run("appends profile to existing file without profile", func(t *testing.T) {
@@ -83,7 +95,7 @@ func TestWriteCodexProfile(t *testing.T) {
 	t.Run("replaces existing profile section", func(t *testing.T) {
 		tmpDir := t.TempDir()
 		configPath := filepath.Join(tmpDir, "config.toml")
-		existing := "[profiles.ollama-launch]\nopenai_base_url = \"http://old:1234/v1/\"\n"
+		existing := "[profiles.ollama-launch]\nopenai_base_url = \"http://old:1234/v1/\"\n\n[model_providers.ollama-launch]\nname = \"Ollama\"\nbase_url = \"http://old:1234/v1/\"\n"
 		os.WriteFile(configPath, []byte(existing), 0o644)
 
 		if err := writeCodexProfile(configPath); err != nil {
@@ -99,6 +111,9 @@ func TestWriteCodexProfile(t *testing.T) {
 		if strings.Count(content, "[profiles.ollama-launch]") != 1 {
 			t.Errorf("expected exactly one [profiles.ollama-launch] section, got %d", strings.Count(content, "[profiles.ollama-launch]"))
 		}
+		if strings.Count(content, "[model_providers.ollama-launch]") != 1 {
+			t.Errorf("expected exactly one [model_providers.ollama-launch] section, got %d", strings.Count(content, "[model_providers.ollama-launch]"))
+		}
 	})
 
 	t.Run("replaces profile while preserving following sections", func(t *testing.T) {
@@ -207,5 +222,8 @@ func TestEnsureCodexConfig(t *testing.T) {
 		if strings.Count(content, "[profiles.ollama-launch]") != 1 {
 			t.Errorf("expected exactly one [profiles.ollama-launch] section after two calls, got %d", strings.Count(content, "[profiles.ollama-launch]"))
 		}
+		if strings.Count(content, "[model_providers.ollama-launch]") != 1 {
+			t.Errorf("expected exactly one [model_providers.ollama-launch] section after two calls, got %d", strings.Count(content, "[model_providers.ollama-launch]"))
+		}
 	})
 }
diff --git a/docs/integrations/codex.mdx b/docs/integrations/codex.mdx
index 7a79d39ab..3a746f8c6 100644
--- a/docs/integrations/codex.mdx
+++ b/docs/integrations/codex.mdx
@@ -29,10 +29,10 @@ ollama launch codex --config
 
 ### Manual setup
 
-To use `codex` with Ollama, use the `--oss` flag:
+To use `codex` with Ollama, use the `--profile` flag:
 
 ```
-codex --oss
+codex --profile ollama-launch
 ```
 
 ### Changing Models
@@ -40,13 +40,13 @@ codex --oss
 By default, codex will use the local `gpt-oss:20b` model. However, you can specify a different model with the `-m` flag:
 
 ```
-codex --oss -m gpt-oss:120b
+codex --profile ollama-launch -m gpt-oss:120b
 ```
 
 ### Cloud Models
 
 ```
-codex --oss -m gpt-oss:120b-cloud
+codex --profile ollama-launch -m gpt-oss:120b-cloud
 ```