In a blender or food processor, combine the tomatoes, cucumber, bell pepper, red onion, and garlic. Blend until the vegetables are finely chopped and well combined.
Tear the bread into small pieces and add them to the blender. Let the bread soak in the vegetable mixture for a few minutes to soften.
Add the olive oil, red wine vinegar, salt, and black pepper to the blender. Blend all the ingredients until smooth and well blended. If the gazpacho is too thick, you can add a little water to achieve the desired consistency.
Taste the gazpacho and adjust the seasoning if needed, adding more salt, vinegar, or pepper according to your preference.
Transfer the gazpacho to a large bowl or container and refrigerate for at least 1 hour to allow the flavors to develop and the soup to chill.
When ready to serve, give the gazpacho a good stir. Ladle the chilled soup into bowls or glasses. You can garnish it with diced cucumber, croutons or basil leaves for added texture and freshness. Enjoy!