Fresh Vegetarian Proteins: what Claude and GPT would buy

Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.

They disagree: Claude chooses Nasoya and GPT chooses House Foods

In Grocery & Gourmet Food, Claude and GPT choose the same brand in 42 of 101 categories.

Claude Opus 5.5 · October 27, 2026

Nasoya Organic Extra Firm Tofu (line)

Extra-firm tofu is the most versatile fresh vegetarian protein, and Nasoya's organic extra-firm line is widely stocked, consistent, and works for baking, stir-frying and scrambling.

Not for: People avoiding soy, and anyone who wants a chewy, meaty bite out of the package without pressing or marinating.

GPT 6.1 Sol · November 10, 2026

House Foods Premium Tofu Extra Firm

Versatile plant-based protein with a sturdy texture for stir-fries, baking, and grilling; readily takes on marinades and sauces.

Not for: People with soy allergies or those seeking ready-seasoned protein.

Claude also lists House Foods among the brands that matter.

Which one fits you

soy-free, meaty chew

Upton's Naturals Seitan (line)

Wheat-gluten seitan gives the chewiest, most meat-like texture with no soy needed.

Not for: Anyone with celiac disease or gluten sensitivity.

fermented, whole-bean protein

Lightlife Tempeh (line)

Tempeh keeps the whole soybean and adds fermentation, which gives a nuttier flavor and a firmer slice than tofu.

Not for: People who dislike earthy or slightly bitter flavors, and anyone avoiding soy.

Check before you buy

Allergen base. Tofu and most tempeh are soy-based. Seitan is wheat gluten. This is the main way to rule products out: celiac means no seitan, and a soy allergy means no tofu or standard tempeh.
Texture vs. use. For a chewy, meaty bite choose seitan, then tempeh, then extra-firm tofu. For soft or creamy uses choose silken tofu. Choosing the wrong texture for the dish matters more than the brand you buy.
Ingredient list. Plain versions should list only the base, water and a coagulant or culture. Seasoning should be optional. Short, unflavored products are more flexible and avoid high-sodium marinades.
Freshness. Check the use-by date. Once opened, use within a few days. Fresh proteins are perishable, and a sour smell or slime means the product has spoiled.

Where to find Nasoya Organic Extra Firm Tofu

ShopRite
Safeway
WebstaurantStore

Shops seen in search results on November 6, 2026. A shop missing here may sell it too. Nothing was checked by a person.

Brands that matter

Nasoya: Widely available tofu across all firmness grades, including organic options.
Lightlife: The most common tempeh brand in US grocery stores.
Upton's Naturals: A leading packaged seitan brand, with plain and seasoned versions.
Hodo: Premium, dense organic tofu with a noticeably richer texture.
House Foods: A Japanese-style tofu maker with a broad firmness range.

What to avoid

Heavily pre-marinated products if you want to control the sodium yourself
Packages that are swollen or have cloudy, sour-smelling liquid
Seitan for anyone gluten-free, even if it is labelled 'vegan'

Questions

Which has the most protein: tofu, tempeh or seitan?

Seitan is generally the most protein-dense, tempeh comes next, and tofu varies with firmness. Firmer tofu holds less water and so contains more protein.

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