How do you set locale on ChatGPT?

Prompt language is the control. We maintain per-market prompt sets rather than pretending a parameter exists.

Do you translate prompts automatically?

Only if you ask. Machine-translated prompts measure a phrasing no local user would type, so we prefer native prompt sets.

ChatGPT locale variance tracking

chatgptlocale_varianceAnonymous

ChatGPT infers locale from the language of the prompt rather than a parameter, so measuring Japan means sending the Japanese prompt. We handle prompt-language sets as first-class configuration.

How it renders

Controlled by prompt language, reinforced by egress country.

Sampling

Each locale is its own sample set. A cross-market comparison at n=30 per market costs what it says on the tin, which is why we surface the arithmetic before you commit.

Gotcha

Setting a country header does nothing here. If your prompt list is English, you are measuring the English-language answer no matter where the request originates.

What the API returns

A single collection call against ChatGPT for the locale variance field, sampled n times and returned as one object per prompt.

{
  "engine": "chatgpt",
  "field": "locale_variance",
  "prompt": "best ai visibility tracking tool",
  "country": "GB",
  "language": "en",
  "n": 30,
  "locales": [
    {
      "country": "GB",
      "language": "en",
      "share": 0.34,
      "divergence": 0.02,
      "unique_domains": 4
    },
    {
      "country": "DE",
      "language": "de",
      "share": 0.19,
      "divergence": 0.15,
      "unique_domains": 11
    }
  ]
}

GET /v1/collect?engine=chatgpt&field=locale_variance

Response fields

Key	Type	Notes
country	string	ISO 3166-1 alpha-2 country of the egress used.
language	string	ISO 639-1 language the prompt was issued in.
share	float	Brand share within that locale.
divergence	float	Distance from the global mean for this prompt.
unique_domains	integer	Domains cited in this locale and nowhere else.

What it costs

Each locale multiplies the collection count. Two markets at n=30 is 60 credits per prompt.

See credit pricing →

ChatGPT locale variance FAQ

How do you set locale on ChatGPT?: Prompt language is the control. We maintain per-market prompt sets rather than pretending a parameter exists.
Do you translate prompts automatically?: Only if you ask. Machine-translated prompts measure a phrasing no local user would type, so we prefer native prompt sets.

Measure ChatGPT in the languages your client sells in

Send your markets and we'll build the per-language prompt sets with you.

Other ChatGPT data

Citations Brand mentions Sources Answer text Share of voice Sentiment Prompt volatility Position

Across every engine

Compare how locale variance behaves on every engine we track.

Locale variance across all engines →