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If you’re encountering an API key issue, start by clearing your browser’s cache. In Chrome, you can do this from the “History” section under “Clear browsing data.” Firefox and Safari have similar options under their settings. After doing that, try making the API request again. If the problem persists, go to the OpenAI website to ensure that the API key you are using is the same as the one shown in the error message.
OpenAI generally does not offer free API keys for their GPT-3 or GPT-3.5 Turbo models. Access to these APIs is usually provided through a paid subscription. OpenAI may offer free trials or special promotions at times, but these are typically time-limited and may have other restrictions.