For years, Siri has been the default voice assistant for iPhone users behind the wheel, handling music playback, navigation, calls, and messages through Apple CarPlay. While Siri is reliable for basic commands, it often struggles with complex or open-ended questions—the kind that modern AI chatbots answer instantly. With Apple's recent CarPlay update allowing third-party voice assistants, drivers can now talk directly to ChatGPT or Perplexity AI without touching their phone. I spent several days testing both apps in my 2025 Toyota Camry to see which one truly enhances the driving experience.

Getting started with third-party CarPlay assistants

Before diving into the tests, there are a few requirements. You need an iPhone running iOS 26.4 or later, a CarPlay-compatible vehicle, and the latest versions of the ChatGPT and Perplexity apps. ChatGPT's CarPlay integration works with free accounts, but Perplexity's requires a Pro subscription ($20/month). Once connected, both apps appear as icons on the CarPlay dashboard. After tapping the icon, you start a voice session—ChatGPT shows a "New voice chat" button, while Perplexity prompts you to "Connect." The setup is straightforward, and within seconds, the assistant is ready to respond.

The key difference from Siri is that these AIs can hold natural, multi-turn conversations, answer complex questions, tell stories, and even quiz you. However, they also have limitations, especially with tasks that require access to personal data or device functions. I tested each assistant on 12 scenarios to compare their strengths and weaknesses.

1. Providing driving directions

I asked both assistants for driving directions to Faneuil Hall in Boston. ChatGPT could not access my location, so it couldn't provide directions. Perplexity, after requesting location permission, opened Apple Maps with the full route and turn-by-turn instructions. Perplexity wins this round.

2. Recommending local restaurants

Next, I requested a recommendation for a local Mexican restaurant. Again, ChatGPT was unable to see my location and could not help. Perplexity listed several nearby options, asked for my preference, and then launched Apple Maps directions to the chosen restaurant. Winner: Perplexity.

3. Playing music

I asked each assistant to play a specific song from Spotify. ChatGPT cannot play music from any service due to lack of access. Perplexity is designed to work with Apple Music and Spotify, but during the test, it launched the Spotify app on my iPhone without actually starting playback. I had to manually tap play, defeating the hands-free purpose. Winner: Neither.

4. Communicating with people

I attempted to place a phone call, send a text message, and compose an email using both AIs. Neither ChatGPT nor Perplexity could access my contacts or messaging apps. These tasks remain best handled by Siri. Winner: Neither.

5. Accessing my calendar

ChatGPT couldn't view my calendar at all. Perplexity, however, read out my upcoming appointments and even added a new event when I asked. Winner: Perplexity.

6. Setting a reminder

ChatGPT failed to set a reminder. Perplexity successfully created a reminder in the Reminders app. Winner: Perplexity.

7. Answering a general question

I asked both AIs to explain how the American Civil War started. Both provided accurate, concise summaries. The responses were comparable, so this is a tie.

8. Answering a specific question

I requested recommendations for great science-fiction novels from the 1960s. Both suggested four titles. Perplexity also added a few extra books, but ChatGPT's descriptions were more vivid and engaging. ChatGPT wins for personality.

9. Telling a story

I asked for a story about my cat Mr. Giggles landing on the moon. ChatGPT created a whimsical narrative with humor and imagination. Perplexity started by noting that cats can't actually go to the moon, then delivered a flat, factual account. ChatGPT clearly outperformed here.

10. Playing a game

I challenged both to a trivia quiz. Both delivered fun, interactive questions covering general knowledge and specific topics. The experience was equally enjoyable, so it's a tie.

11. Helping learn a language

With a trip to Italy planned, I asked for Italian language lessons. Both assistants asked what phrases I wanted to learn, then taught common words and corrected my pronunciation. Both were patient and encouraging. Another tie.

12. Chatting to pass the time

During a long drive, I said I was bored. ChatGPT engaged in a lively back-and-forth conversation, asking questions and building on my responses. Perplexity tended to recite information without much interaction, making it feel less like a companion. Winner: ChatGPT.

Overall performance and context

Perplexity's ability to access location, calendar, and reminders gives it a clear edge for utility tasks. But those are functions Siri already handles well. The real value of a third-party CarPlay AI lies in what Siri cannot do: answering complex questions, telling stories, teaching languages, and holding conversations. In those areas, ChatGPT consistently provided richer, more engaging interactions. Its narrative flair and conversational depth make it the better choice for solo drives when you want to be entertained or learn something new.

It's worth noting that both assistants have limitations. Neither can play music seamlessly or communicate directly with your contacts. And of course, they require an internet connection—so streaming through a cellular plan is essential. Additionally, Perplexity's requirement for a Pro subscription may deter some users, though free trials and promotions can mitigate that cost.

From a broader perspective, this CarPlay integration marks a significant shift in how we interact with in-car technology. Apple's decision to open up CarPlay to third-party voice assistants encourages competition and innovation. Google Gemini and Claude are also expected to join soon, giving users even more choices. For now, the best approach is to keep Siri for device-specific tasks and switch to ChatGPT for exploration and conversation.

Source:ZDNET News