If you spend hours every day reading AI responses, listening is the obvious upgrade. But ChatGPT and Claude take very different approaches to text-to-speech — and both have surprising gaps.
Here's an honest comparison, and the one workaround that fixes both.
TL;DR
- ChatGPT has voice mode in its mobile app, but none on chatgpt.com
- Claude has no voice features at all — mobile or web
- CastReader (free Chrome extension) adds a 🔊 Listen button to every response on both, plus Gemini, DeepSeek, Kimi, and Doubao
If you do most of your AI work in a browser, the comparison is short: neither ChatGPT nor Claude reads responses to you on the web. CastReader is the only option.
ChatGPT's Voice Setup
OpenAI's voice features live almost entirely in the ChatGPT mobile app:
- Standard voice mode (free) — robotic-ish, available to free users
- Advanced Voice Mode (ChatGPT Plus, $20/mo) — natural, conversational
- Read Aloud — long-press a response on mobile to hear it read
On chatgpt.com in the browser, you get... nothing. No listen button, no read-aloud, no voice mode. If you're doing serious work on a desktop — coding, writing, research — ChatGPT has no answer for "I want to hear this without copying it somewhere."
Claude's Voice Setup
Anthropic has built Claude around long, careful written responses. There is no voice feature in claude.ai or in the Claude mobile app, free or paid.
This is consistent with Claude's positioning — a writing and reasoning tool, not a conversational assistant. But it leaves a real gap for people who want to listen to Claude's longer answers while doing something else.
What's Missing from Both
Even on mobile, ChatGPT's voice mode has a fundamental limitation: it's a conversation mode, not a per-response reader. You can't ask three questions in text and then say "read me the second answer." You're stuck with whatever ChatGPT just said.
For research-style workflows — where you skim five answers, decide which one matters, and want to hear that one — neither platform helps.
How CastReader Fills the Gap
CastReader is a free Chrome extension that adds a 🔊 Listen button next to every individual AI response — on the web, in the browser where you actually work.
The key difference: per-response, not per-conversation
| Capability | ChatGPT Voice (Mobile) | Claude (Any) | CastReader (Web) |
|---|---|---|---|
| Works on chatgpt.com | ❌ | — | ✅ |
| Works on claude.ai | ❌ | ❌ | ✅ |
| Works on Gemini, DeepSeek, Kimi | ❌ | ❌ | ✅ |
| Listen to one specific response | ❌ | ❌ | ✅ |
| Skips thinking blocks/artifacts | — | — | ✅ |
| Skips code syntax | ❌ | — | ✅ |
| Cost | $20/mo for advanced | Free (no feature) | Free |
| Requires account | ✅ | — | ❌ |
How it actually works on each platform
On chatgpt.com: Ask GPT-4o anything. When the response renders, a small 🔊 button appears in the corner. Click it. Only that response is read aloud, in a natural Kokoro voice. Code blocks are skipped automatically.
On claude.ai: Same flow. Claude's thinking blocks and artifacts are excluded — you only hear the actual conversational reply. Switching speed (0.5x to 2x) is supported.
Auto language detection: If you ask Claude something in Chinese and it answers in Chinese, the voice switches automatically. Same for 40+ other languages.
Which One Should You Pick?
The honest answer:
- Want voice during a real conversation, on mobile? ChatGPT Plus's Advanced Voice Mode is excellent. It's a different product than text-to-speech.
- Want to read long Claude responses on a desktop while doing something else? Claude has nothing for you. Use CastReader.
- Want to listen to specific ChatGPT answers without switching to your phone? CastReader is the only option.
- Use multiple AI platforms? CastReader works on all six major ones with the same interaction.
Try It
CastReader installs in two clicks. The Listen button appears automatically the next time you open ChatGPT or Claude. No account, no API key, no usage limits.
FAQ
Does ChatGPT's web version have any voice features?
No. As of April 2026, chatgpt.com has no built-in text-to-speech. Voice features are limited to the iOS and Android apps.
Does Claude have any voice features?
No. Claude has no voice mode, no read-aloud, and no audio output of any kind — on web or mobile.
Is CastReader actually free?
Yes — no account, no API key, no usage limits. It's a Chrome/Edge extension powered by the open-source Kokoro TTS model running locally.
Does it work for languages other than English?
Yes. Auto language detection covers 40+ languages, including Chinese, Japanese, Korean, Spanish, French, German, and more. The voice matches the language of the response automatically.