Pushing the frontier of cost-efficient intelligence
Grok 4 Fast is xAI's latest multimodal reasoning model, setting a new standard for cost-efficient intelligence. With a 2M token context window, it achieves a SOTA price-to-performance ratio. It's now available for free in the Grok app.
xAI's new Grok 4 Fast is built around a pretty compelling pitch.
It's fast (~190 tokens per second). It's cheap (API pricing is $0.20 / 1M input and $0.50 / 1M output tokens). And according to Artificial Analysis, this gives it a new SOTA price-to-intelligence ratio.
But the most important part is the accessibility. For a limited time, it's completely free for developers on platforms like OpenRouter. And it's also free for all users in the Grok app on web, iOS, and Android.
So, when a model is this fast, this cheap, and free for everyone to try right now... what's the reason not to?
About Grok 4 Fast on Product Hunt
“Pushing the frontier of cost-efficient intelligence”
Grok 4 Fast launched on Product Hunt on September 21st, 2025 and earned 356 upvotes and 11 comments, earning #2 Product of the Day. Grok 4 Fast is xAI's latest multimodal reasoning model, setting a new standard for cost-efficient intelligence. With a 2M token context window, it achieves a SOTA price-to-performance ratio. It's now available for free in the Grok app.
On the analytics side, Grok 4 Fast competes within Productivity, API and Artificial Intelligence — topics that collectively have 1.2M followers on Product Hunt. The dashboard above tracks how Grok 4 Fast performed against the three products that launched closest to it on the same day.
Who hunted Grok 4 Fast?
Grok 4 Fast was hunted by Zac Zuo. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Zac Zuo
Hi everyone!
xAI's new Grok 4 Fast is built around a pretty compelling pitch.
It's fast (~190 tokens per second). It's cheap (API pricing is $0.20 / 1M input and $0.50 / 1M output tokens). And according to Artificial Analysis, this gives it a new SOTA price-to-intelligence ratio.
But the most important part is the accessibility. For a limited time, it's completely free for developers on platforms like OpenRouter. And it's also free for all users in the Grok app on web, iOS, and Android.
So, when a model is this fast, this cheap, and free for everyone to try right now... what's the reason not to?