The Cheapest Realtime AI Option in 2026 Is Not Priced the Way Most Teams Think

Based on the public pricing sheets checked on March 15, 2026 in our broader AI token pricing comparison, the short answer is straightforward: xAI’s per-minute realtime row is the cheapest clear headline, but it is not directly comparable to token-priced realtime models without usage assumptions.

That does not make this the universal best buy. It makes it the cleanest answer to one narrow question: how to think about the cheapest realtime option without comparing incompatible units. That distinction matters because a lot of teams still confuse the cheapest model row with the cheapest production stack.

The short answer

xAI Realtime is listed at $0.05 per minute, or $3 per hour. OpenAI publishes separate text and audio token rates for realtime models. That means the cheapest headline in realtime is often the easiest one to misread.

You cannot compare per-minute and per-token systems honestly without a usage model. How much audio goes in, how much text comes out, and how long the session stays open all matter.

The pricing rows that matter

Realtime option	Public unit	Notes
xAI Realtime API	$0.05 per minute	Also shown as $3 per hour.
OpenAI gpt-realtime-mini	Token-based	Separate text, audio, and image rates.
OpenAI gpt-realtime-1.5	Token-based	Much higher premium realtime tier.

This is why realtime pricing needs a workload model, not just a glance at the top line. A per-minute row can look absurdly cheap until your product shape makes token-heavy alternatives more efficient, or vice versa.

Why the headline can mislead

Cheap realtime pricing also says nothing about interruption handling, voice quality, latency, or multimodal depth. Those product qualities can justify paying more.

So the most useful question is not “who is cheapest?” but “who is cheapest for my session shape?”

When this is the right pick

• you are designing voice or realtime experiences now
• you want to normalize usage before picking a provider
• you need a reality check on simple per-minute headlines

When to ignore the headline

• you compare per-minute and per-token rows as if they were the same product
• you ignore session shape
• you treat price as a substitute for realtime UX quality

Bottom line

Realtime pricing is a unit problem before it is a vendor problem. xAI has the cheapest clear headline, but the honest winner depends on how your sessions actually behave.

If you want the wider market context, start with the full provider-by-provider pricing breakdown and, for media-specific workloads, the separate image and video generation API comparison.