xAI API pricing — every model compared

Every xAI model with current API pricing, in dollars per million tokens. Verified against xAI's own documentation and dated.

All xAI models

The spread

Across xAI's current models, input pricing runs from $1.00 (Grok Build 0.1) to $2.00 (Grok 4.5) per million tokens — a 2× range.

That range is the whole reason model selection matters more than prompt golfing. Moving a workload down a tier, where quality allows, changes the bill by a multiple. Shortening a prompt changes it by a percentage.

Reading these numbers

• Output costs more than input on every model here — 2.0× to 3.0×. A workload that generates a lot is priced very differently from one that reads a lot.
• Cached input is the biggest discount available. If your prompts share a stable prefix, structuring for cache hits is worth more than any model change short of a tier drop.
• Token counts are not comparable across providers. Each tokenizes differently, so the same text is a different number of tokens on xAI than elsewhere. Cross-provider price comparisons carry a margin of error.

Getting your actual spend

These are list prices. For what you are really being billed, read xAI's billing API — a management key is what that takes.

Source

Verified against xAI's pricing documentation. Each model page carries its own verification date.