xAI: Grok 4.20 (0309) Reasoning

Where this model runs, and what each route costs. Requests are sent to a healthy provider automatically; if one errors, the gateway retries against another serving the same model.

What this model costs to run, next to the rate it is posted at. Caching and discounts mean the price actually paid is often below the listed one.

Long-context pricing. Once the prompt is larger than the threshold, the whole request is billed at these rates per 1M tokens; rates not listed keep the price above.From 200,000 tokens in the prompt: input $2.50 / output $5.00 / cache read $0.400.

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better). Throughput and TTFT are measured on streaming requests, which are the only ones with a first-token moment to time.

The share of requests to this model that completed successfully. When an upstream provider errors, the gateway retries against another provider serving the same model, so a single provider incident does not necessarily show up here.

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Token volume and request traffic to this model over time. Daily totals, UTC.

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