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Side-by-side comparison of API pricing, context window, latency, and benchmark performance. Data refreshed daily from provider APIs and ModelStop's own latency probes.
💰xAI: Grok 4 Fast is 90% cheaper than SpaceXAI: Grok 4.6
Price (lower is better), Speed/Latency (lower is better), Performance (higher is better)
xAI: Grok 4 Fast is 900% cheaper
| Spec | xAI: Grok 4 Fast | SpaceXAI: Grok 4.6 |
|---|---|---|
| Provider | x-ai | x-ai |
| Input price / 1M tokens | $0.20 | $2.00 |
| Output price / 1M tokens | $0.50 | $6.00 |
| Context window | 2000k tokens | 500k tokens |
| Latency (p50) | — | — |
| Best benchmark score | — | — |
| Open source | No | No |
Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model...
Grok 4.6 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM. It is succeeded by [Grok 4.7](/x-ai/grok-4.7).
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