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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 4.1 Fast is 93% cheaper than xAI: Grok 4
Price (lower is better), Speed/Latency (lower is better), Performance (higher is better)
xAI: Grok 4.1 Fast is 1400% cheaper
| Spec | xAI: Grok 4 | xAI: Grok 4.1 Fast |
|---|---|---|
| Provider | x-ai | x-ai |
| Input price / 1M tokens | $3.00 | $0.20 |
| Output price / 1M tokens | $15.00 | $0.50 |
| Context window | 256k tokens | 2000k tokens |
| Latency (p50) | — | — |
| Best benchmark score | — | — |
| Open source | No | No |
Grok 4 is xAI's latest reasoning model with a 256k context window. It supports parallel tool calling, structured outputs, and both image and text inputs. Note that reasoning is not...
Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window. Reasoning can be enabled/disabled using...
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