Compare Grok 4.1 Fast Reasoning (X Ai) and Grok 4.20 NON Reasoning (X Ai) by price, context, capabilities, and latency.
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| Model | Provider | Input | Output | Context | Capabilities | Best for | Latency | Status | Source |
|---|---|---|---|---|---|---|---|---|---|
| Grok 4.1 Fast Reasoningx-ai/grok-4.1-fast-reasoning | X Ai | $0.029 / 1M tokens | $0.072 / 1M tokens | — | Streaming | General chat via X Ai, API workloads | 1000-3000ms | Catalog | Platform curated |
| Grok 4.20 NON Reasoningx-ai/grok-4.20-non-reasoning | X Ai | $0.181 / 1M tokens | $0.362 / 1M tokens | — | Streaming | General chat via X Ai, API workloads | 1000-3000ms | Catalog | Platform curated |
FAQ
Grok 4.1 Fast Reasoning is cheaper ($0.029 / 1M tokens input / $0.072 / 1M tokens output) vs Grok 4.20 NON Reasoning ($0.181 / 1M tokens input / $0.362 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.
Both offer the same context window: — tokens.
Both target High quality. Pick Grok 4.1 Fast Reasoning to optimize cost, or Grok 4.1 Fast Reasoning for the longer context window. Test both on real prompts before committing production traffic.