Compare grok-4-1-fast-reasoning (X Ai) and grok-4-20-reasoning (X Ai) by price, context, capabilities, and latency.
Side by side
Compare price, provider, context, capabilities, latency, and source basis.
| Model | Provider | Input | Output | Context | Capabilities | Best for | Latency | Status | Source |
|---|---|---|---|---|---|---|---|---|---|
| grok-4-1-fast-reasoningx-ai/grok-4.1-fast-reasoning | X Ai | $0.2 / 1M tokens | $0.5 / 1M tokens | 2M | Streaming | General chat via X Ai, API workloads | 1661-3916ms | Catalog | Platform curated |
| grok-4-20-reasoningx-ai/grok-4.20-reasoning | X Ai | $1.25 / 1M tokens | $2.50 / 1M tokens | 256k | Streaming | General chat via X Ai, API workloads | 2338-4154ms | Catalog | Platform curated |
FAQ
grok-4-1-fast-reasoning is cheaper ($0.2 / 1M tokens input / $0.5 / 1M tokens output) vs grok-4-20-reasoning ($1.25 / 1M tokens input / $2.50 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.
grok-4-1-fast-reasoning is larger (2M tokens) vs 256k 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.