grok-4.20-beta-0309-reasoning vs grok-4-1-fast-reasoning
grok-4-1-fast-reasoning is cheaper on output tokens. Choose grok-4.20-beta-0309-reasoning or grok-4-1-fast-reasoning based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | grok-4.20-beta-0309-reasoning | grok-4-1-fast-reasoning |
|---|---|---|
| Provider | 302.AI | 302.AI |
| Input / 1M tokens | $2.00 | $0.20 |
| Output / 1M tokens | $6.00 | $0.50 |
| Context window | 2M | 2M |
| Parameters | — | — |
| Open weights | No | No |
| Released | Mar 2026 | Nov 2025 |
FAQ
Is grok-4.20-beta-0309-reasoning or grok-4-1-fast-reasoning cheaper?
grok-4-1-fast-reasoning is cheaper on output tokens ($0.50 vs $6.00 per 1M).
Which has the larger context window, grok-4.20-beta-0309-reasoning or grok-4-1-fast-reasoning?
Both models offer a similar context window.
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.