grok-4.20-beta-0309-reasoning vs Fusion
Fusion is cheaper on output tokens, while grok-4.20-beta-0309-reasoning offers a larger context window. Choose grok-4.20-beta-0309-reasoning or Fusion based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | grok-4.20-beta-0309-reasoning | Fusion |
|---|---|---|
| Provider | 302.AI | OpenRouter |
| Input / 1M tokens | $2.00 | $-1,000,000.00 |
| Output / 1M tokens | $6.00 | $-1,000,000.00 |
| Context window | 2M | 1M |
| Parameters | — | — |
| Open weights | No | — |
| Released | Mar 2026 | — |
| LMArena (Chatbot Arena) Elo score | 1451 | — |
| LMArena WebDev Elo score | 1375 | — |
| LMArena Vision Elo score | 1263 | — |
FAQ
Is grok-4.20-beta-0309-reasoning or Fusion cheaper?
Fusion is cheaper on output tokens ($-1,000,000.00 vs $6.00 per 1M).
Which has the larger context window, grok-4.20-beta-0309-reasoning or Fusion?
grok-4.20-beta-0309-reasoning has the larger context window (2M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.