grok-4.20-beta-0309-reasoning vs GPT-6.1 Terra (US)
GPT-6.1 Terra (US) 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 GPT-6.1 Terra (US) based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | grok-4.20-beta-0309-reasoning | GPT-6.1 Terra (US) |
|---|---|---|
| Provider | 302.AI | Amazon Bedrock |
| Input / 1M tokens | $2.00 | $1.10 |
| Output / 1M tokens | $6.00 | $5.50 |
| Context window | 2M | 1.1M |
| Parameters | — | — |
| Open weights | No | No |
| Released | Mar 2026 | Oct 2026 |
| LMArena (Chatbot Arena) Elo score | 1451 | — |
| LMArena WebDev Elo score | 1376 | — |
| LMArena Vision Elo score | 1262 | — |
FAQ
Is grok-4.20-beta-0309-reasoning or GPT-6.1 Terra (US) cheaper?
GPT-6.1 Terra (US) is cheaper on output tokens ($5.50 vs $6.00 per 1M).
Which has the larger context window, grok-4.20-beta-0309-reasoning or GPT-6.1 Terra (US)?
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.