Grok 4.20 Beta Reasoning (0309) (xAI) vs GLM-5.3 Flash (reka-ai)
GLM-5.3 Flash (reka-ai) is cheaper on output tokens, while Grok 4.20 Beta Reasoning (0309) (xAI) offers a larger context window. Choose Grok 4.20 Beta Reasoning (0309) (xAI) or GLM-5.3 Flash (reka-ai) based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Grok 4.20 Beta Reasoning (0309) (xAI) | GLM-5.3 Flash (reka-ai) |
|---|---|---|
| Provider | LLM Gateway | LLM Gateway |
| Input / 1M tokens | $2.00 | $0.15 |
| Output / 1M tokens | $6.00 | $0.50 |
| Context window | 2M | 262K |
| Parameters | — | — |
| Open weights | No | Yes |
| Released | Mar 2026 | Aug 2026 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.