Grok-4-Fast-Reasoning vs GPT-5.2-Codex
Grok-4-Fast-Reasoning is cheaper on output tokens, while Grok-4-Fast-Reasoning offers a larger context window. Choose Grok-4-Fast-Reasoning or GPT-5.2-Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Grok-4-Fast-Reasoning | GPT-5.2-Codex |
|---|---|---|
| Provider | Poe | Poe |
| Input / 1M tokens | $0.20 | $1.60 |
| Output / 1M tokens | $0.50 | $13.00 |
| Context window | 2M | 400K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Sep 2025 | Jan 2026 |
FAQ
Is Grok-4-Fast-Reasoning or GPT-5.2-Codex cheaper?
Grok-4-Fast-Reasoning is cheaper on output tokens ($0.50 vs $13.00 per 1M).
Which has the larger context window, Grok-4-Fast-Reasoning or GPT-5.2-Codex?
Grok-4-Fast-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.