GPT-4-Classic vs GPT-5.1
GPT-5.1 is cheaper on output tokens, while GPT-5.1 offers a larger context window. Choose GPT-4-Classic or GPT-5.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT-4-Classic | GPT-5.1 |
|---|---|---|
| Provider | Poe | Poe |
| Input / 1M tokens | $27.00 | $1.10 |
| Output / 1M tokens | $54.00 | $9.00 |
| Context window | 8K | 400K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Mar 2024 | Nov 2025 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.