GPT-Realtime-2.1 vs GPT-5 Chat (latest)
GPT-5 Chat (latest) is cheaper on output tokens, while GPT-5 Chat (latest) offers a larger context window. Choose GPT-Realtime-2.1 or GPT-5 Chat (latest) based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT-Realtime-2.1 | GPT-5 Chat (latest) |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input / 1M tokens | $4.00 | $1.25 |
| Output / 1M tokens | $24.00 | $10.00 |
| Context window | 128K | 400K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Jul 2026 | Aug 2025 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.