GPT-5.6 Terra vs GPT-5.3-Instant
GPT-5.6 Terra is cheaper on output tokens, while GPT-5.6 Terra offers a larger context window. Choose GPT-5.6 Terra or GPT-5.3-Instant based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT-5.6 Terra | GPT-5.3-Instant |
|---|---|---|
| Provider | OpenAI | Poe |
| Input / 1M tokens | $2.00 | $1.60 |
| Output / 1M tokens | $12.00 | $13.00 |
| Context window | 1.1M | 128K |
| Parameters | — | — |
| Open weights | — | No |
| Released | — | Mar 2026 |
| LMArena (Chatbot Arena) Elo score | 1447 | — |
| LMArena WebDev Elo score | 1522 | — |
| Epoch Capabilities Index score | 159 | — |
| LMArena Vision Elo score | 1271 | — |
| GPQA Diamond score | 93.3 | — |
| LiveBench score | — | 59.8 |
FAQ
Is GPT-5.6 Terra or GPT-5.3-Instant cheaper?
GPT-5.6 Terra is cheaper on output tokens ($12.00 vs $13.00 per 1M).
Which has the larger context window, GPT-5.6 Terra or GPT-5.3-Instant?
GPT-5.6 Terra has the larger context window (1.1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.