GPT-5.6 Sol vs GPT-5.6 Terra
How far down the GPT-5.6 range you can go before it costs you.
Side by side
| Attribute | GPT-5.6 Sol | GPT-5.6 Terra |
|---|---|---|
| Input, per 1M tokens | $5.00 | $2.00 |
| Output, per 1M tokens | $30.00 | $12.00 |
| Context window | 1,050,000 | 1,050,000 |
| Provider | OpenAI | OpenAI |
| Tokenizer | o200k_base | o200k_base |
| Long-context tier | above 272,000 | above 272,000 |
| Retires | no date announced | no date announced |
Which to choose
- Reading more than you write
- GPT-5.6 Terra $2 against GPT-5.6 Sol $5 per million input tokens — a material gap of 2.5x.
- Past the long-context threshold
- GPT-5.6 Sol above 272,000, GPT-5.6 Terra above 272,000 bills the whole request higher — $4 and $10. GPT-5.6 Terra stays ahead either side of that line.
- 10,000 in, 1,000 out
- $0.0800 on GPT-5.6 Sol, $0.0320 on GPT-5.6 Terra. Over 10,000 such calls that is $480.00 in GPT-5.6 Terra's favour.
What this page does not tell you. Which model produces better answers. That depends on your task, and this site has no benchmark data — everything above is drawn from published pricing and specifications. Compare quality by running your own prompts through both.