| GPT-5.6 Terra | GPT-6 Astra | |
|---|---|---|
| Input, per 1M tokens | $2.00 | $10.00 |
| Output, per 1M tokens | $12.00 | $50.00 |
| Context window | 1.05M | 1.05M |
| Classification or routing (600 tokens in, 10 out), per 1,000 | $1.32 | $6.50 |
| Chat reply (2,000 in, 400 out), per 1,000 | $8.80 | $40.00 |
| Retrieval-augmented answer (8,000 in, 500 out), per 1,000 | $22.00 | $105 |
| Confidence signal | no | no |
| Tool calling | yes | yes |
Which one should carry your traffic?
If GPT-5.6 Terra answers your requests as well as GPT-6 Astra, moving that traffic saves 78% on chat-shaped requests. Averages cannot tell you whether it does for your requests. GPT-5.6 Terra does not expose a confidence signal through OpenRouter, so Gimbix would test it as a full replacement rather than a first answer.
GPT-5.6 Terra profile · GPT-6 Astra profile · Measure it on your traffic