GPT-5.6 Terra API pricing — cost per million tokens
OpenAI's GPT-5.6 Terra costs $2 per million input tokens and $12 per million output tokens on the standard API tier (verified 2026-09-02). Note: Cut 20% from $2.50 / $15 on 2026-07-30. Compare it in the full pricing table or price your own prompts in the token cost calculator.
GPT-5.6 Terra price per million tokens
| direction | $ / Mtok | $ / 1K tokens |
|---|---|---|
| input (prompt) | $2 | $0.002 |
| output (completion) | $12 | $0.012 |
What real requests cost on GPT-5.6 Terra
| workload | input | output | total |
|---|---|---|---|
| Chat message (1K in / 500 out) | $0.002 | $0.006 | $0.008 |
| Long document (100K in / 2K out) | $0.20 | $0.024 | $0.22 |
| Agent session (500K in / 50K out) | $1.00 | $0.60 | $1.60 |
How GPT-5.6 Terra pricing compares
On the same chat-message workload, GPT-5.6 Terra costs 10× more than GPT-5.6 Luna (the cheapest tracked model) — capability, latency and context limits are the other side of that trade. Output tokens dominate long generations: at $12/Mtok, a 50K-token agent transcript costs $0.60 in output alone. Official rate card: OpenAI pricing.
Related: GPT-5.6 Sol pricing · GPT-5.6 Luna pricing · GPT-5.5 pricing · release timeline
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