GPT-5.6 Terra API price
On OpenCheap, GPT-5.6 Terra (OpenAI) costs $0.840 per 1M input tokens and $5.10 per 1M output tokens (cached input $0.210), through one OpenAI-compatible API.
Prices updated 2026-11-03 21:11 UTC.
Price per 1M tokens
| Input, our price | $0.840 |
|---|---|
| Output, our price | $5.10 |
| Cached input, our price | $0.210 |
| Prompts above 272K tokens, input · output | $1.70 · $7.70 |
| Context length | 1M tokens |
| OpenRouter list, input · output | $2.00 · $12.00 |
| vs list | −58% |
“vs list” compares our price with OpenRouter's list price on a 1:3 input:output blend, as on the Models page. Above a tier's prompt length, the whole request is priced at that tier's rates.
How to call GPT-5.6 Terra
Base URL https://api.opencheap.si/v1, model id opencheap/gpt-5.6-terra, and an API key from the console. Any OpenAI SDK works.
curl https://api.opencheap.si/v1/chat/completions \
-H "Authorization: Bearer $OPENCHEAP_API_KEY" -H "Content-Type: application/json" \
-d '{ "model": "opencheap/gpt-5.6-terra", "messages": [{ "role": "user", "content": "Hi" }] }'import os
from openai import OpenAI
client = OpenAI(base_url="https://api.opencheap.si/v1", api_key=os.environ["OPENCHEAP_API_KEY"])
r = client.chat.completions.create(model="opencheap/gpt-5.6-terra",
messages=[{"role": "user", "content": "Hi"}])
print(r.choices[0].message.content)FAQ
How much does the GPT-5.6 Terra API cost on OpenCheap?
On OpenCheap, GPT-5.6 Terra costs $0.840 per 1M input tokens and $5.10 per 1M output tokens, and cached input $0.210 per 1M tokens. Each request is routed to the cheapest healthy source for the model. You pay from one prepaid balance, with no monthly fee.
Is it OpenAI-compatible?
Yes. Point any OpenAI SDK or HTTP client at the base URL https://api.opencheap.si/v1 with an OpenCheap API key, and call /chat/completions with the model id opencheap/gpt-5.6-terra. Requests and responses have the same shape as OpenAI's chat completions, streaming included.
Does it work with Cursor, Claude Code or Codex?
Yes. In Cursor, add the custom model opencheap/gpt-5.6-terra with the base URL https://api.opencheap.si/v1. In Claude Code, set ANTHROPIC_BASE_URL to https://api.opencheap.si and ANTHROPIC_MODEL to opencheap/gpt-5.6-terra. In Codex, add OpenCheap as a model provider with base_url https://api.opencheap.si/v1. The quickstart has each setup step by step.