OpenAI route
gpt-5.6-terra
GPT-5.6 Terra API access.
The balanced GPT-5.6 floor after the 30 July 2026 cut: $2 input and $12 output per 1M tokens, 258K input. Start here unless evaluation says you need Sol or Astra. See the GPT-5.6 Sol vs Terra vs Luna notes.
Input / 1M tokens
$2.00
Output / 1M tokens
$12.00
Cached input / 1M tokens
$0.16
Context window
258K
Provider
OpenAI
Workload calculator
Put the token rate into context.
These examples apply the published input and output rates directly. Actual cost follows the exact tokens your client sends and the model returns.
This route is the 49th cheapest of 63 comparable text models and cheaper than 13 on the same key. Its context window ranks 52nd of 63.
Short request
$0.032
10K input + 1K output
Agent turn
$0.32
100K input + 10K output
Exact token billing
No request minimum
One model ID change
OpenAI compatible
Cost neighbourhood
Nearby routes, same workload.
Every comparison uses the same 100K-input / 10K-output turn. Changing route is a one-line model ID edit.
Price does not measure task quality. For generation routes, see GPT Image 2.
First request
Route it in one call.
Use any OpenAI SDK or tool. Keep the request shape, point the base URL at RouterPlex, and set the model ID shown here.
Read the quickstartcurl https://api.routerplex.com/v1/chat/completions \-H "Authorization: Bearer $ROUTERPLEX_API_KEY" \-H "Content-Type: application/json" \-d '{"model": "gpt-5.6-terra","messages": [{"role": "user", "content": "Hello!"}]}'
Route notes
Questions before production traffic.
01How much does the GPT-5.6 Terra API cost?+
Through RouterPlex, GPT-5.6 Terra costs $2.00 per 1M input tokens and $12.00 per 1M output tokens — the vendor list price with 0% markup, billed per token from a prepaid balance you top up from $5. Cached input tokens are billed at $0.16 per 1M instead of the full input rate, which is most of the prompt on a repeated agent or coding loop.
02What does one GPT-5.6 Terra agent turn cost?+
A 100K-token input with a 10K-token reply costs about $0.32 on GPT-5.6 Terra. That makes it the 49th cheapest of 63 comparable text models on RouterPlex, roughly 29.6× the cost of the cheapest option (DeepSeek V4 Flash).
03What is a cheaper alternative to GPT-5.6 Terra?+
Gemini 4 Argon from Google is the closest cheaper model on RouterPlex — $0.30 per agent turn against $0.32 for GPT-5.6 Terra, at $2.00/1M input and $10.00/1M output. Both run on the same key and the same endpoint, so switching is a one-line model ID change.
04Is GPT-5.6 Terra cheaper than Qwen3.7 Max?+
Yes. Per agent turn, GPT-5.6 Terra costs about $0.32 against $0.33 for Qwen3.7 Max — 2% less.
05What is the context window of GPT-5.6 Terra?+
GPT-5.6 Terra supports a 258K token context window on RouterPlex, the 52nd largest of the 63 models that publish one.
06Can I use GPT-5.6 Terra with the OpenAI SDK?+
Yes. RouterPlex serves GPT-5.6 Terra through an OpenAI-compatible endpoint at https://api.routerplex.com/v1 — point any OpenAI SDK or tool at that base URL with your RouterPlex key and set model to "gpt-5.6-terra".
Provider family
More from OpenAI.
Deploy this route
Put GPT-5.6 Terra behind one key.
Top up from $5 with no subscription required.