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OpenAI: GPT-5.6 Terra

by OpenAI

openai/gpt-5.6-terra
Unavailable

GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic...

Context

1.1Mtokens

About 1,500 pages of text at once

Max output

128Ktokens

About 183 pages in one answer

Intelligence

—

No score published for this model.

Output speed

78tokens/s

A 500-word answer in about 9 s

From public market statistics for this model

First token

2.0s

Reasoning models start later

From public market statistics for this model

Health, 30 days

50.00%

0 of 30 days without a fault

IranRouter’s measurements

Price & cost

Every rate in Rial. A request pays only for the tokens it actually uses.

Input5,471,931IRR / 1M tokens
Output32,831,586IRR / 1M tokens
Reasoning tokensThe output rate32,831,586IRR / 1M tokens
Cache read547,193IRR / 1M tokens
Cache write, 5 minutes6,839,914IRR / 1M tokens
Image input tokensThe input rate5,471,931IRR / 1M tokens
Per web search27,360IRR

Under these conditions, these rates replace the ones above:

Prompts over 272K tokens

Input10,943,862IRR / 1M tokens
Output49,247,379IRR / 1M tokens
Cache read1,094,386IRR / 1M tokens
Cache write, 5 minutes13,679,828IRR / 1M tokens

With prompt caching, the fixed part of your prompt is billed at the cache-read rate on later requests.

What would this model cost you a month?

Monthly cost

1.08BIRR

36.11M IRR a day, 18K IRR each request

30 days at today’s rate.

Rial price over 90 days

It moves with the exchange rate; the steps are the maker’s own price changes. Built at today’s margin, so approximate if the margin changed in the window.

InputOutput

Performance, 30 days

Health is measured by IranRouter itself: a day counts as healthy unless requests to this model failed on our side or it could not be served. First token and speed come from IranRouter’s traffic, and from public market statistics for this model on days without enough of it.

Daily health50.00%

Time to first token2.25 s

Output speed75 tokens/s

Place in the market

By usage across the global model market.

Daily rank

Share of the day’s tokens

Capabilities

Image inputYes
Audio inputNo
Tool callingYes
JSON outputYes
ReasoningReasoning levels: max, xhigh, high, medium, low, none
Web searchNo
Prompt cacheYes
Makes imagesNo
Open weightsNo
On the free planNo
Input
FileImageText
Output
Text

Parameters it accepts

include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetoolsverbosity

Other benchmarks

Coding index77
Agentic index43

Standard tests

  • GPQA DiamondScore: 88%Tasks: 396
  • τ-bench Verified AirlineScore: 72%Tasks: 100

Start in a minute

The official OpenAI and Anthropic SDKs; only the address and the key change.

Base URLhttps://iranrouter.com/v1
Model IDopenai/gpt-5.6-terra
API keyCreate one in the dashboard
# pip install openai
from openai import OpenAI

client = OpenAI(
    base_url="https://iranrouter.com/v1",
    api_key="ir-...",
)

r = client.chat.completions.create(
    model="openai/gpt-5.6-terra",
    messages=[{"role": "user", "content": "Hello, introduce yourself"}],
)
print(r.choices[0].message.content)
The full guide in the docs: keys, streaming and errors

Peer models

Its family and models with a close score; the last column compares one message’s cost with this model.

No peer models found.

Technical specs

ID
openai/gpt-5.6-terra
Maker
OpenAI
Tokenizer
GPT
Knowledge up to
February 2026
Released
Jul 9, 2026
Added to IranRouter
Aug 19, 2026
Context
1,050,000 tokens
Max output
128,000 tokens

Scores by Artificial Analysis, as of Oct 31, 2026

OpenAI: GPT-5.6 TerraOne message about 27,360 IRRStart with this model