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OpenAI: GPT-5.6 Sol: AI model

GPT-5.6 Sol is the flagship of OpenAI's GPT-5.6 series from OpenAI with a 1.05M-token context window. Reachable from inside Iran through Hormouz.

Context window:
1,050,000 tokens
Input:
$2/1M tokens
Output:
$10/1M tokens
Type:
text, image
  • Vision
  • Tools
  • Streaming
  • Long context
Good for:Popular for Academia · #16Popular for Health · #18Ranks are based on global usage data

Thinking levels: max · xhigh · high · medium · low · none

GPT-5.6 Sol is the top model of OpenAI's GPT-5.6 series, built for complex reasoning, coding and agent workflows. It is particularly strong at command-line work, multi-step coding tasks and long problem solving. It has since been followed by the GPT-6 series, but remains a capable choice for these tasks.

It accepts text, image and file (PDF) input and returns text, and supports tool calling, structured JSON output and streaming. Reasoning can be switched on when a problem needs more thought and left off when speed matters. GPT-5.6 Sol is commonly used for complex reasoning, command-line and multi-step coding, agent workflows and long problem solving. Hormouz serves it behind an OpenAI-compatible API: point your base URL at Hormouz, drop in a Hormouz key, and existing OpenAI SDK code runs without changes.

Pricing is usage-based: $2 per million input tokens and $10 per million output tokens. There is no fixed monthly fee, and you pay only for the tokens you use. Hormouz provides stable access to the model from inside Iran, with no foreign credit card or circumvention tooling required.

GPT-5.6 Sol is the flagship model in OpenAI's GPT-5.6 series. It is suited for complex reasoning, coding, and agentic workflows, and is particularly strong at command-line and multi-step coding tasks...

Quickstart

curl https://api.hormouz.net/v1/chat/completions \
  -H "Authorization: Bearer ng-YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.6-sol",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Specs

VendorOpenAI
TypeText, Image
Context window1,050,000 tokens
Pricing$2.00/M in · $10.00/M out
APIChat Completions
CapabilitiesStreaming · Vision · Tools

Benchmarks

47
Intelligence Index
Better than 91% of models we compared
77.4
Coding Index
Better than 98% of models we compared
50.2
Agentic Index
Better than 92% of models we compared

Reasoning

GPQA Diamond
Graduate-level scientific reasoning
94.1%
HLE
Humanity's Last Exam
49.5%
IFBench
Instruction-following
72.7%
AA-LCR
Long-context reasoning
84%
CritPt
Research-level physics reasoning
32.3%
AA Omniscience
Broad factual knowledge accuracy
59.4%
Non-Hallucination
Rate of avoiding fabricated answers
7.8%

Coding

SciCode
Python for scientific computing
57.1%
Terminal-Bench Hard
Agentic coding & terminal use
65.9%

Agentic

τ²-Bench
Tool-use agents in dual-control scenarios
85.1%
GDPval
Economically valuable tasks
55.6%

Source: Artificial Analysis

Code example

cURL
curl https://api.hormouz.net/v1/chat/completions \
  -H "Authorization: Bearer ng-YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.6-sol",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'
Python
from openai import OpenAI
client = OpenAI(api_key="ng-YOUR_API_KEY", base_url="https://api.hormouz.net/v1")
response = client.chat.completions.create(
    model="openai/gpt-5.6-sol",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)
JavaScript
import OpenAI from "openai";
const client = new OpenAI({ apiKey: "ng-YOUR_API_KEY", baseURL: "https://api.hormouz.net/v1" });
const response = await client.chat.completions.create({
  model: "openai/gpt-5.6-sol",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);

Buy the OpenAI: GPT-5.6 Sol API, paid in rial

  • Buy credit with an Iranian bank card; no foreign card or account needed.
  • One Hormouz key reaches OpenAI: GPT-5.6 Sol and 600+ other models, and you pay only for what you use.
  • No VPN and no risk of a banned account; just change the base URL to api.hormouz.net/v1.
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FAQ

How much does GPT-5.6 Sol cost?
Pricing is usage-based: $2 per million input tokens and $10 per million output tokens. There is no fixed monthly fee, and you pay only for the tokens you use.
How do I access GPT-5.6 Sol from inside Iran?
Create an account on Hormouz and generate an API key. Hormouz provides a stable path to the model from inside Iran, with no foreign credit card or circumvention tooling required.
Is GPT-5.6 Sol compatible with OpenAI code?
Yes. Hormouz exposes an OpenAI-compatible API. Point your base URL at Hormouz and swap in your Hormouz key. Your existing SDKs and code run without a rewrite.
What context window and capabilities does GPT-5.6 Sol have?
It has a 1.05M-token context window, accepts text, image and file (PDF) input, and supports tool calling, structured JSON output and streaming. Reasoning can be switched on when a problem needs more thought and left off when speed matters.
What is GPT-5.6 Sol good for?
Typical uses are complex reasoning, command-line and multi-step coding, agent workflows and long problem solving.

Updated 2026-10-13