GPT-5.6 Sol Pro API

GPT-5.6 Sol Pro is OpenAI’s highest-capability GPT-5.6 option for difficult tasks and longer-running workflows.
Context
1.1M tokens
Input
$5.5016 / 1M
Output
$27.508 / 1M
Released
Jul 9, 2026

How to use GPT-5.6 Sol Pro API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to openai/gpt-5.6-sol-pro.
import requests

r = requests.post(
    "https://api.aimlapi.com/v1/chat/completions",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "openai/gpt-5.6-sol-pro",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ]
    },
)
print(r.json())
const r = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "openai/gpt-5.6-sol-pro",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }),
});
console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/chat/completions \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"openai/gpt-5.6-sol-pro","messages":[{"role":"user","content":"Hello!"}]}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.

GPT-5.6 Sol Pro API Pricing

TypePrice
Input
$5.5016 / 1M
Output
$27.508 / 1M
Cached input
$0.55016 / 1M

GPT-5.6 Sol Pro is not available on the Free plan, and GPT-5.6 Sol’s promotional pricing is available at least through November 21, 2026.

GPT-5.6 Sol Pro vs other models

ModelInputOutputContextBest for
$5.5016 / 1M
$27.508 / 1M
1.1M tokens
Agentic workflows and structured output
Free
Free
1M tokens
Coding + agentic reasoning
$0.82524 / 1M
$8.2524 / 1M
1.04M tokens
Reasoning + agents
$0.41262 / 1M
$3.4385 / 1M
1M tokens
Reasoning + agents

Start building with GPT-5.6 Sol Pro

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