GPT-6.1 Sol API

GPT-6.1 Sol is the GPT-6.1 model OpenAI positions just below GPT-6 Astra, for complex coding and professional work. It takes text and images, has a 1,050,000-token context window (up to 922,000 input tokens) and returns up to 128,000 tokens. You set the reasoning depth with reasoning_effort (default medium) and can force a JSON schema with response_format.

max_completion_tokens is enforced and includes reasoning tokens - with a very low cap you may get only reasoning and no visible answer.

Best for

• Large code changes and pull request reviews
• Long-context analysis of documents, contracts and reports
• Strict JSON output for automation
• Image tasks: screenshots, diagrams, charts

How to call it

OpenAI SDK with a different base URL:

from openai import OpenAI

client = OpenAI(base_url="https://jantaris.com/v1", api_key="sk-jt-...")
resp = client.chat.completions.create(
    model="gpt-6.1-sol",
    reasoning_effort="medium",
    messages=[{"role": "user", "content": "Find the bug in this function and propose a fix."}],
)
print(resp.choices[0].message.content)

FAQ

What is the GPT-6.1 Sol API price?

$2.70 / $13.50 per 1M tokens. Prompts over 272K uncached input tokens are billed at the higher long-context rate for the whole request.

How is it different from GPT-6 Sol?

It is the newer series. Jantaris has GPT-6 Sol and GPT-6 Astra side by side - run the same task on both and compare the output and cost in your dashboard.

Does it accept images?

Yes, as image_url parts in a message.

How to call GPT-6.1 Sol via API

from openai import OpenAI

client = OpenAI(base_url="https://jantaris.com/v1", api_key="sk-jt-...")
resp = client.chat.completions.create(
    model="gpt-6.1-sol",
    messages=[{"role": "user", "content": "Write a haiku about Baltic amber."}],
)
print(resp.choices[0].message.content)

curl https://jantaris.com/v1/chat/completions \
  -H "Authorization: Bearer $JANTARIS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gpt-6.1-sol", "messages": [{"role": "user", "content": "Write a haiku about Baltic amber."}]}'

import OpenAI from "openai";

const client = new OpenAI({ baseURL: "https://jantaris.com/v1", apiKey: process.env.JANTARIS_API_KEY });
const resp = await client.chat.completions.create({
  model: "gpt-6.1-sol",
  messages: [{ role: "user", content: "Write a haiku about Baltic amber." }],
});
console.log(resp.choices[0].message.content);