Question 1

What is GPT-6.1 Sol?

Accepted Answer

GPT-6.1 Sol is OpenAI’s balanced GPT-6 model, announced on September 29, 2026 at DevDay. OpenAI describes it as near-Astra performance for complex work at a lower cost, aimed at coding, computer use and professional work.

Question 2

How do I use GPT 6.1 Sol on Runable?

Accepted Answer

Sign in to Runable, start a new task and choose GPT 6.1 Sol in the model menu next to the prompt box. Describe what you need and Runable runs it on GPT-6.1 Sol.

Question 3

GPT 6.1 Sol vs GPT Astra: which should I use?

Accepted Answer

OpenAI’s advice is to use Astra when quality matters most and 6.1 Sol for complex work you run often. 6.1 Sol trails Astra by about two points on OSWorld 2.0 at about one-fifth of the API token price.

Question 4

GPT 6.1 Sol vs GPT 6 Sol: what changed?

Accepted Answer

GPT-6.1 Sol scores higher across OpenAI’s tests, such as 75.2% vs 68.8% on DeepSWE 1.1 and 57.0% vs 27.6% on Terminal-Bench Science, and halves the cached input price. It is slower, at about 55 tokens per second against 104 for GPT-6 Sol in Artificial Analysis testing.

Question 5

GPT 6.1 Sol vs Sonnet 5.5: which is better?

Accepted Answer

Both cost $2 input and $10 output per million tokens on their makers’ APIs. In October 2026 Artificial Analysis scored Sonnet 5.5 at 56 and GPT-6.1 Sol at 52, and measured Sonnet as faster, while GPT-6.1 Sol cost less per task in their runs. Try both on the same task on Runable.

Question 6

Do I need ChatGPT or an OpenAI API key?

Accepted Answer

No. GPT 6.1 Sol runs on your Runable plan and credits, so you do not need a ChatGPT subscription or an OpenAI API key.

Question 7

Is there a GPT-6.1 Astra?

Accepted Answer

No. GPT-6.1 Sol is the newest model in OpenAI’s GPT-6 line, and GPT-6 Astra remains OpenAI’s flagship.

Question 8

What is the context window of GPT-6.1 Sol?

Accepted Answer

About 1.05 million tokens, with up to 922K tokens of input and 128K tokens of output per response.

Model	Best for	Speed	API price in / out
GPT-6 Astra	Highest intelligence, computer use	57 tokens/s	$10 / $50
GPT-6.1 Sol	Near-Astra results at lower cost	55 tokens/s	$2 / $10
GPT-6 Sol	Fast coding and agent work	104 tokens/s	$2 / $10

GPT-6.1 Sol

Build with GPT 6.1 Sol

GPT 6.1 Sol on Runable

Serious work, weekly

Uses software well

Try it against Claude

How to use GPT 6.1 Sol on Runable

Select GPT 6.1 Sol

Describe the job

Edit and ship

One prompt, finished work

Why choose GPT 6.1 Sol

Near Astra, for less

A big coding upgrade

Science work

Astra-grade safeguards

Cheaper cache

Well priced

GPT 6.1 Sol specs

GPT-6 Astra vs 6.1 Sol vs 6 Sol

The only AI agent you need

GPT 6.1 Sol FAQs

More AI models on Runable

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