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OpenAI

GPT-6 Sol

OpenAI's GPT-6 model between Luna and Astra, trained like Astra and able to reply with reasoning off.

Chat with GPT-6 Sol in Super AgentView pricing

What is GPT-6 Sol?

GPT-6 Sol is the middle model of OpenAI's GPT-6 series, released on September 22, 2026.

It sits below the flagship GPT-6 Astra and above GPT-6 Luna, and OpenAI trained it with methods similar to Astra's to bring Astra's gains in coding, computer use and professional work to a faster, cheaper model. OpenAI says it makes about half as many factual mistakes as its predecessor and gives clearer, slightly shorter answers. OpenAI's docs now point to GPT-6.1 Sol as the newer Sol model. In Super Agent it can reply with reasoning off or think up to max.

Provider
OpenAI
Context window
1.05M tokens
Input
Text, Image
Reasoning
Off to max
Max output
128K tokens
Knowledge cutoff
Apr 20, 2026
Released
Sep 22, 2026

How GPT-6 Sol performs

Published by OpenAI

Results OpenAI reported for GPT-6 Sol. Each lab runs its own setup, so compare these with other models only inside the same table.

Benchmark results OpenAI published for GPT-6 Sol
BenchmarkScoreSetting
Agents' Last Exam56.36%max effort
DeepSWE68.81%max effort
OSWorld 2.064.43%offline set, max effort
FrontierCode49.27%max effort
AutomationBench33.18%extra high effort
Factual error rate on difficult prompts (lower is better)4.52%extra high effort

Source: openai.com

What you can do with GPT-6 Sol

  • Middle tier of the GPT-6 series, between Luna and Astra

  • About half the factual mistakes of its predecessor, according to OpenAI

  • Clearer, less jargon-heavy answers carried over from Astra

  • Reasoning can be switched off for instant replies

  • 1.05M-token context that also takes images

How to prompt GPT-6 Sol

  • Use reasoning off for rewrites and brainstorming, and medium or higher for plans.
  • Describe the business goal along with the task so it can make sensible choices along the way.
  • If you need its newer sibling's accuracy, try the same prompt on GPT-6.1 Sol.

Where GPT-6 Sol fits best

  • Professional writing and planning

  • Agent tasks with several steps

  • Business workflows such as briefs, reports and content calendars

  • Quick answers with reasoning off

How GPT-6 Sol compares

GPT-6 Sol compared with other chat models on Flashloop
ModelLMArena textLMArena codingContext windowReasoning
GPT-6 Sol1459#621519#381.05M tokensOff to max
DeepSeek V4 Pro1458#641501#791M tokensOff, medium, high, extra high
Kimi K2.61461#591516#44256K tokensOn or off
Claude Sonnet 51462#581520#371M tokensOff to max
Grok 4.61456#661510#60500K tokensLow to extra high

Good to know before you start

  • OpenAI has released GPT-6.1 Sol as its upgrade
  • Below GPT-6 Astra on the hardest end-to-end work
  • Outputs text, so finished images and clips come from the generation model Super Agent calls

Start chatting with GPT-6 Sol

Chat with GPT-6 Sol in Super Agent

  1. Select GPT-6 Sol

    Open Super Agent on Flashloop and choose GPT-6 Sol in the model picker.

  2. Enter your prompt

    Ask for what you need: an answer, a plan, or the images and videos you want the agent to make.

  3. Send and keep going

    Send the message. GPT-6 Sol answers in Super Agent and runs any generations you asked for.

Questions about GPT-6 Sol

Where does GPT-6 Sol sit in the GPT-6 lineup?

Between GPT-6 Luna, the efficient low-cost tier, and GPT-6 Astra, OpenAI's flagship.

Should I use GPT-6 Sol or GPT-6.1 Sol?

GPT-6.1 Sol is OpenAI's upgrade, with higher coding and computer-use scores and fewer factual errors. GPT-6 Sol is still useful when you want to turn reasoning off, which GPT-6.1 Sol does not support.

What reasoning levels does GPT-6 Sol support?

Off, low, medium, high, extra high and max. Super Agent starts it at low.

What is GPT-6 Sol Pro?

GPT-6 Sol run in OpenAI's pro reasoning mode, which spends more work on each request. It sits directly under GPT-6 Sol in the model picker.

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