OpenAI Frontier Available in FlowHunt

GPT-6.1 Sol

GPT-6.1 Sol is a Frontier-tier AI model developed by OpenAI and available through the API from September 2026. It is a proprietary closed-weight model. The 1.05M-token context window is large enough to hold entire codebases, lengthy technical documents, or extended agentic sessions without truncation.

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GPT-6.1 Sol supersedes GPT-6 Sol, which OpenAI introduced on September 22, 2026 as a highly capable, lower-cost alternative to GPT-6 Astra. OpenAI treats the GPT-6 Sol and Luna models as High capability in cybersecurity and in biological and chemical domains.
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Benchmarks

Each score appears once, with its rank among tracked models and who measured it.

Compared with Frontier peers on the same scale
  • GPT-6.1 Solthis model
  • Claude Opus 5.5this model leads on 1 of 4
  • Grok 4.7this model leads on 4 of 4
Verified independent evaluator, counted in the ranking
Overall

AA Intelligence Index

Independent composite of agent, coding, knowledge and science tests by Artificial Analysis (v4).

Source ↗

GPT-6.1 Sol 51.8 Claude Opus 5.5 57.6 Grok 4.7 46.4
#5of 45 Verified
Agents

Terminal-Bench 4.0

Multi-step professional tasks done by an agent in a command-line terminal.

Source ↗

GPT-6.1 Sol 56.1% Claude Opus 5.5 59.6% Grok 4.7 25.8%
#4of 36 Verified
Reasoning

Humanity's Last Exam

Expert-written questions across 100+ subjects, no tools.

Source ↗

GPT-6.1 Sol 52.9% Claude Opus 5.5 61.4% Grok 4.7 43.1%
#7of 44 Verified

ARC-AGI-2

Novel visual puzzles that cannot be memorised.

Source ↗

GPT-6.1 Sol 94.2% Claude Opus 5.5 93.3% Grok 4.7 61.4%
#2of 27 Verified

What to Use GPT-6.1 Sol For

Software Engineering

A frontier-tier option for coding assistants and agentic coding workflows, for teams that want OpenAI's GPT-6 family below the Astra tier.

Agentic Workflows

Use it as the working model inside agents that plan, call tools, and run multi-step tasks through the API.

Long-Document & Codebase Analysis

With a 1.05M-token context window, GPT-6.1 Sol can take in entire repositories, long contracts, or extensive working histories in a single prompt.

Strengths and limitations

Strengths

  • Frontier-tier capability from OpenAI's GPT-6 family
  • Successor to GPT-6 Sol, which OpenAI introduced as a lower-cost alternative to GPT-6 Astra
  • Very long documents and large codebases (1.05M context)

Limitations

  • Closed-weight, so it cannot be self-hosted or fine-tuned on private data

Use it in FlowHunt

Use GPT-6.1 Sol in any flow, next to your own tools and knowledge sources.

  1. 1Open a flow, or create one from a template
  2. 2Add an AI Agent or Generator component
  3. 3Pick GPT-6.1 Sol in the model selector

Related AI Models

About OpenAI San Francisco, CA · Founded 2015 · openai.com

OpenAI was founded in December 2015 as a nonprofit AI research laboratory by Sam Altman, Elon Musk, Greg Brockman, Ilya Sutskever, John Schulman, and Wojciech Zaremba, with the mission of developing artificial general intelligence (AGI) that benefits all of humanity. In 2019 it created a capped-profit subsidiary, OpenAI LP, to raise institutional capital and scale model training. The company is known for the GPT series of language models (GPT-1 through GPT-6.1), the DALL-E image generation series, Whisper speech recognition, and Sora video generation. OpenAI operates the ChatGPT consumer application, a developer API, and enterprise services through Microsoft Azure. As of 2026 it maintains a close strategic partnership with Microsoft, which is the company's largest investor and cloud provider.

openai.com ↗

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