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GPT-6.1 Sol: Near-Astra AI Chat Intelligence

GPT-6.1 Sol is a major upgrade to GPT-6 Sol, delivering near-Astra intelligence. It excels in agentic coding, professional workflows, and complex computer use. This model provides an outstanding new balance of high-level capability and affordability for important everyday work.

It operates at just one-fifth of GPT-6 Astra's standard token prices. Additionally, cached input costs are drastically reduced to $0.1 per million tokens, giving developers more room to run capable agents that reuse context across requests.

Specs of GPT-6.1 Sol

• Released: September 29, 2026
• Context window: 1,050,000 tokens
• Max output: 128K tokens
• Knowledge cutoff: April 30, 2026
• API pricing: $2 / 1M input tokens | $10 / 1M output tokens
• Input: Text and image
• Output: Text

Key Features of GPT-6.1 Sol

Coding

On DeepSWE, GPT-6.1 Sol matches the performance of GPT-6 Astra at about one-fifth of the cost. It significantly eclipses GPT-6 Sol’s best score by 6.4% points, doing so at a lower reasoning effort and cost.

Professional Work

GPT-6.1 Sol handles complex PDFs and business workflows with ease, scoring higher on GDP.pdf than Claude Opus 5.5 at less than half the cost. On AutomationBench, it scores 2.2% points above Opus 5.5 at a medium reasoning effort for about a third of the cost.

Computer Use

GPT-6.1 Sol outperforms GPT-6 Sol on the demanding OSWorld 2.0 offline set by 7 percentage points at maximum reasoning effort, for less than half the cost. It also trails Astra’s score by 2.1 percentage points at around one-seventh of the cost per task.

Scientific Research

Tested on Terminal-Bench Science 0.1, GPT-6.1 Sol more than doubles the score of GPT-6 Sol at maximum reasoning effort at under half the cost per task. Averaging $5.47 per task, it delivers strong scientific capability at over 75% lower cost than Claude Opus 5.5 or GPT-6 Astra.

Factuality

Factuality is improved on difficult prompts, reducing the share of factual errors by 32% compared to GPT-6 Sol at low reasoning effort. Its error rate remains within 1.9 percentage points of GPT-6 Astra across all tested reasoning settings, at less than one-fifth the cost per task.

Experience GPT-6.1 Sol on HIX AI

HIX AI chat has already integrated GPT-6.1 Sol, allowing you to use this powerful model instantly without dealing with complex API settings. You can seamlessly leverage its near-Astra intelligence and high-level reasoning capabilities directly from our platform.

What makes HIX AI even more powerful is the integration with Internet, News and Academic data connections. By connecting GPT-6.1 Sol to the latest, real-world materials from the web, our platform ensures that your outputs are highly accurate, relevant, and reliable.

As an ultimate agent workspace, HIX AI doesn’t just stop at GPT-6.1 Sol. You also gain access to a suite of other top-tier language models. Whether you need the unmatched intelligence of GPT-6 Astra or the specialized capabilities of Sol and Luna, HIX AI puts them all at your fingertips.

GPT-6.1 Sol vs Other OpenAI Models