GPT-6.1 Sol vs. GPT-6 Astra: Same accuracy at 18% of the cost
OpenAI launched GPT-6.1 Sol on September 29, just a week after it launched GPT-6 Sol. OpenAI marketed 6.1 as an The post GPT-6.1 Sol vs. GPT-6 Astra: Same accuracy at 18% of the cost appeared first on The New Stack.

The article compares OpenAI's GPT-6.1 Sol and GPT-6 Astra models, highlighting their similar accuracy at a significantly lower cost.
What happened
OpenAI released GPT-6.1 Sol as an upgrade to GPT-6 Sol, positioning it as a more affordable option with similar accuracy to GPT-6 Astra. The article presents test results comparing the two models across three tasks, showing GPT-6.1 Sol's performance and cost advantages.
Why it matters
For businesses and developers using AI models, the cost-effectiveness of GPT-6.1 Sol could lead to significant savings without compromising on accuracy, making it a compelling choice for AI-driven tasks.
- GPT-6.1 Sol provides similar accuracy to GPT-6 Astra at a significantly lower cost.
- Testing confirmed that GPT-6.1 Sol is faster and cheaper across multiple tasks.
- Businesses may benefit from adopting GPT-6.1 Sol for cost savings without sacrificing performance.
The bigger picture
The article suggests that GPT-6.1 Sol offers a cost-effective alternative to GPT-6 Astra, which could influence business decisions and resource allocation in AI projects.
The article concludes that GPT-6.1 Sol matches GPT-6 Astra's accuracy at a fraction of the cost, making it a viable and more economical choice for AI applications.
Technical details
- GPT-6.1 Sol and GPT-6 Astra are large language models with similar accuracy.
- Testing involved three tasks: CI triage, incident logs, and resolver spec.
- Costs are measured in per million input/output tokens and cached input pricing.
- Performance metrics include run time, token usage, and cost per run.
FAQ
What is GPT-6.1 Sol?
GPT-6.1 Sol is an AI model released by OpenAI, marketed as a cheaper alternative to GPT-6 Astra with similar accuracy.
How does GPT-6.1 Sol compare to GPT-6 Astra in terms of cost?
GPT-6.1 Sol costs 18% of what GPT-6 Astra does, with lower input, output, and cached input pricing.
What tests were conducted to compare the models?
The models were tested on three tasks: CI triage, incident logs, and resolver spec, with results showing GPT-6.1 Sol's performance and cost advantages.
This summary and analysis were generated with AI from the original article and may contain errors. Read the original for the full story.
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Originally published by The New Stack - AI on Oct 7, 2026.
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