GPT-6 Sol
One of the models in OpenAI's GPT-6 series, released alongside Luna. Built on the same Astra-derived architecture, it is positioned for practical deployment with an emphasis on low cost and low inference error rates.
Core Facts
The API model identifier for GPT-6 Astra is gpt-6-astra.
GPT-6.1 Sol places particular emphasis on three usage scenarios: coding, computer operation, and professional work.
GPT-6 Sol and GPT-6 Luna deliver strong performance at lower cost and have pushed the Pareto frontier on the OfficeQA Pro benchmark
Timeline (last 90 days)
Mouse-1 is reportedly 163 times cheaper and 65 times faster than GPT-6 Sol.
GPT-6 Sol achieves only 61.9% calibration accuracy on AdaExploreBench.
Vals AI measured Gemini 4 Argon as ranking second on CyberBench at 77.86%, closely following GPT-6 Sol's 77.98%.
Gemini 4 Argon and GPT-6 Sol tie on FrontierCode 1.1 and beat GPT-6.1 Sol, indicating that the gap in coding ability among current top models has narrowed to a very small range.
Gemini 4 Argon's score on FrontierCode 1.1 is on par with GPT-6 Sol.
The Plus tier ($20/month) is currently the lowest threshold at which GPT-6 Sol can be bought.
For programming, complex reasoning, and automated workflow scenarios, Plus is the only choice, and the combination of Sol plus Codex currently has no substitute.
Luna (Latin for "moon") and Sol (Latin for "sun") are the sub-model suffixes OpenAI enabled in the GPT-6 generation, using celestial metaphors to distinguish different compute configurations of the same generation of models.
When new models released by various labs in September replaced older models in the same product line, GPT-6 Luna fell 56%, GPT-6 Sol fell 50%, DeepSeek V4.1 Flash fell 20%, and Claude Opus 5.5 fell 20%, while the other six remained flat—none increased in price.
Microsoft reported that Decision-1 achieved the highest accuracy in a comparison across 36 benchmarks covering nearly 150,000 questions, and claimed its P50 latency is approximately 35 times faster than GPT-6 Sol.
40 more timeline events
All Facts (20)
The API model identifier for GPT-6 Astra is gpt-6-astra.
90%VerifiedGPT-6.1 Sol places particular emphasis on three usage scenarios: coding, computer operation, and professional work.
80%VerifiedGPT-6 Sol and GPT-6 Luna deliver strong performance at lower cost and have pushed the Pareto frontier on the OfficeQA Pro benchmark
75%VerifiedOpenAI officially stated that GPT-6 Sol and Luna share the same lineage as the previously released Astra series.
70%VerifiedGPT-6 Astra is an entirely new pre-trained model generation, not a minor version iteration.
65%Verified@ai-sdk/openai@3.0.121 was released as a patch version, with the core change being the addition of support for the GPT-6.1 Sol model.
90%VerifiedGPT-6 Sol and Anthropic's Opus 5.5 were released on the same day.
70%VerifiedDevin officially announced that the newly integrated GPT-5.6 Sol model is now live on both the Devin Desktop and Devin CLI platforms
65%Partially VerifiedGPT-4.1 Sol is smarter than GPT-4 Sol but noticeably slower in token generation speed.
75%UnverifiedThe new model simultaneously achieves higher quality and lower cost, breaking the traditional performance-cost trade-off.
70%Partially VerifiedMicrosoft reported that Decision-1 achieved the highest accuracy in a comparison across 36 benchmarks covering nearly 150,000 questions, and claimed its P50 latency is approximately 35 times faster than GPT-6 Sol.
65%Partially VerifiedThe Xbox research team used Decision-1 to categorize over 10,000 pieces of feedback, achieving performance comparable to GPT-6 Sol but more than 14 times faster and 200 times cheaper.
65%Partially VerifiedCompared to the previous generation, Sol's input and output prices both dropped by half, while Luna's input price dropped by half and its output price dropped by approximately 58%.
65%Partially VerifiedGPT-6 Sol's price dropped by half while its intelligence level remained almost on par with the previous generation.
65%UnverifiedIn Artificial Analysis evaluations, GPT-6 Sol costs approximately $0.25 per evaluation and Opus 5.5 approximately $1.34, making the per-evaluation cost of Opus about 5.4 times that of Sol.
60%UnverifiedIn the Automation Bench test, GPT-6 Sol's extra high tier achieved first place 33% of the time, while 5.6's max effort scored 28.8.
60%UnverifiedMouse-1 is reportedly 163 times cheaper and 65 times faster than GPT-6 Sol.
50%UnverifiedGPT-6 Sol achieves only 61.9% calibration accuracy on AdaExploreBench.
50%UnverifiedVals AI measured Gemini 4 Argon as ranking second on CyberBench at 77.86%, closely following GPT-6 Sol's 77.98%.
50%UnverifiedThe Plus tier ($20/month) is currently the lowest threshold at which GPT-6 Sol can be bought.
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