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)
Gemini 4 Argon's score on FrontierCode 1.1 is on par with GPT-6 Sol.
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.
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.
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.
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.
The 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.
Decision-1 has a calibration score of 92.2 (out of 100), is approximately 2.5 times faster than the second-ranked decision model, and approximately 35 times faster than GPT-6 Sol.
The claim that Decision-1 is 35 times faster than GPT-6 Sol is self-reported data from the vendor, lacking independent third-party benchmark evidence.
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%VerifiedGPT-5.6 Sol is an all-new flagship model focused on complex reasoning and agentic programming.
75%VerifiedGPT-4.1 Sol is now available in the ChatGPT Workbench and Codex for users from Plus to EDU tiers, but has not yet launched in the regular chat interface.
70%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%VerifiedGPT-5.6 Sol has the capability to handle long-cycle tasks running continuously for days, requiring only a given objective to iteratively produce detailed results, with significantly improved UI generation quality.
65%Verified@ai-sdk/[email protected] 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%VerifiedThe core foundation of this update is the new frontier model GPT-5.6 (codenamed Sol in the demo), which is open to all users.
75%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 VerifiedThe release interval between GPT-6 Sol and GPT-6.1 Sol was only one week.
75%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.
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