OpenAI launches GPT-6.1 Sol with near-Astra performance at one-fifth the cost

OpenAI has introduced GPT-6.1 Sol, an upgraded version of GPT-6 Sol designed to deliver stronger performance across coding, professional work, computer use and scientific research at a lower cost. The company says GPT-6.1 Sol can approach the intelligence of its more capable GPT-6 Astra model on several tasks while costing about one-fifth as much. The new model is priced at $2 per million input tokens and $10 per million output tokens. Cached input costs just $0.10 per million tokens, which OpenAI says is 95% lower than standard input pricing and 50% lower than GPT-6 Sol's cached input price.For comparison, GPT-6 Astra costs $10 per million input tokens and $50 per million output tokens, while GPT-6 Luna is priced at $0.10 and $0.50 respectively.GPT-6.1 Sol offers stronger coding and professional workOpenAI says GPT-6.1 Sol matches GPT-6 Astra on the DeepSWE v1.1 software-engineering test at roughly one-fifth of the cost. It also improves on GPT-6 Sol's best score by 6.4 percentage points while using a lower reasoning effort. On GDP.pdf, which tests how well AI models answer questions based on complex professional documents, GPT-6.1 Sol scored higher than Opus 5.5 with fallbacks at less than half the cost per task. It also came close to GPT-6 Astra's performance at around one-fifth the cost.On AutomationBench, which tests multi-step business workflows, GPT-6.1 Sol scored 2.2 percentage points higher than Opus 5.5 at medium reasoning effort while costing about one-third as much.The model also improved on OSWorld 2.0, a benchmark for computer-use tasks. OpenAI says GPT-6.1 Sol scored seven percentage points higher than GPT-6 Sol at maximum reasoning effort and came within 2.1 points of GPT-6 Astra.For scientific research, GPT-6.1 Sol more than doubled GPT-6 Sol's score on Terminal-Bench Science 0.1 at maximum reasoning effort. Its average cost per task was $5.47, compared with $23.80 for GPT-6 Astra. OpenAI also reported a reduction in factual errors on difficult prompts, from 11.4% with GPT-6 Sol to 7.7% with GPT-6.1 Sol.GPT‑6.1 Sol pricing and availabilityGPT‑6.1 Sol is available starting today to all Plus, Pro, Business, Enterprise, and Edu users in ChatGPT Work and Codex. GPT‑6.1 Sol is not yet available in Chat. Developers can also access it through the OpenAI API as gpt-6.1-sol. Its standard API prices are $2 per million input tokens, $0.10 per million cached input tokens, and $10 per million output tokens.OpenAI said that it will offer GPT‑6.1 Sol Ultrafast⁠, with up to 8x faster token generation compared to its standard speed in Codex in the coming days.You use AI every day. Now get your AI Quotient. Take the AIQ test.