GPT-6.1 Sol: OpenAI’s Cost-Efficient Model

OpenAI introduced GPT-6.1 Sol on September 29, 2026, positioning it as a cost-efficient model designed for complex coding, professional workflows, and agentic tasks.

What Is GPT-6.1 Sol?

GPT-6.1 Sol is part of OpenAI's GPT-6.1 family, optimized for agentic coding, computer use, and professional workflows. It features a 1.05 million-token context window, a 128K maximum output, and supports text + image input, excluding audio/video. The model integrates with tools like web search, file search, Code Interpreter, hosted shell, computer use, MCP, and more. Its knowledge cutoff is April 30, 2026. OpenAI describes it as delivering near-Astra performance for complex work at a lower cost.

Pricing: Token-Based Costs (Standard Rates)

GPT-6.1 Sol uses a token-based pricing model at Standard rates for short-context requests (≤272K input tokens), compared to GPT-6 Astra: Input: $2 (vs. $10 for Astra) Cached input: $0.10 (vs. $1 for Astra) Cache writes: $2.50 (vs. $12.50 for Astra) Output: $10 (vs. $50 for Astra) For long-context requests (>272K input tokens), pricing increases: 2× input/cache rates and 1.5× output rates for the full request. For detailed pricing exceptions, verify OpenAI’s API pricing documentation.

Performance: Benchmarked Workloads

OpenAI reports near-Astra performance across evaluated agentic coding and professional-work benchmarks. For precise evaluations, refer to OpenAI’s model documentation.

Who Is This For?

• Software teams building coding agents

• Developers creating computer-use or tool-using agents

• Businesses and teams running cost-sensitive, high-volume professional or API workloads

• Developers building multi-step agents reliant on tool calls

Limitations and Considerations

• Cost savings depend on task complexity, token usage, interaction volume, and context length

• Fine-tuning is currently not supported

How to Access GPT-6.1 Sol

GPT-6.1 Sol is available via OpenAI’s API, ChatGPT Work, and Codex. Availability depends on plan and workspace rollout. For broader product availability, check OpenAI’s official documentation for eligibility and access details.

Why This Matters Now

GPT-6.1 Sol delivers near-Astra performance for agentic coding, computer use, and professional work at a fraction of the cost. Its token-based pricing gives teams a straightforward way to estimate model usage costs, addressing key challenges in scaling AI solutions. This makes advanced AI more accessible for developers, startups, and businesses, though actual affordability depends on workload specifics, token volume, and tool interactions.

Final Thoughts

GPT-6.1 Sol is a specialized tool for targeted use cases where cost efficiency and performance are critical. For the latest updates, refer to OpenAI’s official documentation.

Visit OpenAI’s GPT-6.1 Sol documentation and API pricing guide for detailed guidance.