OpenAI Releases GPT-6.1 Sol at One-Fifth Astra Price

OpenAI has officially rolled out its newest hosted model, GPT-6.1 Sol, available starting today within the OpenAI API under the identifier gpt-6.1-sol. The model is also integrated into ChatGPT Work and Codex, bringing near-Astra coding and computer use capabilities at a significantly reduced price point.

This release establishes three distinct tiers within OpenAI's GPT-6 lineup. The premium tier, GPT-6 Astra, sits at the top, followed by the newly introduced mid-tier GPT-6.1 Sol, and the lightweight GPT-6 Luna designed for high-efficiency, low-cost operations.

According to verified first-party API list prices, GPT-6 Astra costs $10 for input, $50 for output, and $1 for cached input per million tokens. In comparison, GPT-6.1 Sol reduces costs to $2, $10, and $0.10, while the budget-friendly GPT-6 Luna drops down to $0.10, $0.50, and $0.01 respectively.

Stock photo for illustration only, not from the actual event

The cached pricing structure plays a critical role for AI agents, which repeatedly resend the same system prompts, tool schemas, and history logs across execution steps. Cached reads for GPT-6.1 Sol now cost only 5% of the uncached input rate, improving upon the 10% rate seen previously and optimizing long-running agent workflows.