From the source
OpenAI released GPT-6.1 Sol, an upgrade to GPT-6 Sol that delivers near-GPT-6 Astra performance on agentic coding, computer use, and professional workflows at one-fifth of Astra's standard input and output token prices.
- Cached input costs $0.10 per million tokens, 95% less than standard input and half the cached-input price of GPT-6 Sol.
- The model is available to Plus, Pro, Business, Enterprise and Edu users in ChatGPT Work and Codex, and via the API as gpt-6.1-sol at $2 per million input tokens, $0.10 per million cached input tokens, and $10 per million output tokens.