OpenAI has released GPT-6.1 Sol, an upgrade to its mid-tier GPT-6 model, offering agentic coding, computer use, and professional work capabilities at approximately one-fifth of GPT-6 Astra's token price. The model is now live in the OpenAI API as `gpt-6.1-sol`, as well as in ChatGPT Work and Codex.

  • Pricing is set at $2 per million input tokens, $10 per million output tokens, and $0.10 for cached input, which is 50% lower than GPT-6 Sol's cached rate.
  • On DeepSWE v1.1, GPT-6.1 Sol matches GPT-6 Astra's performance while beating GPT-6 Sol by 6.4 percentage points at a lower reasoning effort.
  • It outperforms Claude Opus 5.5 on GDP.pdf and scores 2.2 points higher on AutomationBench 1.0.6, both at significantly reduced costs.
  • The model features a 1,050,000-token context window, 128,000 max output tokens, and supports five reasoning effort levels from low to max.
  • Factuality improves with the share of responses containing factual errors dropping from 11.4% to 7.7% at low effort.

OpenAI positions GPT-6.1 Sol as a cost-effective alternative for agents and developers requiring high-performance coding and tool-use capabilities without the premium price of the Astra tier.