GPT-6.1 Sol
OpenAI's efficiency model: near-Astra results at one-fifth of the token price.
Quick verdict
- Best for
- Developers moving production traffic off Astra to save cost
- Pricing
- $2 / $10 per million tokens; cached input $0.10
- Not ideal if
- Not available in the standard ChatGPT chat picker at launch — Work and Codex only
What is GPT-6.1 Sol?
GPT-6.1 Sol, announced at OpenAI DevDay on September 29, 2026, is positioned as the model most developers and ChatGPT Work users should run by default: OpenAI says it nearly matches GPT-6 Astra on coding, computer use, and professional tasks at $2 per million input tokens and $10 per million output, against Astra's $10 and $50. It is available in the API, Codex, and ChatGPT Work for Plus, Pro, Business, Enterprise, and Edu users, with an Ultrafast mode promised.
Key features
- One-fifth the token price of GPT-6 Astra
- Available in the API, Codex, and ChatGPT Work
- OpenAI reports improved factual accuracy and safety behaviour over GPT-6 Sol
- Ultrafast mode coming
- Powers the first-included Dot on Pro and Business Premium plans
Pros
- Brings GPT-6-class work down to the $2/$10 price tier
- Spares plan usage limits compared with Astra in ChatGPT Work
- Immediately available across OpenAI surfaces
Cons
- Not available in the standard ChatGPT chat picker at launch — Work and Codex only
- "Near-Astra" is OpenAI's claim; independent evaluations pending
- Arrived alongside a cut to the $200 Pro plan's allowance
Best for
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