GPT-6.1 Sol: What It Is and How It Affects AI Search Visibility

GPT-6.1 Sol is OpenAI's paid-tier workhorse, documented as "near-Astra performance for complex work at a lower cost" and released on September 29, 2026 at OpenAI DevDay, a week after GPT-6 Sol. It reads text and images across a 1,050,000 token context window, costs $2 input and $10 output per million tokens against Astra's $10 and $50, and supports the web_search tool, which makes it the model behind a large share of paid ChatGPT, Codex and third-party answers.

GPT-6.1 Sol Key Facts

What GPT-6.1 Sol Is Used For

Sol is the name OpenAI gives the paid-tier model in each family, and 6.1 Sol is the current one. OpenAI's model documentation describes it as near-Astra performance for complex coding, computer use and professional work at a fifth of Astra's price, with a 500K token default context in Codex and ChatGPT Work and no long-context surcharge for subscription usage. Trade-press coverage of the DevDay launch on September 29, 2026 reports it as the model for Plus, Pro, Business and Enterprise plans; OpenAI's documentation does not itself state ChatGPT plan defaults, so treat the plan mapping as reported rather than vendor-confirmed.

Perplexity's plan table, a snapshot dated October 27, 2026, lists GPT-6.1 Sol for its Pro and Max subscribers, which is a second large surface where it answers research-style questions with citations. Between ChatGPT's paid plans and third-party pickers, 6.1 Sol is the GPT model most likely to be composing a professional buyer's comparison of your product.

Retrieval and Citation Behaviour

ChatGPT search is available on every plan, triggers automatically for queries that need current information, and uses third-party search providers including Microsoft, per OpenAI's search help article. On the API, GPT-6.1 Sol supports the web_search tool in the Responses API. In practice that makes Bing indexation the first gate: a page Bing cannot see is a page ChatGPT cannot retrieve.

Once retrieved, the model decides what to quote. Across the GPT-6 family I see the same pattern as with Claude: a handful of sources per answer, a strong preference for pages that state the answer plainly in the first screen, and a quiet penalty for pages whose facts disagree with the rest of the web. Model choice shifts how carefully that judgment is applied and how often the model bothers to search at all.

How to Be Visible When GPT-6.1 Sol Handles the Query

These are the actions justified by my ChatGPT SEO guide, weighted for a flagship model that reads deeply before citing.

• Allow the OpenAI crawlers and keep Bing healthy. Verify GPTBot, OAI-SearchBot and ChatGPT-User are not blocked by robots.txt or your CDN, and keep your Bing indexation clean; ChatGPT search leans on third-party search providers including Microsoft. The full walkthrough is in my ChatGPT SEO guide.
• Answer first under every heading. ChatGPT quotes the clearest source it retrieves, so a direct 40 to 60 word answer at the top of each section is the highest-leverage edit.
• Harden entity facts and brand mentions. Consistent name, category and claims across your site and the wider web; third-party brand mentions are the verification layer ChatGPT leans on.
• Write for verification. 6.1 Sol-class browsing means your claims get checked against the wider web mid-answer; specifics with dates and sources survive. The mention-building side is covered in how to get your brand mentioned by ChatGPT.
• Keep cornerstone pages current. Live retrieval favors maintained, dated, consistent pages.
• Hire it out if you want speed. The ChatGPT SEO expert service runs this playbook end to end.

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Anshul Rana

AI SEO, AEO & GEO Specialist · Top Rated Plus on Upwork

I am an AI SEO, AEO and GEO specialist with 8+ years of experience helping businesses get found on Google and AI platforms like ChatGPT, Gemini, Claude and Perplexity. Top Rated Plus on Upwork with a 100% Job Success Score and 1,000+ websites optimized, working with clients across the US, the UK, Australia and India. I run The Digital Geek for agency-level engagements.

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Sources

Every model fact on this page comes from OpenAI's own documentation and announcements, listed below and linked inline where each fact appears; where a fact comes from trade-press reporting instead, the text says so.

1. OpenAI: GPT-6.1 Sol model documentation
2. OpenAI: models overview
3. OpenAI: deprecations
4. OpenAI: ChatGPT search help article
5. Perplexity: models included in each subscription, snapshot of October 27, 2026