--- title: "GPT-6.1 family — distinct SKUs · Undominated.ai" canonical: https://undominated.ai/families/gpt-6-1/ description: "Sol is the GPT-6.1 model OpenAI documents. Its Pro-labelled catalogue row is retained separately and is not asserted to be a direct API model ID: OpenAI documents no gpt-6.1-sol-pro model." --- # GPT-6.1 family — distinct SKUs · Undominated.ai > Sol is the GPT-6.1 model OpenAI documents. Its Pro-labelled catalogue row is retained separately and is not asserted to be a direct API model ID: OpenAI documents no gpt-6.1-sol-pro model. OpenAI / generation # GPT-6.1 family Sol is the GPT-6.1 model OpenAI documents. Its Pro-labelled catalogue row is retained separately and is not asserted to be a direct API model ID: OpenAI documents no gpt-6.1-sol-pro model. Family research reviewed 2026-09-30 · Official source notes below Standard models 2 Independently rated 1 / 2 Known token rates 2 / 2 Global balanced frontier 0 [Compare the members ↓](#members)[Read source notes](#source-notes)[All families](https://undominated.ai/families/) [Compare models](https://undominated.ai/compare/) Comparison context Choose up to three standard models in Compare. Requirements and prompt length apply in Compare. This page keeps its stated price basis and workload controls. ## Before you choose ### Direct API identity OpenAI documents GPT-6.1 Sol under the model ID gpt-6.1-sol, with Batch as a supported endpoint. It documents no gpt-6.1-sol-pro model, so the Pro-labelled marketplace row is kept separate and is not asserted to be a direct API model ID. [GPT-6.1 Sol ↗](https://developers.openai.com/api/docs/models/gpt-6.1-sol) ## Compare exact catalogue rows USD per 1M tokens. In / out are listed base rates; expand billing conditions before planning a request. LMArena scores measure the general preference board, not success on your engineering task. Unknown stays unknown. ### Pro-labelled catalogue rows | Model | LMArena | Input / output $/M | Context / max output | Capabilities & conditions | | --- | --- | --- | --- | --- | | [GPT-6.1 Sol Pro](https://undominated.ai/models/openai__gpt-6.1-sol-pro/) [Check](https://undominated.ai/check/openai__gpt-6.1-sol-pro/) [Compare](https://undominated.ai/compare/?models=openai%2Fgpt-6.1-sol-pro) [Full evidence ↗](https://undominated.ai/models/openai__gpt-6.1-sol-pro/) openai/gpt-6.1-sol-pro | Unrated | $2.00 / $10.00 Context tiers apply Billing details Cached input $0.100 Separate reasoning Not separately listed Above 272,000 input tokens: $4.00 in / $15.00 out; cached $0.200. Tool, media, cache-write and service-tier charges may add dimensions. Read the full model evidence. | 1,050,000 Output 128,000 | file · image · text Tools yes · reasoning yes Closed weights Released 2026-09-29 | ### Other generation members | Model | LMArena | Input / output $/M | Context / max output | Capabilities & conditions | | --- | --- | --- | --- | --- | | [GPT-6.1 Sol](https://undominated.ai/models/openai__gpt-6.1-sol/) [Check](https://undominated.ai/check/openai__gpt-6.1-sol/) [Compare](https://undominated.ai/compare/?models=openai%2Fgpt-6.1-sol) [Full evidence ↗](https://undominated.ai/models/openai__gpt-6.1-sol/) openai/gpt-6.1-sol | 1445.6 ±10.5 interval half-width Effort: max | $2.00 / $10.00 Context tiers apply Billing details Cached input $0.100 Separate reasoning Not separately listed Above 272,000 input tokens: $4.00 in / $15.00 out; cached $0.200. Tool, media, cache-write and service-tier charges may add dimensions. Read the full model evidence. | 1,050,000 Output 128,000 | file · image · text Tools yes · reasoning yes Closed weights Released 2026-09-29 | ## Sources and scope - [GPT-6.1 Sol ↗](https://developers.openai.com/api/docs/models/gpt-6.1-sol) Exact named models on the vendor platform; not a promise about every reseller Checked 2026-09-30 · official Markdown (the page URL plus .md) fetched with HTTP 200 and inspected; sha256 972f4265295eea723d5332016dc22cde03f46173fafcbcba5c23b24c8cee90c6. The same site answers 404 for /api/docs/models/gpt-6.1-sol-pro - [OpenAI reasoning guide ↗](https://developers.openai.com/api/docs/guides/reasoning) Exact named models on the vendor platform; not a promise about every reseller Checked 2026-09-22 · web opened; full official Markdown fetched with HTTP 200 and inspected Source review does not refresh a price or transplant a benchmark score. [Read the method](https://undominated.ai/methodology/) and [correction policy](https://undominated.ai/corrections/). ## Questions this page answers Are the GPT-6.1 family models interchangeable? No. These are exact catalogue rows with separate capability, pricing and rating evidence. Compare the checkpoint, serving endpoint, reasoning settings and required input types. A family name does not establish equivalent behaviour. How many OpenAI rows are compared here? 2 standard rows, of which 1 have an accepted LMArena general score and 2 have known input and output token rates. 0 related free or batch variants are listed separately. What do the prices and frontier counts mean? Prices below are listed US dollars per million input or output tokens, before request-specific context tiers and other billing dimensions. The frontier count comes from the global balanced view. Neither a family price range nor a benchmark difference proves your task will be cheaper or more successful. How current are the official notes? The linked family research was reviewed 2026-09-30. That date is separate from each accepted catalogue observation and each vendor’s effective date. An official note applies to its named platform, not automatically to every reseller. ## Continue your investigation - [Compare exact models](/compare/) - [Inspect model evidence](/models/) - [Check lifecycle notices](/deprecations/) - [Estimate local capacity](/self-host/)