GPT-6.1 Sol

Developers and users can use it for coding, document understanding, computer-use tasks, and multi-step business or scientific workflows.

Availability

Available today to Plus, Pro, Business, Enterprise, and Edu users in ChatGPT Work and Codex; available through the OpenAI API as gpt-6.1-sol; not yet available in Chat

Pricing model

$2 per million input tokens, $0.10 per million cached input tokens, and $10 per million output tokens

Deployment

ChatGPT Work, Codex, and OpenAI API

Privacy

US and EU data residency

Licence

Not established

• Ultrafast mode reduces the time between generated output tokens. ^[1]

  Use gpt-6.1-sol with service_tier: "ultrafast" to reduce the time between generated output tokens.

• Ultrafast mode is available to all API users, subject to rate limits. ^[1]

  It is available to all API users, subject to rate limits, with global processing and US and EU data residency.

• Use `gpt-6.1-sol` with `service_tier: "ultrafast"` in the Responses API. ^[1]

  Use gpt-6.1-sol with service_tier: "ultrafast" to reduce the time between generated output tokens.

• Ultrafast mode has global processing and US and EU data residency. ^[1]

  It is available to all API users, subject to rate limits, with global processing and US and EU data residency.

• GPT-6.1 Sol achieves 86.6% accuracy on the COBOL migration evaluation at low reasoning effort. ^[2]

  On our COBOL migration evaluation, GPT‑6.1 Sol achieves 86.6% accuracy at low reasoning effort, compared with just 5.4% for GPT‑5.6 Sol, while costing 39% less.

• GPT-6.1 Sol reaches 97.9% accuracy on the COBOL migration evaluation at higher reasoning effort. ^[2]

  At higher reasoning effort, accuracy reaches 97.9%, bringing the evaluation close to saturation.

• At low reasoning effort, GPT-6.1 Sol costs 61% of GPT-5.6 Sol's API cost. ^[2]

  On this evaluation, GPT‑6.1 Sol achieves 86.6% accuracy at low reasoning effort, compared with GPT‑5.6 Sol’s 5.4% at the same setting at just 61% of the API cost.

• The announcement says production use still requires expert review and testing against the system's business rules and dependencies. ^[2]

  Behavior-preserving capabilities like these are useful for teams maintaining and modernizing older systems, though applying it to production software still requires expert review and testing against the system’s business rules and dependencies.

• GPT-6.1 Sol is available to Plus, Pro, Business, Enterprise, and Edu users in ChatGPT Work and Codex. ^[3]

  GPT-6.1 Sol is available starting today to all Plus, Pro, Business, Enterprise, and Edu users in ChatGPT Work and Codex.

• Developers can access GPT-6.1 Sol through the OpenAI API as gpt-6.1-sol. ^[3]

  Developers can also access it through the OpenAI API as gpt-6.1-sol.

• Standard API prices are $2 per million input tokens, $0.10 per million cached input tokens, and $10 per million output tokens. ^{[3] [4]}

  Its standard API prices are $2 per million input tokens, $0.10 per million cached input tokens, and $10 per million output tokens.

• On DeepSWE v1.1, GPT-6.1 Sol matches GPT-6 Astra at roughly one-fifth of the cost. ^[3]

  On **DeepSWE v1.1**, which evaluates complex software-engineering tasks in real codebases, GPT-6.1 Sol matches GPT-6 Astra at roughly one-fifth of the cost, while eclipsing GPT-6 Sol’s best score by 6.4 percentage points at a lower reasoning effort and cost.

• On the OSWorld 2.0 offline set, GPT-6.1 Sol outperforms GPT-6 Sol by seven percentage points at maximum reasoning effort. ^[3]

  On **OSWorld 2.0**’s offline set, which evaluates agents on demanding computer-use workflows, GPT-6.1 Sol outperforms GPT-6 Sol by seven percentage points at maximum reasoning effort at less than half the cost.

• GPT-6 Astra should be used for the most difficult scientific research tasks. ^[3]

  GPT-6 Astra still achieves the highest score among the models tested at 68.1%, and should be used for the most difficult scientific research tasks.

• Turn a prompt into an editable slide, poster, or dashboard Weekly brief 2026-W41
• Extract document layout and chart data, not just text Daily brief 2026-10-08
• OpenAI introduces GPT-6.1 Sol for coding and multi-step workflows Daily brief 2026-09-29