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OpenAI releases GPT-6.1 Sol, an upgrade to GPT-6 Sol

2026-09-30 · that day's edition · one of the day's three leads

On 29 September 2026 OpenAI said GPT-6.1 Sol nearly matches GPT-6 Astra on agentic coding, computer use and professional work at one fifth of Astra's standard token prices.

OpenAI DevDay 2026 Keynote (FULL): a video from OpenAI on YouTubeVideo: OpenAI on YouTube
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Key points

OpenAI published GPT-6.1 Sol, an upgrade to GPT-6 Sol, on 29 September 2026, according to its news feed. OpenAI says it nearly matches GPT-6 Astra on agentic coding, computer use and professional work at one fifth of Astra's standard input and output token prices. In the API the model is gpt-6.1-sol, at $2 per million input tokens, $0.10 per million cached input tokens and $10 per million output tokens. In ChatGPT it is available to Plus, Pro, Business, Enterprise and Edu users in ChatGPT Work and Codex, but not yet in Chat. On DeepSWE v1.1, in OpenAI's own evaluation, GPT-6.1 Sol matches GPT-6 Astra at roughly one fifth of the cost and beats GPT-6 Sol's best score by 6.4 percentage points. OpenAI says it will offer GPT-6.1 Sol Ultrafast in the coming days.

What it means for you analysis

The price and benchmark figures are OpenAI's own, and the DeepSWE result comes from its own evaluation, so treat "nearly matches Astra" as a claim to test on your tasks. The model is in ChatGPT Work and Codex but not yet in Chat, so people who use only Chat will not see it. OpenAI says GPT-6.1 Sol Ultrafast will be offered in the coming days, which is a plan and not a shipped product. If you pay for Astra-level usage on coding or computer-use work, run a sample of your own tasks on gpt-6.1-sol and compare the cost per finished task before you switch.

This part is our reading of the facts above. It adds no fact of its own.

What this rests on

  1. OpenAI introduced GPT-6.1 Sol as an upgrade to GPT-6 Sol that it says nearly matches GPT-6 Astra on agentic coding, computer use and professional work.

    narrowed to what the source supports
    Introducing GPT-6.1 Sol · OpenAI · 2026-09-29

  2. OpenAI says GPT-6.1 Sol gives near-Astra performance at one fifth of the standard input and output token prices of GPT-6 Astra. Quote (French copy): "Il rapproche Sol de GPT‑6 Astra sur les tâches exigeantes, à un cinquième des tarifs standard d’Astra pour les tokens d’entrée et de sortie, offrant aux développeurs plus de latitude pour créer et exécuter des agents performants à budget égal."

    Introducing GPT-6.1 Sol · OpenAI · 2026-09-29

  3. The API model name is gpt-6.1-sol, at $2 per million input tokens, $0.10 per million cached input tokens and $10 per million output tokens. Quote (French copy): "Les développeurs peuvent également y accéder via l’API OpenAI sous le nom gpt-6.1-sol . Ses tarifs API standard sont de 2 $ par million de tokens d’entrée, 0,10 $ par million de tokens d’entrée en cache et 10 $ par million de tokens de sortie."

    Introducing GPT-6.1 Sol · OpenAI · 2026-09-29

  4. GPT-6.1 Sol is available to Plus, Pro, Business, Enterprise and Edu users in ChatGPT Work and Codex, and not yet in Chat. Quote (French copy): "GPT‑6.1 Sol est disponible dès aujourd’hui pour tous les utilisateurs Plus, Pro, Business, Enterprise et Edu dans ChatGPT Work et Codex. Ces modèles ne sont pas encore disponibles dans Chat."

    Introducing GPT-6.1 Sol · OpenAI · 2026-09-29

  5. OpenAI says GPT-6.1 Sol matches GPT-6 Astra on DeepSWE v1.1 for about one fifth of the cost and beats the best GPT-6 Sol score by 6.4 percentage points, in OpenAI own evaluation. Quote (French copy): ""

    Introducing GPT-6.1 Sol · OpenAI · 2026-09-29

  6. OpenAI's news feed lists Introducing GPT-6.1 Sol with a publication date of Tue, 29 Sep 2026 10:00:00 GMT. Quote: "<pubDate>Tue, 29 Sep 2026 10:00:00 GMT</pubDate>"

    OpenAI News feed · OpenAI

  7. OpenAI says it will offer GPT-6.1 Sol Ultrafast in the coming days, with up to 8x faster token generation than standard speed in Codex. Quote: "In the coming days, we’ll also offer GPT‑6.1 Sol Ultrafast, with up to 8x faster token generation compared to its standard speed in Codex."

    Introducing GPT-6.1 Sol · OpenAI · 2026-09-29

  8. On DeepSWE v1.1, in OpenAI's own evaluation, GPT-6.1 Sol matches GPT-6 Astra at roughly one-fifth of the cost. Quote: "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" (OpenAI post says evaluations were performed in its own research environment or via its API.)

    Introducing GPT-6.1 Sol · OpenAI · 2026-09-29

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