Breaking

OpenAI Rolls Out GPT-6.1 Sol for ChatGPT Work and Codex

September 29, 2026 at 13:06 EDT

Foundation Models
AI Agents
Software Dev & Coding

OpenAI began rolling out GPT-6.1 Sol to ChatGPT Work and Codex on September 29, positioning the model as a lower-cost option for complex coding, computer-use and professional workflows that approaches Astra-level performance. The ChatGPT release notes describe a rollout that starts with Pro users and expands to Plus, Business, Enterprise and Edu.

Sep. 29, 2026 - OpenAI

GPT-6.1 Sol fills the middle tier

A near-Astra model targets complex coding, computer use and professional workflows at Sol-level token prices.

Input price

per 1M tokens

Output price

$10

per 1M tokens

Context window

1.05M

tokens

Max output

128K

tokens

Output price: Sol vs Astra

GPT-6.1 Sol

$10

GPT-6 Astra

$50

Each block equals $10 per 1M output tokens.

Choose task

Code, apps, documents or computer-use work.

Set effort

Low through max reasoning, with medium as default.

Use tools

Tool calling runs through the Responses API.

Compare quality

Measure task cost and outcomes against Astra.

Why builders may try it

The model promises near-Astra capability for repeated, long-running work at a much lower per-token price.

What teams must test

Real workflows should check quality, tool use and escalation needs before making it the default.

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