Agentic Chat (GPT-6 Astra) layers a high-context OpenAI model into the GitLab Duo assistant, giving developers a single workspace where they can reason over large codebases, attach images or PDFs for review, and produce structured artifacts without leaving their repository. The third-party catalog that documents this variant positions GPT-6 Astra as OpenAI's most capable model for complex reasoning, coding, computer use, research, and document creation, suggesting a general-purpose design that prioritises multi-step problem solving rather than narrow single-task inference. In practice, the combination of a roughly 1.1 million-token context window with a 128,000-token output ceiling lets the assistant ingest sizable monorepos or long incident histories in one pass and return detailed plans, refactors, or written analyses in response.

Because the weights remain closed, Agentic Chat (GPT-6 Astra) is delivered exclusively through its hosted integration, which the catalog lists only via the GitLab Duo provider. The April 2026 knowledge cutoff and September 2026 release framing indicate that the model brings a recent training horizon to GitLab workflows, while support for text, image, and PDF inputs alongside text-only output makes it well suited to tasks like triaging pull requests with screenshots, summarising design documents, or generating structured summaries of attached logs. Teams looking to pair long-context reasoning with document and visual inputs inside a GitLab-native chat surface will find this variant aimed squarely at that hybrid of software engineering, research, and authoring work.