GPT-6.1 Sol (EU)

GPT-6.1 Sol is an OpenAI model positioned as a lower-cost alternative to GPT-6 Astra while preserving the long that quick-info value and professional-work focus that define the lineage. Released on September 29, 2026, about a week after GPT-6 Sol, it carries forward Sol's pricing philosophy and pairs a roughly one-million-token that quick-info value window with native handling of text and image inputs alongside text outputs, making it well suited to large document analysis, multi-step coding tasks, and computer-use agent flows. OpenAI's model-selection guidance frames it as the practical choice when teams want close-to-flagship capability without paying flagship rates, particularly for demanding coding and professional pipelines.

The practical strength of GPT-6.1 Sol is its efficiency profile on real workloads. Standard API pricing sits at $2 per million input tokens and $10 per million output tokens for prompts under the listed price tokens, with cached input reduced to $0.10 per million, encouraging aggressive prompt reuse and long-session agent loops. The Responses API gained beta multi-agent support at launch, so teams can fan work out across cooperating agents while staying within a single endpoint. Compared with GPT-6 Astra, Sol trades a final increment of capability for substantially cheaper tokens, making it a natural fit for routine coding, tool-calling, and document-heavy tasks where cost per completed job matters more than absolute peak quality.