A cheaper model request can still be an expensive workflow if it triggers retries, escalation, or manual repair. This guide treats GPT-6.1 Sol as a routing decision: compare the total cost of an accepted task, then decide which work should stay on Sol and which should reach a larger model. The examples are a planning framework, not a report of completed API trials. OpenAI released GPT-6.1 Sol on September 29, 2026, as a lower-cost reasoning model for agentic coding, computer use, document analysis, and multi-step professional work. The launch evidence supports evaluating Sol as a routing option. It does not support replacing GPT-6 Astra—or an existing production model—without workload-specific testing. The defensible rule is:
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