RouterHub

GPT-6 Sol and Luna: Match the Model to the Work

RouterHub Team · Updated 2026-09-23

OpenAI’s GPT-6 Sol and GPT-6 Luna are now available on RouterHub as openai/gpt-6-sol and openai/gpt-6-luna. Sol is positioned for complex coding and agentic work. Luna is positioned for focused, high-volume tasks. The useful starting point is the work your application needs to complete, rather than a single model choice for every request.

GPT-6 Sol and Luna at a glance

Model RouterHub model ID Start by evaluating it for
GPT-6 Sol openai/gpt-6-sol Multi-step coding and agentic workflows
GPT-6 Luna openai/gpt-6-luna Focused tasks repeated at high volume

OpenAI lists text and image input, text output, a 1,050,000-token context window, and a 128,000-token maximum output for both models. These are provider specifications; teams should verify the limits and features exposed by their RouterHub integration before relying on them.

When should you evaluate GPT-6 Sol?

Start with Sol when the task calls for a sequence of decisions, especially across code or tools. A coding assistant might trace a bug across files, propose a change, and check the result. Where the surrounding application supplies tools, an agent might decide what to do after each tool response. These are test scenarios, not promised outcomes.

Judge the completed task, not just the final answer. Did the model follow the constraints? Were its tool choices appropriate? Could a reviewer accept the result without substantial rework? Record where a person had to intervene.

When should you evaluate GPT-6 Luna?

OpenAI positions Luna for focused, high-volume work. It is a candidate when the task and expected output are clear: for example, classifying incoming messages against defined labels or extracting a small set of fields from documents.

For repeated work, test consistency across the full range of inputs. Include messy and ambiguous cases alongside routine ones. A task that looks simple in a demo can still create significant review work when it runs every day.

How should teams choose between them?

Build a small evaluation set from the requests you actually handle. Include straightforward cases, known failures, and edge cases. Set acceptance criteria before comparing models: completed-task quality, instruction adherence, response time, human review, and usage per successful task.

For coding or agent work, assess the full sequence, including tool selection where tool use is enabled, error recovery, and whether the model stayed within the task’s limits. For focused work, look at output consistency and the exception rate. If both models meet the quality threshold, compare the operational effort of running each workload.

A single application may use Sol for a multi-step coding task and Luna for a well-defined repeated step. Another team may choose one model for a simpler operating setup. Keep the exact RouterHub model IDs in your tests so the results remain clear as your workloads evolve.

Explore GPT-6 on RouterHub

Compare the model details and choose a task to test first.