GPT-6 Luna Pro

GPT-6 Luna Pro is presented as a higher-quality serving variant of OpenAI's GPT-6 Luna, distinguished by setting the reasoning mode to "pro" so the underlying model spends more deliberation on difficult prompts. According to OpenRouter's listing, the model is attributed to OpenAI and links to OpenAI's developer documentation on reasoning-mode configuration, framing Luna Pro as the right choice when standard Luna responses need extra rigor on multi-step or analytical work. This positioning suggests a practical fit for coding assistance, structured analysis, and tool-driven workflows where deeper reasoning outweighs the cost of faster, lighter modes.

For practical deployment, GPT-6 Luna Pro is offered with a very large 1.05 million-token that quick-info value window on the OpenRouter gateway, enabling it to ingest lengthy documents, codebases, or multi-turn agent histories in a single pass. The same listing prices access at roughly $0.10 per million input tokens and $0.50 per million output tokens, with a discounted batch variant available for asynchronous workloads that processes tokens at half those headline rates. The combination of pro-mode reasoning, an unusually wide that quick-info value, and batch-friendly economics makes it well suited to long-document reasoning pipelines, multi-file code review, and agentic applications that benefit from careful deliberation over sprawling inputs.