Three Unverified 'GPT-6' Model Listings Appear on OpenRouter: Sol Pro, Luna, and Luna Pro

What happened

Three separate model pages referencing "OpenAI: GPT-6 Sol Pro," "OpenAI: GPT-6 Luna," and "OpenAI: GPT-6 Luna Pro" appeared on OpenRouter, a third-party API aggregator that lists models from multiple providers. The pages carry OpenAI's name and a GPT-6 designation, but as of this writing, OpenAI has not published any official announcement, blog post, or press release confirming these as legitimate, shipped models.

No verified specifications are available for any of the three listings. Context window size, input and output pricing per 1M tokens, parameter count, training data cutoff, and benchmark scores have not been disclosed by OpenAI for any of these names. OpenRouter's own listing pages typically populate with technical details once a provider formally connects an endpoint, but the raw source material here contains no such figures.

Why this matters — and why caution is warranted

Third-party routing platforms like OpenRouter sometimes list placeholder pages, test endpoints, or names sourced from leaks before a company makes an official statement. The appearance of three distinct "GPT-6" variants — Sol Pro, Luna, and Luna Pro — in a single wave, with no accompanying OpenAI communication, is consistent with either an early/staged rollout, an unannounced internal test surfaced publicly, or a naming scheme still being finalized. It could also reflect listings that were provisioned automatically and are not yet live for general use.

The naming pattern itself is notable: "Sol" and "Luna" suggest OpenAI may be moving toward celestial-themed sub-brand names within a GPT-6 family, similar to how prior generations used suffixes like "mini," "turbo," or "o" to differentiate speed, cost, and capability tiers. A "Pro" suffix on two of the three names implies at least two capability or pricing tiers per base model, but without confirmed pricing or benchmark data, any comparison to GPT-5-class models remains speculative.

What we don't know

• Whether GPT-6 has been officially confirmed by OpenAI as a released model family
• Context window sizes for Sol Pro, Luna, or Luna Pro
• Input/output token pricing for any of the three
• Benchmark performance on standard evaluations (MMLU, HumanEval, or others)
• Whether these are multimodal, text-only, or reasoning-focused models
• Release dates or rollout timelines

What this means

Treat these listings as unconfirmed until OpenAI issues an official statement. Aggregator sites can surface model names before a company formally announces them, and history shows such early listings sometimes get pulled, renamed, or delayed. Builders and engineers should avoid making integration decisions based on these pages alone. The prudent move is to wait for OpenAI's own documentation, pricing page, or API changelog before treating GPT-6 Sol Pro, Luna, or Luna Pro as production-ready options. If confirmed, a three-tier GPT-6 launch would mark a significant structural shift in OpenAI's model lineup — but that confirmation has not yet arrived.