# GPT-6 Luna

    
OpenAI · released 22 Sep 2026 · small/fast tier of the GPT-6 generation · current
    
The small, fast tier of the GPT-6 generation, released 22 September 2026 with [GPT-6 Sol](../gpt-6-sol/) — trained with the same methods as [GPT-6 Astra](../gpt-6-astra/) and priced at $0.10/$0.50 per million tokens (a 50% cut from GPT-5.6 Luna’s promotional pricing). It is the free- and high-volume tier: the GPT-6 model Free and Go users reach, and the one labs and startups cite for cost-sensitive agent workloads.
    
Fresh page, Oct 2026. The generation-level launch record is fullest on [Astra’s page](../gpt-6-astra/); this page holds Luna specifics. Small tiers sometimes grow the most distinct characters (see [Haiku](../claude-3-haiku/), [4o mini](../gpt-4o-mini/)) — whether this one does is what a later pass should find. Corpus pass pending.

    
## Sources

    
### Official

    

      
- 2026-09-22 [Introducing GPT-6 Sol and Luna](https://openai.com/index/introducing-gpt-6-sol-and-luna/) — the launch: pricing, shared collaboration-style change, caching, alignment note.
      
- 2026-08-06 [Improving GPT-5.6 Sol in ChatGPT—and expanding access to GPT-5.6 Luna for free users](https://openai.com/index/improving-gpt-5-6-sol-in-chatgpt/) — context: the prior-generation Luna had already become the free-tier default, a slot GPT-6 Luna inherits.
      
- 2026-10-02 [A model guide for the GPT-6 family](https://openai.com/index/practical-guide-building-gpt-6/) — when-to-use-which across the tiers.
    
    
### Writing & commentary

    

      
- 2026-08-19 [Replit expands access to software creation with GPT-5.6 Luna](https://openai.com/index/replit/) and 2026-09-21 [V7 cuts costs 78% while boosting accuracy with GPT-5.6 Luna](https://openai.com/index/v7/) — customer case studies for the prior-generation Luna tier in cost-sensitive agent work (GPT-6 Luna takes the same slot). tk — GPT-6-Luna-specific day-of coverage.
    
    
### Tweets

    
tk — corpus pass pending; Luna-specific reads are sparse this early.

    
## Official record

    

      
- Released 22 September 2026 as gpt-6-luna, with [GPT-6 Sol](../gpt-6-sol/). In ChatGPT Work and Codex for paid tiers; “Free and Go users can access GPT‑6 Luna” in the app; in the API as gpt-6-luna. CONFIRMED
      
- Pricing: $0.10 / $0.50 per million tokens (input/output) — a 50% cut from GPT-5.6 Luna’s $0.20/$1.20 promotional pricing.
      
- Positioning: the “fast and affordable” tier, trained “with similar methods as GPT‑6 Astra” and sharing the family’s plainer collaboration style and caching improvements.
      
- tk — context window, knowledge cutoff, headline benchmarks for the Luna tier; checkpoint strings.
    

    
## History

    

      
- 2026-09-22 Released with the generation’s cost-efficiency push; the free-tier GPT-6 model and the one startups cite for high-volume agent runs (e.g. Replit, V7 on the prior-gen Luna).
      
- tk — whether GPT-6 Luna develops a distinct record; its deployment story and any character reads.
    

    
## Impressions

    
tk — too fresh; no attributed Luna-specific reads collected yet. The GPT-6 collaboration-style change (plainer, shorter, less jargon) applies to Luna as to its siblings; whether the smallest tier reads as its own creature is the open question.

    
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