GPT-6 Luna — reviews, specs & pricing

OpenAI's most efficient GPT-6 model for focused, high-volume tasks. 1.05M context, 128k max output, May 2026 knowledge cutoff, and $0.10/$0.50 per million tokens — the cheapest GPT-6 tier.

Summary

OpenAI's GPT-6 Luna is a highly efficient chat model engineered specifically for high-volume, focused tasks at a fraction of the cost of other frontier models. Featuring a massive 1.05M token context window and a generous 128k max output, it represents the most budget-friendly tier in the GPT-6 lineup. With a knowledge cutoff of May 2026, it successfully balances next-generation intelligence with unmatched operational cost-efficiency.

Sample use case

A financial services firm can leverage GPT-6 Luna to automate the compliance auditing of thousands of multi-page transaction logs and annual reports. By utilizing the massive 1.05M context window, developers can feed entire legal portfolios into a single prompt to extract anomalies, draft comprehensive summaries, and flag regulatory risks. Because Luna is priced at an ultra-low $0.10 per million input tokens, the firm can scale this high-volume document ingestion daily without incurring prohibitive API costs.

Specifications

  • Provider: openai
  • License: closed
  • Context: 1050k tokens
  • Input price: $0.1/M tok
  • Output price: $0.5/M tok
  • Released: 2026-09-22

Pros

  • Extremely affordable pricing at $0.10/$0.50 per million tokens
  • Massive 1.05M token input context window
  • Generous 128k maximum output capacity
  • Highly optimized for efficient, high-volume processing

Cons

  • Limited strictly to chat modalities
  • May 2026 knowledge cutoff limits real-time utility
  • Tailored for focused tasks rather than broad, complex reasoning

Average rating 0.0 from 0 community reviews on Reviuws.

Frequently asked questions

What is GPT-6 Luna?

OpenAI's GPT-6 Luna is a highly efficient chat model engineered specifically for high-volume, focused tasks at a fraction of the cost of other frontier models. Featuring a massive 1.05M token context window and a generous 128k max output, it represents the most budget-friendly tier in the GPT-6 lineup. With a knowledge cutoff of May 2026, it successfully balances next-generation intelligence with unmatched operational cost-efficiency.

How much does GPT-6 Luna cost?

GPT-6 Luna costs $0.1 per million input tokens and $0.5 per million output tokens.

Is GPT-6 Luna open source?

GPT-6 Luna is released under the closed license.