# GPT-6 Luna

OpenAI, released 2026-09-22

**Verdict: conditional.** GPT-6 Luna is OpenAI's new budget model and the cheapest way into GPT-6, at half GPT-5.6 Luna's input rate, with a 1.05M-token context and text and image input. Conditional because every published result is OpenAI's own and prompts over 272K input tokens bill at higher rates. GPT-5.6 Luna stays on the price list with no deprecation notice, so migration is optional. Right for teams running high-volume, everyday API work at scale. Last verified 2026-10-02.

## Pricing

- Input: $0.10 / 1M tokens
- Output: $0.50 / 1M tokens
- Context: 1.05M ctx; over 272K $0.20/$0.75; cache $0.01

## Strengths

- High-volume, low-cost calls: $0.10 input and $0.50 output per 1M tokens, cached input $0.01, batch $0.05/$0.25
- Budget coding agents: OpenAI reports 66.6% on DeepSWE v1.1 at max effort, against 68.8% for GPT-6 Sol
- Long documents on a small budget: a 1,050,000-token context window and up to 128,000 output tokens
- Trying it without an API key: Free and Go users get it in the ChatGPT desktop app
- Long prompts budgeted off the headline rate: over 272K input tokens it bills $0.20 input and $0.75 output per 1M
- Decisions that need independent benchmarks: every published result is OpenAI's own

## Benchmarks

- DeepSWE v1.1, max effort (OpenAI-reported): 66.6% (https://openai.com/index/introducing-gpt-6-sol-and-luna)

## Sources

- [OpenAI: Introducing GPT-6 Sol and Luna](https://openai.com/index/introducing-gpt-6-sol-and-luna)
- [OpenAI API docs: gpt-6-luna model (also pricing, changelog, deprecations)](https://developers.openai.com/api/docs/models/gpt-6-luna)
- [OpenAI API pricing (Life sciences models)](https://developers.openai.com/api/docs/pricing)
- [OpenAI API deprecations (2026-11-05 GPT-5.5-Cyber entry)](https://developers.openai.com/api/docs/deprecations)
- [OpenAI API changelog (Oct 30)](https://developers.openai.com/api/docs/changelog)

Canonical: https://neomanex.com/models/gpt-6-luna