OpenAI
GPT-6 Luna
GPT-6 Luna is a OpenAI model with 1.05M context, $0.10 in / $0.50 out per million tokens, last verified September 26, 2026. Open weights: no. Public-board scores are linked to the publisher; vendor-only figures stay in the watch-out, not on the board.
GPT-6 Luna is OpenAI's cheapest current model at $0.10/$0.50 — the direct successor to GPT-5.6 Luna at half the price, with the full 1.05M-token context.
Catalog record checked September 26, 2026Individual provider fields may change
| Specification | GPT-6 Luna |
|---|---|
| Provider | OpenAI |
| Tier | Budget |
| Context window | 1.05M |
| Max output | 128K |
| Input / 1M tokens | $0.10 |
| Output / 1M tokens | $0.50 |
| Weights | Closed |
| Parameters | GPT-6 low-cost tier |
| Reasoning levels | none, low, medium, high, xhigh, max |
| Modalities | text, image |
| API model id | gpt-6-luna |
| Released | September 22, 2026 |
Pricing tiers: Direct successor to GPT-5.6 Luna at half the price. Cached input $0.01/MTok; cache writes $0.125. Above 272K input the whole request bills $0.20/$0.75 ($0.02 cached). Batch/Flex $0.05/$0.25; Fast mode $0.20/$1.00. Knowledge cutoff May 18 2026.
Verified evidence
Published benchmark results
Each result keeps its source and measurement date visible. A missing benchmark is not treated as a zero.
| Benchmark | Score | Measured | Source |
|---|---|---|---|
| Artificial Analysis Intelligence Index [max] | 37.3 | 2026-09-26 | Artificial Analysis · View source |
| DeepSWE 1.1 [max] | 66.6 | 2026-09-22 | OpenAI — Introducing GPT-6 Sol and Luna (vendor; not yet on Datacurve's board) · View source |
Best for
- High-volume chat and extraction
- Classification
- Cost-capped agent loops
Watch out
History
GPT-6 Luna timeline
Release and status events for this model that passed two-source verification — dated, sourced, and linked.
- GPT-6 LunaReleaseSeptember 22, 2026
OpenAI's new cheapest model: GPT-6 Luna at $0.10/$0.50 per MTok (cached $0.01) with a 1.05M-token context, replacing GPT-5.6 Luna at half the price.
OpenAI — Introducing GPT-6 Sol and Luna
Source receipts
Catalog figures for this model were checked against the following sources.
- OpenAI — Introducing GPT-6 Sol and Luna (accessed 2026-09-26)
- OpenAI model docs — gpt-6-luna (1.05M context, 128K output) (accessed 2026-09-26)
- OpenAI API pricing (gpt-6-luna $0.10/$0.50, cached $0.01) (accessed 2026-09-26)
Common questions
GPT-6 Luna
Answered from the verified figures on this page rather than general guidance.
How much does GPT-6 Luna cost per million tokens?
What is GPT-6 Luna's context window?
What is GPT-6 Luna best for?
Compare it
Featured head-to-head comparisons
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