GPT-6 Luna
OpenAI's ten-cent model: the one every ChatGPT Free user now has, and the one Haiku users keep comparing themselves to.
Key facts
- Score
- 66 / 100, rank #10
- Price
- $0.10 in · $0.50 out per 1M tokens (OpenAI API pricing)
- Blended price
- $0.20 per 1M tokens (3 input : 1 output)
- Context window
- 1M
- Open weights
- No
- Best for
- ChatGPT Free and Go tier, Simple extraction, Cost floors
GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens on OpenAI's list price (OpenAI API pricing, read Oct 10, 2026).
Independent evals
| Benchmark | Result | Who ran it | Read |
|---|---|---|---|
| Artificial Analysis Intelligence Index | 38 | Artificial Analysis LLM leaderboard | Oct 10, 2026 |
- Vendor list price: $0.10 in / $0.50 out (OpenAI API pricing)
- Artificial Analysis output speed: 137 tokens/s (Artificial Analysis LLM leaderboard)
Questions people ask
How much does GPT-6 Luna cost?
GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens on OpenAI's list price (OpenAI API pricing, read Oct 10, 2026).
How good is GPT-6 Luna?
GPT-6 Luna ranks #10 of 12 on the Models at Work leaderboard with a score of 66 out of 100 (October 2026 edition). OpenAI's ten-cent model: the one every ChatGPT Free user now has, and the one Haiku users keep comparing themselves to.
What is GPT-6 Luna best for?
GPT-6 Luna is best for chatgpt free and go tier, simple extraction, cost floors.
What are GPT-6 Luna's benchmark scores?
Artificial Analysis Intelligence Index: 38 (Artificial Analysis LLM leaderboard).
What is GPT-6 Luna's context window?
GPT-6 Luna has a 1M token context window according to OpenAI.
Is GPT-6 Luna open weights?
No. GPT-6 Luna is a proprietary model available through OpenAI's API and partner clouds.
Compare GPT-6 Luna
- GPT-6 Luna vs Claude Opus 5.5
- GPT-6 Luna vs GPT-6 Astra
- GPT-6 Luna vs Gemini 4 Argon
- GPT-6 Luna vs Claude Sonnet 5.5
- GPT-6 Luna vs GPT-6.1 Sol
- GPT-6 Luna vs Claude Fable 5.1
- GPT-6 Luna vs Claude Haiku 5.5
- GPT-6 Luna vs Muse Spark 1.3
- GPT-6 Luna vs DeepSeek Flash (4.1)
- GPT-6 Luna vs Kimi K3
- GPT-6 Luna vs Grok 4.7
Methodology: Score is 0 to 100: 50% independent evals normalised within this table, 20% price-performance, 15% practitioner sentiment from Signals and community threads, 15% operational fit (context, speed, availability, open weights). Models within three points are a tie in practice. Vendor-published figures are labelled as such and never counted as independent. Our coverage: read the article.