GPT-6 Luna
OpenAI · Fast & cheap · Sep 22, 2026New
The small, fast GPT-6 tier for high-volume work.
- Artificial Analysis Intelligence Index
- 38.1#19 of 29 · max effort
- API price per 1M tokens
- $0.10 / $0.50input / output · $0.20 blended
- Context window
- 1.1Mup to 128K output tokens
- Output speed
- 129 t/s1m 51s to first answer at max effort
Benchmark results
Each row shows this model (blue) against every other model in the catalogue (grey), worst on the left, best on the right.
Overall capability
- Artificial Analysis Intelligence Index38.1#19 of 29
Max effort
- Epoch Capabilities Index156.3#10 of 16
- LiveBench72%#18 of 23
Max effort
Coding
- Terminal-Bench 4.016.4%#12 of 13
Codex harness, max effort
- Arena WebDev1,582#18 of 27
Max effort
Agents & professional work
- GDPval-AA1,432#16 of 18
Max effort
Reasoning
- ARC-AGI-259.3%#10 of 11
Max effort
- ARC-AGI-30.2%#5 of 5
Medium effort
- FrontierMath (Tiers 1–3)79%#6 of 14
Max effort
Knowledge & science
- GPQA Diamond90.5%#13 of 14
Max effort
Human preference
- Arena Text1,443#19 of 24
Max effort
Reasoning effort trade-offs
The same model at different thinking budgets. More effort buys a higher intelligence score at a higher cost per task and a longer wait. Measured by Artificial Analysis.
| Effort | Score | Cost / task | First answer | Speed |
|---|---|---|---|---|
| No reasoning | 18.5 | $0.011 | 0.8s | 119 t/s |
| Low | 21.5 | $0.004 | 3.1s | 121 t/s |
| Medium | 29.9 | $0.018 | Not measured | Not measured |
| High | 32.9 | $0.029 | 21s | 112 t/s |
| Xhigh | 34.6 | $0.042 | 36s | 115 t/s |
| Max (headline score) | 38.1 | $0.068 | 1m 51s | 129 t/s |
Specs & pricing
- Developer
- OpenAI
- Released
- Sep 22, 2026
- Availability
- Generally available
- API model ID
gpt-6-luna- Weights
- Proprietary (API only)
- Reasoning
- Adjustable effort
- Knowledge cutoff
- May 2026
- Accepts
- Text, Image
- Produces
- Text
- Context window
- 1,050,000 tokens
- Max output
- 128,000 tokens
- Input price
- $0.10 / 1M tokens
- Output price
- $0.50 / 1M tokens
- Cached input
- $0.01 / 1M tokens
Prompts above 272K input tokens are billed at twice the input price and 1.5 times the output price for the whole request.
Closest alternatives
Models from other labs nearest to GPT-6 Luna on Artificial Analysis Intelligence Index.
Mistral Large 4
Mistral AI
Intelligence 38.4 · $1.36 / $4.18
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DeepSeek
Intelligence 39.5 · $0.30 / $1.20
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Alibaba
Intelligence 39.8 · $0.15 / $0.47
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