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Step 5 Preview
GPT-6 Luna
GPT-6 Luna is a proprietary model from OpenAI, released Sep 22, 2026. It ranks #168 of 351 on the LMArena text leaderboard with a rating of 1390, and #21 of 27 on the Vals Index with 52.32%. It costs $0.10 per million input tokens and $0.50 per million output tokens, with a 1.1M-token context window.
- Developer
- OpenAI
- Released
- Sep 22, 2026
- Context window
- 1.1M
- Price in / out, per 1M tokens
- $0.10 / $0.50
- Weights
- Proprietary
- Inputs
- Files, Images, Text
- Reasoning
- Yes
- Tool use
- Yes
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| Vals IndexVals AI | 52.32% | 21 / 27 | $0.45 | |
| Terminal-Bench 4.0Coding | 13.64% | 36 / 55 | $0.35 | |
| Vibe Code BenchCoding | 81.65% | 24 / 115 | $1.35 | |
| Code MigrationCoding | 46.67% | 18 / 28 | $0.83 | |
| Finance AgentFinance | 56.84% | 26 / 31 | $0.12 | |
| Finance IndexFinance | 53.05% | 24 / 31 | $0.15 | |
| Tax Agent BenchFinance | 19.95% | 51 / 76 | $0.19 | |
| Legal IndexLaw | 62.20% | 25 / 28 | $0.31 | |
| Legal Research BenchLaw | 30.29% | 51 / 85 | $0.44 | |
| MedCodeMedicine | 44.69% | 41 / 107 | $0.1 / $0.5 | |
| Terminal-Bench ScienceReasoning | 4.29% | 26 / 42 | $0.24 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1390 | 168 / 351 | 72.5K |
| CodingLMArena | 1438 | 124 / 346 | 16.5K |
| MathLMArena | 1410 | 146 / 339 | 4K |
| Creative writingLMArena | 1363 | 154 / 349 | 16.4K |
| Instruction followingLMArena | 1407 | 112 / 351 | 24.6K |
| Hard promptsLMArena | 1410 | 151 / 351 | 44.6K |
| Multi-turnLMArena | 1393 | 163 / 349 | 10.5K |
| Long queriesLMArena | 1407 | 136 / 330 | 31.1K |
| ExpertLMArena | 1439 | 104 / 305 | 7.5K |
| Legal and governmentIndustries | 1396 | 162 / 325 | 5.9K |
| Medicine and healthcareIndustries | 1351 | 208 / 325 | 5.1K |
| Business and financeIndustries | 1387 | 162 / 344 | 12.4K |
| ChineseLanguages | 1426 | 159 / 328 | 6K |
| SpanishLanguages | 1391 | 155 / 249 | 2.8K |
| GermanLanguages | 1376 | 147 / 261 | 1K |
| FrenchLanguages | 1406 | 150 / 252 | 3.1K |
| JapaneseLanguages | 1369 | 114 / 236 | 1.4K |
| WebDevLMArena | 1579 | 39 / 124 | 24.4K |
| VisionLMArena | 1216 | 85 / 146 | 3.7K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare GPT-6 Luna
OpenAI
The lab behind GPT and ChatGPT, which brought large language models to hundreds of millions of people. Founded 2015, based in San Francisco. openai.com
Questions
Who makes GPT-6 Luna?
GPT-6 Luna is made by OpenAI, founded 2015 and based in San Francisco.
How much does GPT-6 Luna cost?
$0.10 per million input tokens and $0.50 per million output tokens, at its provider’s list price.
What is GPT-6 Luna’s context window?
1.1M tokens (1,050,000).
How does GPT-6 Luna rank?
#168 of 351 on LMArena’s text leaderboard, rated 1390 (95% interval 1386–1395) from 72,504 votes, as of Oct 22, 2026.
Is GPT-6 Luna open source?
No. GPT-6 Luna is proprietary and served through its provider’s API.