GPT-6 Luna benchmarks, pricing and specs
GPT-6 Luna is an OpenAI model released on September 22, 2026 that takes text and image input and produces text. It costs $0.10 per 1M input tokens and $0.50 per 1M output tokens and accepts up to 1,050,000 tokens of context. It scores 1443 Elo on Arena Text, #31 of 39 current models (Arena, measured October 8, 2026).
- Per 1M input tokens
- $0.10
- Per 1M output tokens
- $0.50
- Context window
- 1.05M
- Arena Text
- 1443 Elo · #31/39
Data verified October 12, 2026 · Dataset 2026-10-12
Key facts
- Provider
- OpenAI
- Model family
- GPT-6
- Release date
- September 22, 2026
- Status
- Current
- Access
- API only
- API model id
- Not reported
- Context window
- 1,050,000 tokens
- Max output
- 128,000 tokens
- Input
- text, image
- Output
- text
- Task families
- text, multimodal
- Declared capabilities
- reasoning
GPT-6 Luna pricing
It is tied for the cheapest of 37 current text models priced per 1M input tokens.
Independent benchmark results
Scores come from independent evaluators that ran the model themselves, pinned to a dated snapshot. Rank is among current models in the same snapshot. OpenAI's own launch figures are listed under strengths with the publisher named, because they are not measured the same way.
| Benchmark | Score | Rank | Measured | Source |
|---|---|---|---|---|
| Arena Text | 1443 Elo | #31 of 39 | October 8, 2026 | Arena · 2026-10-12 |
| GPQA Diamond | 90.5% | #23 of 37 | October 12, 2026 | Epoch AI · 2026-10-12 |
| FrontierMath Tiers 1-3 (v2) | 78.9% | #14 of 37 | October 12, 2026 | Epoch AI · 2026-10-12 |
| SimpleQA Verified | 41.4% | #25 of 34 | October 12, 2026 | Epoch AI · 2026-10-12 |
Strengths, cautions and best uses
Strengths
- OpenAI's budget tier at $0.10 per million input and $0.50 per million output, matching Claude Haiku 5.5 on both
- Keeps the full 1,050,000-token context window rather than cutting it down for the cheap tier
- The long-context surcharge starts at 272,000 tokens rather than Claude Haiku 5.5's 100,000, which is the more forgiving threshold of the two budget options
Cautions
- Prompts over 272,000 tokens are rebilled at $0.20 input and $0.75 output for the whole request
- A twentieth of GPT-6 Sol's price reflects a capability gap, not a discount on the same model
Best for
- High-volume summarisation, extraction and routing
- Long-context budget work, where the 272k threshold is more forgiving than Haiku 5.5's 100k
Alternatives to GPT-6 Luna
The closest current textmodels by price. The cheapest model that scores as well or better is listed first; failing that, the cheapest one within 3% of the benchmark's scale.
Claude Haiku 5.5
- Same price per 1M input tokens, $0.10
- 0.9 points lower on GPQA Diamond, 89.6 vs 90.5
- From Anthropic
GPT-4.1 nano
- Same price per 1M input tokens, $0.10
- 121 points lower on Arena Text, 1322 vs 1443
GPT-5.6 Luna
- 2.0x the price per 1M input tokens, $0.20 vs $0.10
- 9 points higher on Arena Text, 1452 vs 1443
Gemini 3.1 Flash-Lite
- 2.5x the price per 1M input tokens, $0.25 vs $0.10
- 8.7 points lower on GPQA Diamond, 81.8 vs 90.5
- From Google
Compare GPT-6 Luna with
- GPT-6 Luna vs Claude Haiku 5.5
- GPT-6 Luna vs Gemini 3.1 Flash-Lite
- GPT-6 Luna vs Gemini 3.5 Flash-Lite
- GPT-6 Luna vs GPT-4.1 mini
- GPT-6 Luna vs GPT-4.1 nano
- GPT-6 Luna vs GPT-4.1
- GPT-6 Luna vs GPT-5.6 Luna
- GPT-6 Luna vs GPT-6 Astra
- GPT-6 Luna vs GPT-6 Sol
- GPT-6 Luna vs Grok 4.3
- GPT-6 Luna vs Grok 4.7
- GPT-6 Luna vs Mistral Large 4
Articles about GPT-6 Luna
- Claude Sonnet 5.5 vs GPT-6 Luna: Cost, Speed and AccuracySeptember 29, 2026
Other GPT-6 models
GPT-6 Luna FAQ
How much does GPT-6 Luna cost?
GPT-6 Luna costs $0.10 per 1M input tokens and $0.50 per 1M output tokens at the standard tier. It is tied for the cheapest of 37 current text models priced per 1M input tokens. Source: OpenAI, verified October 11, 2026.
What is the context window of GPT-6 Luna?
GPT-6 Luna accepts up to 1,050,000 tokens of context. It can return up to 128,000 tokens in one response. That ranks #1 of 44 current text models by context length.
How does GPT-6 Luna score on independent benchmarks?
GPT-6 Luna scores 1443 Elo on Arena Text, #31 of 39 current models (Arena, measured October 8, 2026), 90.5% on GPQA Diamond, #23 of 37 current models (Epoch AI, measured October 12, 2026) and 78.9% on FrontierMath Tiers 1-3 (v2), #14 of 37 current models (Epoch AI, measured October 12, 2026). These are independent evaluations, not OpenAI's own launch figures.
Is GPT-6 Luna open source or API only?
GPT-6 Luna is available through OpenAI's API only; its weights are not published.
What are the best alternatives to GPT-6 Luna?
The closest current alternatives by price and measured performance are Claude Haiku 5.5 (same price per 1M input tokens, $0.10), GPT-4.1 nano (same price per 1M input tokens, $0.10), GPT-5.6 Luna (2.0x the price per 1M input tokens, $0.20 vs $0.10) and Gemini 3.1 Flash-Lite (2.5x the price per 1M input tokens, $0.25 vs $0.10).
Sources
- OpenAI API pricing · OpenAI · official · verified October 11, 2026
- GPT-6 Astra model reference · OpenAI · official · verified September 9, 2026
- Epoch AI Benchmarking Hub data (benchmark_data.zip) · Epoch AI · independent · verified October 12, 2026 · CC-BY-4.0
- Arena leaderboard dataset (lmarena-ai/leaderboard-dataset) · Arena · independent · verified October 12, 2026 · CC-BY-4.0
Cite this page
Van Data Team. "GPT-6 Luna Benchmarks, Pricing and Specs." AI Model Benchmark Dataset 2026-10-12. https://vandatateam.com/ai-model-benchmarks/gpt-6-luna
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Production evaluation
Deciding whether GPT-6 Luna fits your workload?
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