Model comparison
GPT-5 Pro vs GPT-6 Luna
GPT-5 Pro is the stronger model overall, scoring 46.2 to 45.1 on the Noometry Index. GPT-6 Luna costs 206× less per token, which makes it the better buy when GPT-5 Pro's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in knowledge, where GPT-5 Pro leads 56.2 to 40.1.
- GPT-6 Luna is cheaper at $0.10 / $0.50 per million input/output tokens, against $15 / $120 for GPT-5 Pro.
- GPT-6 Luna accepts more context: 1.05M tokens versus 400K.
Side by side
| GPT-5 Pro | GPT-6 Luna | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 46.2 | 45.1 |
| Released | 2025-10-06 | 2026-09-22 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 1.05M |
| Max output | 272K | 128K |
| Input $ / M tokens | $15 | $0.10 |
| Output $ / M tokens | $120 | $0.50 |
| Results tracked | 12 | 18 |
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Category by category
Coding GPT-6 Luna leads
GPT-5 Pro: 43.4 (#77), GPT-6 Luna: 54.7 (#24)
| Benchmark | GPT-5 Pro | GPT-6 Luna |
|---|---|---|
| DeepSWE | — | 66.6% |
| FrontierCode | — | 42.4% |
| LMArena WebDev | — | 1583 |
| WeirdML | 60.4% | — |
| LMArena Coding | — | 1448 |
| AlgoTune | 1.31 | — |
Reasoning GPT-5 Pro leads
GPT-5 Pro: 39.2 (#52), GPT-6 Luna: 31.7 (#68)
| Benchmark | GPT-5 Pro | GPT-6 Luna |
|---|---|---|
| ARC-AGI-2 | 18.3% | — |
| SimpleBench | 61.6% | — |
| Kagi LLM Benchmark | 76.8% | — |
| NYT Connections (extended) | — | 68.7% |
| ARC-AGI-1 | 70.2% | — |
| EnigmaEval | 18.8% | — |
| LMArena Hard Prompts | — | 1415 |
| Epoch Capabilities Index | 150.26 | — |
Math GPT-5 Pro leads
GPT-5 Pro: 48.0 (#53), GPT-6 Luna: 35.6 (#140)
| Benchmark | GPT-5 Pro | GPT-6 Luna |
|---|---|---|
| FrontierMath (Tiers 1-3) | 55.8% | — |
| FrontierMath Tier 4 | 19.5% | — |
| LMArena Math | — | 1396 |
| FrontierMath Tier 4 (v1) | 14.6% | — |
Knowledge GPT-5 Pro leads
GPT-5 Pro: 56.2 (#39), GPT-6 Luna: 40.1 (#110)
| Benchmark | GPT-5 Pro | GPT-6 Luna |
|---|---|---|
| Humanity's Last Exam | 31.6% | — |
| LMArena Expert | — | 1458 |
Multimodal Not comparable
GPT-5 Pro: —, GPT-6 Luna: 42.0 (#27)
| Benchmark | GPT-5 Pro | GPT-6 Luna |
|---|---|---|
| Furniture Assembly | — | 44.2% |
Multilingual Not comparable
GPT-5 Pro: —, GPT-6 Luna: 51.0 (#111)
| Benchmark | GPT-5 Pro | GPT-6 Luna |
|---|---|---|
| LMArena Non-English | — | 1390 |
| LMArena Chinese | — | 1425 |
| LMArena Russian | — | 1392 |
| LMArena Spanish | — | 1416 |
Instruction Following Not comparable
GPT-5 Pro: —, GPT-6 Luna: 74.7 (#85)
| Benchmark | GPT-5 Pro | GPT-6 Luna |
|---|---|---|
| LMArena Instruction Following | — | 1414 |
Long Context Not comparable
GPT-5 Pro: —, GPT-6 Luna: 43.3 (#95)
| Benchmark | GPT-5 Pro | GPT-6 Luna |
|---|---|---|
| LMArena Longer Query | — | 1417 |
Writing & Preference Not comparable
GPT-5 Pro: —, GPT-6 Luna: 58.4 (#115)
| Benchmark | GPT-5 Pro | GPT-6 Luna |
|---|---|---|
| LMArena Text | — | 1392 |
| LMArena Creative Writing | — | 1357 |
| LMArena Multi-Turn | — | 1400 |
Frequently asked questions
Is GPT-5 Pro better than GPT-6 Luna?
GPT-5 Pro is the stronger model overall, scoring 46.2 to 45.1 on the Noometry Index. GPT-6 Luna costs 206× less per token, which makes it the better buy when GPT-5 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5 Pro or GPT-6 Luna?
GPT-6 Luna is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; GPT-5 Pro lists at $15 and $120.
Is GPT-5 Pro or GPT-6 Luna better for coding?
GPT-6 Luna scores higher on coding benchmarks: 54.7 versus 43.4 in the Noometry coding category.
Which has the bigger context window?
GPT-6 Luna does, with 1.05M tokens against 400K.
How many benchmarks do GPT-5 Pro and GPT-6 Luna share?
0 benchmarks have published results for both models. GPT-5 Pro has 12 scored results on Noometry and GPT-6 Luna has 18.