# GPT-5.6 Luna vs Sonar Reasoning Pro

> GPT-5.6 Luna has enough public results to be ranked (#30); Sonar Reasoning Pro does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/gpt-5-6-luna-vs-sonar-reasoning-pro
- Last updated: 2026-10-12
- Shared benchmarks: 0

## Summary

- GPT-5.6 Luna is cheaper at $0.20 / $1.20 per million input/output tokens, against $2 / $8 for Sonar Reasoning Pro.
- GPT-5.6 Luna accepts more context: 1.05M tokens versus 128K.

## Snapshot

| | GPT-5.6 Luna | Sonar Reasoning Pro |
|---|---|---|
| Provider | OpenAI | Perplexity |
| Noometry Index | 54.6 | — |
| Rank | 30 | — |
| Context | 1.05M | 128K |
| Input $/M | $0.20 | $2 |
| Output $/M | $1.20 | $8 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.6 Luna: 54.5 (#28)
- Sonar Reasoning Pro: —

| Benchmark | GPT-5.6 Luna | Sonar Reasoning Pro |
|---|---|---|
| DeepSWE | 67.2% | — |
| FrontierCode | 39.8% | — |
| CursorBench | 35.9% | — |
| LMArena WebDev | 1519 | — |
| SciCode | 53.6% | — |
| WeirdML | 60.9% | — |
| LMArena Coding | 1466 | — |
| ALE-Bench | 1,667 | — |

## Agentic & Tool Use

- GPT-5.6 Luna: 34.4 (#45)
- Sonar Reasoning Pro: —

| Benchmark | GPT-5.6 Luna | Sonar Reasoning Pro |
|---|---|---|
| APEX-Agents | 43% | — |
| BALROG | 45.6% | — |
| GDP.pdf | 22.7% | — |
| LMArena Search | — | 1139 |
| Vending-Bench 2 | 4,095 | — |

## Reasoning

- GPT-5.6 Luna: 47.6 (#43)
- Sonar Reasoning Pro: —

| Benchmark | GPT-5.6 Luna | Sonar Reasoning Pro |
|---|---|---|
| ARC-AGI-2 | 59.5% | — |
| SimpleBench | 46.8% | — |
| Kagi LLM Benchmark | 49.1% | — |
| NYT Connections (extended) | 69.4% | — |
| ARC-AGI-1 | 88% | — |
| CritPt | 20.6% | — |
| Chess Puzzles | 40% | — |
| LMArena Hard Prompts | 1451 | — |
| Mystery Game Puzzles | 21% | — |
| DTBench | 89.1% | — |
| LMCA | 48.5% | — |
| Surface Evolver Bench | 61.9% | — |
| Epoch Capabilities Index | 156.39 | — |

## Math

- GPT-5.6 Luna: 77.7 (#14)
- Sonar Reasoning Pro: —

| Benchmark | GPT-5.6 Luna | Sonar Reasoning Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 82.1% | — |
| FrontierMath Tier 4 | 61% | — |
| OTIS Mock AIME 2024-2025 | 98.3% | — |
| ProofBench | 60% | — |
| LMArena Math | 1458 | — |

## Knowledge

- GPT-5.6 Luna: 58.5 (#34)
- Sonar Reasoning Pro: —

| Benchmark | GPT-5.6 Luna | Sonar Reasoning Pro |
|---|---|---|
| GPQA Diamond | 91.6% | — |
| SimpleQA Verified | 41% | — |
| LMArena Expert | 1478 | — |

## Multimodal

- GPT-5.6 Luna: 42.7 (#28)
- Sonar Reasoning Pro: —

| Benchmark | GPT-5.6 Luna | Sonar Reasoning Pro |
|---|---|---|
| LMArena Vision | 1258 | — |
| Blueprint-Bench 2 | 22.6% | — |
| Furniture Assembly | 42.5% | — |
| LMArena Document | 1457 | — |

## Multilingual

- GPT-5.6 Luna: 52.8 (#78)
- Sonar Reasoning Pro: —

| Benchmark | GPT-5.6 Luna | Sonar Reasoning Pro |
|---|---|---|
| LMArena Non-English | 1417 | — |
| LMArena Chinese | 1470 | — |
| LMArena French | 1456 | — |
| LMArena German | 1454 | — |
| LMArena Japanese | 1411 | — |
| LMArena Korean | 1415 | — |
| LMArena Russian | 1428 | — |
| LMArena Spanish | 1448 | — |

## Instruction Following

- GPT-5.6 Luna: 75.6 (#57)
- Sonar Reasoning Pro: —

| Benchmark | GPT-5.6 Luna | Sonar Reasoning Pro |
|---|---|---|
| LMArena Instruction Following | 1437 | — |

## Long Context

- GPT-5.6 Luna: 43.9 (#82)
- Sonar Reasoning Pro: —

| Benchmark | GPT-5.6 Luna | Sonar Reasoning Pro |
|---|---|---|
| LMArena Longer Query | 1436 | — |

## Writing & Preference

- GPT-5.6 Luna: 68.0 (#29)
- Sonar Reasoning Pro: —

| Benchmark | GPT-5.6 Luna | Sonar Reasoning Pro |
|---|---|---|
| LMArena Text | 1431 | — |
| LMArena Creative Writing | 1396 | — |
| EQ-Bench Creative Writing | 1829 | — |
| EQ-Bench 4 | 1156 | — |
| LMArena Multi-Turn | 1434 | — |

## FAQ

### Is GPT-5.6 Luna better than Sonar Reasoning Pro?

GPT-5.6 Luna has enough public results to be ranked (#30); Sonar Reasoning Pro does not yet, so treat this comparison as directional.

### Which is cheaper, GPT-5.6 Luna or Sonar Reasoning Pro?

GPT-5.6 Luna is cheaper. It lists at $0.20 per million input tokens and $1.20 per million output tokens; Sonar Reasoning Pro lists at $2 and $8.

### Which has the bigger context window?

GPT-5.6 Luna does, with 1.05M tokens against 128K.

### How many benchmarks do GPT-5.6 Luna and Sonar Reasoning Pro share?

0 benchmarks have published results for both models. GPT-5.6 Luna has 52 scored results on Noometry and Sonar Reasoning Pro has 1.