Model comparison
Devstral 2 vs GPT-5.6 Luna
GPT-5.6 Luna has enough public results to be ranked (#30); Devstral 2 does not yet, so treat this comparison as directional.
Last verified . 1 shared benchmarks.
Mistral AISummary
- They share 1 benchmark with published results for both. Devstral 2 scores higher in 0 categories and GPT-5.6 Luna in 1 category; one gap is clear of the uncertainty.
- The widest gap is in coding, where GPT-5.6 Luna leads 54.5 to 33.2.
- GPT-5.6 Luna is cheaper at $0.20 / $1.20 per million input/output tokens, against $0.40 / $2 for Devstral 2.
- GPT-5.6 Luna accepts more context: 1.05M tokens versus 262K.
- Devstral 2 has downloadable open weights; the other is API-only.
Side by side
| Devstral 2 | GPT-5.6 Luna | |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Noometry Index | 36.1 | 54.6 |
| Released | 2025-12-09 | 2026-07-09 |
| Weights | Open | Proprietary |
| Context window | 262K | 1.05M |
| Max output | 262K | 128K |
| Input $ / M tokens | $0.40 | $0.20 |
| Output $ / M tokens | $2 | $1.20 |
| Results tracked | 2 | 52 |
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Category by category
Coding GPT-5.6 Luna leads
Devstral 2: 33.2 (#261), GPT-5.6 Luna: 54.5 (#28)
| Benchmark | Devstral 2 | GPT-5.6 Luna |
|---|---|---|
| LMArena WebDev | 1197 | 1519 |
| DeepSWE | — | 67.2% |
| FrontierCode | — | 39.8% |
| SWE-bench Verified (bash only) | 53.8% | — |
| CursorBench | — | 35.9% |
| SciCode | — | 53.6% |
| WeirdML | — | 60.9% |
| LMArena Coding | — | 1466 |
| ALE-Bench | — | 1,667 |
Agentic & Tool Use Not comparable
Devstral 2: —, GPT-5.6 Luna: 34.4 (#45)
| Benchmark | Devstral 2 | GPT-5.6 Luna |
|---|---|---|
| APEX-Agents | — | 43% |
| BALROG | — | 45.6% |
| GDP.pdf | — | 22.7% |
| Vending-Bench 2 | — | 4,095 |
Reasoning Not comparable
Devstral 2: —, GPT-5.6 Luna: 47.6 (#43)
| Benchmark | Devstral 2 | GPT-5.6 Luna |
|---|---|---|
| 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 Not comparable
Devstral 2: —, GPT-5.6 Luna: 77.7 (#14)
| Benchmark | Devstral 2 | GPT-5.6 Luna |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 82.1% |
| FrontierMath Tier 4 | — | 61% |
| OTIS Mock AIME 2024-2025 | — | 98.3% |
| ProofBench | — | 60% |
| LMArena Math | — | 1458 |
Knowledge Not comparable
Devstral 2: —, GPT-5.6 Luna: 58.5 (#34)
| Benchmark | Devstral 2 | GPT-5.6 Luna |
|---|---|---|
| GPQA Diamond | — | 91.6% |
| SimpleQA Verified | — | 41% |
| LMArena Expert | — | 1478 |
Multimodal Not comparable
Devstral 2: —, GPT-5.6 Luna: 42.7 (#28)
| Benchmark | Devstral 2 | GPT-5.6 Luna |
|---|---|---|
| LMArena Vision | — | 1258 |
| Blueprint-Bench 2 | — | 22.6% |
| Furniture Assembly | — | 42.5% |
| LMArena Document | — | 1457 |
Multilingual Not comparable
Devstral 2: —, GPT-5.6 Luna: 52.8 (#78)
| Benchmark | Devstral 2 | GPT-5.6 Luna |
|---|---|---|
| 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 Not comparable
Devstral 2: —, GPT-5.6 Luna: 75.6 (#57)
| Benchmark | Devstral 2 | GPT-5.6 Luna |
|---|---|---|
| LMArena Instruction Following | — | 1437 |
Long Context Not comparable
Devstral 2: —, GPT-5.6 Luna: 43.9 (#82)
| Benchmark | Devstral 2 | GPT-5.6 Luna |
|---|---|---|
| LMArena Longer Query | — | 1436 |
Writing & Preference Not comparable
Devstral 2: —, GPT-5.6 Luna: 68.0 (#29)
| Benchmark | Devstral 2 | GPT-5.6 Luna |
|---|---|---|
| LMArena Text | — | 1431 |
| LMArena Creative Writing | — | 1396 |
| EQ-Bench Creative Writing | — | 1829 |
| EQ-Bench 4 | — | 1156 |
| LMArena Multi-Turn | — | 1434 |
Frequently asked questions
Is Devstral 2 better than GPT-5.6 Luna?
GPT-5.6 Luna has enough public results to be ranked (#30); Devstral 2 does not yet, so treat this comparison as directional.
Which is cheaper, Devstral 2 or GPT-5.6 Luna?
GPT-5.6 Luna is cheaper. It lists at $0.20 per million input tokens and $1.20 per million output tokens; Devstral 2 lists at $0.40 and $2.
Is Devstral 2 or GPT-5.6 Luna better for coding?
GPT-5.6 Luna scores higher on coding benchmarks: 54.5 versus 33.2 in the Noometry coding category.
Which has the bigger context window?
GPT-5.6 Luna does, with 1.05M tokens against 262K.
How many benchmarks do Devstral 2 and GPT-5.6 Luna share?
1 benchmark has published results for both models. Devstral 2 has 2 scored results on Noometry and GPT-5.6 Luna has 52.