# Devstral 2 vs GPT-5.6 Terra

> GPT-5.6 Terra has enough public results to be ranked (#17); Devstral 2 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/devstral-2-vs-gpt-5-6-terra
- Last updated: 2026-10-11
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Devstral 2 scores higher in 0 categories and GPT-5.6 Terra in 1 category; one gap is clear of the uncertainty.
- The widest gap is in coding, where GPT-5.6 Terra leads 57.7 to 33.2.
- Devstral 2 is cheaper at $0.40 / $2 per million input/output tokens, against $2 / $12 for GPT-5.6 Terra.
- GPT-5.6 Terra accepts more context: 1.05M tokens versus 262K.
- Devstral 2 has downloadable open weights; the other is API-only.

## Snapshot

| | Devstral 2 | GPT-5.6 Terra |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Noometry Index | 36.1 | 59.2 |
| Rank | — | 17 |
| Context | 262K | 1.05M |
| Input $/M | $0.40 | $2 |
| Output $/M | $2 | $12 |
| Weights | Open | Proprietary |

## Coding

- Devstral 2: 33.2 (#261)
- GPT-5.6 Terra: 57.7 (#19)

| Benchmark | Devstral 2 | GPT-5.6 Terra |
|---|---|---|
| LMArena WebDev | 1197 | 1522 |
| DeepSWE | — | 69.6% |
| FrontierCode | — | 41.3% |
| SWE-bench Verified (bash only) | 53.8% | — |
| CursorBench | — | 41.3% |
| SciCode | — | 55% |
| WeirdML | — | 78.3% |
| LMArena Coding | — | 1484 |
| ALE-Bench | — | 1,951 |

## Agentic & Tool Use

- Devstral 2: —
- GPT-5.6 Terra: 40.1 (#25)

| Benchmark | Devstral 2 | GPT-5.6 Terra |
|---|---|---|
| APEX-Agents | — | 58.2% |
| BALROG | — | 53.2% |
| GDP.pdf | — | 24.7% |
| Vending-Bench 2 | — | 7,343 |

## Reasoning

- Devstral 2: —
- GPT-5.6 Terra: 60.7 (#21)

| Benchmark | Devstral 2 | GPT-5.6 Terra |
|---|---|---|
| ARC-AGI-2 | — | 83.9% |
| SimpleBench | — | 48.9% |
| Kagi LLM Benchmark | — | 51.3% |
| NYT Connections (extended) | — | 78.4% |
| ARC-AGI-1 | — | 96.5% |
| CritPt | — | 30% |
| Chess Puzzles | — | 54% |
| LMArena Hard Prompts | — | 1468 |
| Mystery Game Puzzles | — | 35% |
| DTBench | — | 93.3% |
| LMCA | — | 55% |
| Surface Evolver Bench | — | 83.8% |
| Epoch Capabilities Index | — | 159.62 |

## Math

- Devstral 2: —
- GPT-5.6 Terra: 81.6 (#12)

| Benchmark | Devstral 2 | GPT-5.6 Terra |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 86% |
| FrontierMath Tier 4 | — | 70.7% |
| OTIS Mock AIME 2024-2025 | — | 99.7% |
| ProofBench | — | 74% |
| LMArena Math | — | 1466 |

## Knowledge

- Devstral 2: —
- GPT-5.6 Terra: 61.2 (#30)

| Benchmark | Devstral 2 | GPT-5.6 Terra |
|---|---|---|
| GPQA Diamond | — | 93.3% |
| SimpleQA Verified | — | 43.2% |
| LMArena Expert | — | 1492 |

## Multimodal

- Devstral 2: —
- GPT-5.6 Terra: 47.3 (#11)

| Benchmark | Devstral 2 | GPT-5.6 Terra |
|---|---|---|
| LMArena Vision | — | 1271 |
| Blueprint-Bench 2 | — | 30.8% |
| Furniture Assembly | — | 54.2% |
| LMArena Document | — | 1472 |

## Multilingual

- Devstral 2: —
- GPT-5.6 Terra: 54.4 (#44)

| Benchmark | Devstral 2 | GPT-5.6 Terra |
|---|---|---|
| LMArena Non-English | — | 1439 |
| LMArena Chinese | — | 1513 |
| LMArena French | — | 1471 |
| LMArena German | — | 1460 |
| LMArena Japanese | — | 1457 |
| LMArena Korean | — | 1425 |
| LMArena Russian | — | 1450 |
| LMArena Spanish | — | 1448 |

## Instruction Following

- Devstral 2: —
- GPT-5.6 Terra: 76.4 (#40)

| Benchmark | Devstral 2 | GPT-5.6 Terra |
|---|---|---|
| LMArena Instruction Following | — | 1454 |

## Long Context

- Devstral 2: —
- GPT-5.6 Terra: 44.4 (#68)

| Benchmark | Devstral 2 | GPT-5.6 Terra |
|---|---|---|
| LMArena Longer Query | — | 1451 |

## Writing & Preference

- Devstral 2: —
- GPT-5.6 Terra: 70.2 (#23)

| Benchmark | Devstral 2 | GPT-5.6 Terra |
|---|---|---|
| LMArena Text | — | 1447 |
| LMArena Creative Writing | — | 1410 |
| EQ-Bench Creative Writing | — | 1855 |
| EQ-Bench 4 | — | 1234 |
| LMArena Multi-Turn | — | 1449 |

## FAQ

### Is Devstral 2 better than GPT-5.6 Terra?

GPT-5.6 Terra has enough public results to be ranked (#17); Devstral 2 does not yet, so treat this comparison as directional.

### Which is cheaper, Devstral 2 or GPT-5.6 Terra?

Devstral 2 is cheaper. It lists at $0.40 per million input tokens and $2 per million output tokens; GPT-5.6 Terra lists at $2 and $12.

### Is Devstral 2 or GPT-5.6 Terra better for coding?

GPT-5.6 Terra scores higher on coding benchmarks: 57.7 versus 33.2 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.6 Terra does, with 1.05M tokens against 262K.

### How many benchmarks do Devstral 2 and GPT-5.6 Terra share?

1 benchmark has published results for both models. Devstral 2 has 2 scored results on Noometry and GPT-5.6 Terra has 52.