# DeepSeek-V3.1-Terminus vs o3-pro

> DeepSeek-V3.1-Terminus and o3-pro score almost the same on the Noometry Index (42.6 vs 42.7), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/deepseek-v3-1-terminus-vs-o3-pro
- Last updated: 2026-10-10
- Shared benchmarks: 3

## Summary

- They share 3 benchmarks with published results for both. DeepSeek-V3.1-Terminus scores higher in 2 categories and o3-pro in 2 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in long context, where o3-pro leads 72.1 to 43.5.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 57.4% for DeepSeek-V3.1-Terminus and 72.1% for o3-pro.
- DeepSeek-V3.1-Terminus is cheaper at $0.30 / $1 per million input/output tokens, against $20 / $80 for o3-pro.
- o3-pro accepts more context: 200K tokens versus 164K.
- DeepSeek-V3.1-Terminus has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek-V3.1-Terminus | o3-pro |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Noometry Index | 42.6 | 42.7 |
| Rank | 96 | 94 |
| Context | 164K | 200K |
| Input $/M | $0.30 | $20 |
| Output $/M | $1 | $80 |
| Weights | Open | Proprietary |

## Coding

- DeepSeek-V3.1-Terminus: 41.5 (#114)
- o3-pro: 55.1 (#22)

| Benchmark | DeepSeek-V3.1-Terminus | o3-pro |
|---|---|---|
| Aider Polyglot | — | 84.9% |
| SciCode | 40.6% | — |
| WeirdML | — | 58.2% |
| LMArena Coding | 1426 | — |
| ALE-Bench | 745.17 | — |

## Reasoning

- DeepSeek-V3.1-Terminus: 25.7 (#126)
- o3-pro: 24.1 (#152)

| Benchmark | DeepSeek-V3.1-Terminus | o3-pro |
|---|---|---|
| Kagi LLM Benchmark | 57.4% | 72.1% |
| DTBench | 81.3% | 86.9% |
| LMCA | 28.6% | 38.5% |
| ARC-AGI-2 | — | 4.9% |
| ARC-AGI-1 | — | 59.3% |
| CritPt | 1.7% | — |
| LMArena Hard Prompts | 1427 | — |
| Epoch Capabilities Index | — | 147.43 |

## Math

- DeepSeek-V3.1-Terminus: 35.7 (#138)
- o3-pro: —

| Benchmark | DeepSeek-V3.1-Terminus | o3-pro |
|---|---|---|
| LMArena Math | 1402 | — |

## Knowledge

- DeepSeek-V3.1-Terminus: —
- o3-pro: 29.0 (#234)

| Benchmark | DeepSeek-V3.1-Terminus | o3-pro |
|---|---|---|
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |

## Multilingual

- DeepSeek-V3.1-Terminus: 52.3 (#87)
- o3-pro: —

| Benchmark | DeepSeek-V3.1-Terminus | o3-pro |
|---|---|---|
| LMArena Non-English | 1407 | — |
| LMArena Russian | 1434 | — |

## Instruction Following

- DeepSeek-V3.1-Terminus: 74.4 (#96)
- o3-pro: —

| Benchmark | DeepSeek-V3.1-Terminus | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1406 | — |

## Long Context

- DeepSeek-V3.1-Terminus: 43.5 (#88)
- o3-pro: 72.1 (#1)

| Benchmark | DeepSeek-V3.1-Terminus | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1426 | — |

## Writing & Preference

- DeepSeek-V3.1-Terminus: 61.3 (#87)
- o3-pro: 57.1 (#128)

| Benchmark | DeepSeek-V3.1-Terminus | o3-pro |
|---|---|---|
| LMArena Text | 1420 | — |
| LMArena Creative Writing | 1404 | — |
| Short-Story Creative Writing | — | 84.4% |
| LMArena Multi-Turn | 1411 | — |

## FAQ

### Is DeepSeek-V3.1-Terminus better than o3-pro?

DeepSeek-V3.1-Terminus and o3-pro score almost the same on the Noometry Index (42.6 vs 42.7), so choose on price, context window or the category you care about most.

### Which is cheaper, DeepSeek-V3.1-Terminus or o3-pro?

DeepSeek-V3.1-Terminus is cheaper. It lists at $0.30 per million input tokens and $1 per million output tokens; o3-pro lists at $20 and $80.

### Is DeepSeek-V3.1-Terminus or o3-pro better for coding?

o3-pro scores higher on coding benchmarks: 55.1 versus 41.5 in the Noometry coding category.

### Which has the bigger context window?

o3-pro does, with 200K tokens against 164K.

### How many benchmarks do DeepSeek-V3.1-Terminus and o3-pro share?

3 benchmarks have published results for both models. DeepSeek-V3.1-Terminus has 16 scored results on Noometry and o3-pro has 12.