# Dolly 2.0-12b vs GPT-5.1-Codex

> GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 24.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/dolly-2-0-12b-vs-gpt-5-1-codex
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5.1-Codex leads 41.7 to 23.0.
- Dolly 2.0-12b has downloadable open weights; the other is API-only.

## Snapshot

| | Dolly 2.0-12b | GPT-5.1-Codex |
|---|---|---|
| Provider | Databricks | OpenAI |
| Noometry Index | 24.9 | 38.2 |
| Rank | 339 | 178 |
| Context | — | 400K |
| Input $/M | — | $1.25 |
| Output $/M | — | $10 |
| Weights | Open | Proprietary |

## Coding

- Dolly 2.0-12b: 23.0 (#327)
- GPT-5.1-Codex: 41.7 (#107)

| Benchmark | Dolly 2.0-12b | GPT-5.1-Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 66% |
| LMArena WebDev | — | 1337 |
| LMArena Coding | 776 | — |
| ALE-Bench | — | 1,245 |

## Agentic & Tool Use

- Dolly 2.0-12b: —
- GPT-5.1-Codex: 37.8 (#32)

| Benchmark | Dolly 2.0-12b | GPT-5.1-Codex |
|---|---|---|
| Terminal-Bench | — | 60.4% |
| METR Time Horizons | — | 70.8% |

## Reasoning

- Dolly 2.0-12b: 14.6 (#315)
- GPT-5.1-Codex: —

| Benchmark | Dolly 2.0-12b | GPT-5.1-Codex |
|---|---|---|
| LMArena Hard Prompts | 804 | — |
| Epoch Capabilities Index | 88.94 | — |
| HellaSwag | 70.8% | — |
| PIQA | 75.4% | — |
| WinoGrande | 61.8% | — |

## Math

- Dolly 2.0-12b: 25.0 (#250)
- GPT-5.1-Codex: 29.3 (#218)

| Benchmark | Dolly 2.0-12b | GPT-5.1-Codex |
|---|---|---|
| ProofBench | — | 9% |
| LMArena Math | 871 | — |

## Knowledge

- Dolly 2.0-12b: —
- GPT-5.1-Codex: —

| Benchmark | Dolly 2.0-12b | GPT-5.1-Codex |
|---|---|---|
| ARC (AI2) Challenge | 39.6% | — |
| BoolQ | 56.3% | — |
| MMLU | 26.2% | — |
| OpenBookQA | 39.2% | — |

## Multilingual

- Dolly 2.0-12b: 17.4 (#291)
- GPT-5.1-Codex: —

| Benchmark | Dolly 2.0-12b | GPT-5.1-Codex |
|---|---|---|
| LMArena Non-English | 836 | — |
| LMArena Chinese | 836 | — |

## Instruction Following

- Dolly 2.0-12b: 38.9 (#299)
- GPT-5.1-Codex: —

| Benchmark | Dolly 2.0-12b | GPT-5.1-Codex |
|---|---|---|
| LMArena Instruction Following | 814 | — |

## Writing & Preference

- Dolly 2.0-12b: 15.3 (#306)
- GPT-5.1-Codex: —

| Benchmark | Dolly 2.0-12b | GPT-5.1-Codex |
|---|---|---|
| LMArena Text | 851 | — |
| LMArena Creative Writing | 864 | — |
| LMArena Multi-Turn | 740 | — |

## FAQ

### Is Dolly 2.0-12b better than GPT-5.1-Codex?

GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 24.9 on the Noometry Index.

### Is Dolly 2.0-12b or GPT-5.1-Codex better for coding?

GPT-5.1-Codex scores higher on coding benchmarks: 41.7 versus 23.0 in the Noometry coding category.

### How many benchmarks do Dolly 2.0-12b and GPT-5.1-Codex share?

0 benchmarks have published results for both models. Dolly 2.0-12b has 17 scored results on Noometry and GPT-5.1-Codex has 6.