# GPT-5.1-Codex vs Qwen3-30B-A3B

> GPT-5.1-Codex and Qwen3-30B-A3B score almost the same on the Noometry Index (38.6 vs 38.9), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-qwen3-30b-a3b
- Last updated: 2026-10-12
- Shared benchmarks: 0

## Summary

- The widest gap is in agentic & tool use, where GPT-5.1-Codex leads 38.0 to 29.8.
- Qwen3-30B-A3B is cheaper at $0.12 / $0.50 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 41K.
- Qwen3-30B-A3B has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.1-Codex | Qwen3-30B-A3B |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 38.6 | 38.9 |
| Rank | 186 | 179 |
| Context | 400K | 41K |
| Input $/M | $1.25 | $0.12 |
| Output $/M | $10 | $0.50 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.1-Codex: 41.9 (#116)
- Qwen3-30B-A3B: 37.5 (#194)

| Benchmark | GPT-5.1-Codex | Qwen3-30B-A3B |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| SciCode | — | 33.3% |
| WeirdML | — | 29.8% |
| LMArena Coding | — | 1416 |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 38.0 (#33)
- Qwen3-30B-A3B: 29.8 (#82)

| Benchmark | GPT-5.1-Codex | Qwen3-30B-A3B |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| Berkeley Function Calling Leaderboard | — | 41.4% |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- Qwen3-30B-A3B: 22.2 (#204)

| Benchmark | GPT-5.1-Codex | Qwen3-30B-A3B |
|---|---|---|
| Kagi LLM Benchmark | — | 54.9% |
| CritPt | — | 0.3% |
| Chess Puzzles | — | 8% |
| LMArena Hard Prompts | — | 1398 |
| DTBench | — | 69.3% |
| LMCA | — | 22.4% |
| Epoch Capabilities Index | — | 139.63 |

## Math

- GPT-5.1-Codex: 30.3 (#235)
- Qwen3-30B-A3B: 37.4 (#157)

| Benchmark | GPT-5.1-Codex | Qwen3-30B-A3B |
|---|---|---|
| MathArena Final-Answer Competitions | — | 47.8% |
| OTIS Mock AIME 2024-2025 | — | 70.3% |
| ProofBench | 9% | — |
| LMArena Math | — | 1394 |

## Knowledge

- GPT-5.1-Codex: —
- Qwen3-30B-A3B: 41.8 (#105)

| Benchmark | GPT-5.1-Codex | Qwen3-30B-A3B |
|---|---|---|
| GPQA Diamond | — | 70.1% |
| Confabulations | — | 12.3% |
| LMArena Expert | — | 1396 |

## Multilingual

- GPT-5.1-Codex: —
- Qwen3-30B-A3B: 49.5 (#132)

| Benchmark | GPT-5.1-Codex | Qwen3-30B-A3B |
|---|---|---|
| LMArena Non-English | — | 1372 |
| LMArena Chinese | — | 1433 |
| LMArena French | — | 1418 |
| LMArena German | — | 1380 |
| LMArena Japanese | — | 1337 |
| LMArena Korean | — | 1331 |
| LMArena Russian | — | 1370 |
| LMArena Spanish | — | 1404 |

## Instruction Following

- GPT-5.1-Codex: —
- Qwen3-30B-A3B: 72.0 (#142)

| Benchmark | GPT-5.1-Codex | Qwen3-30B-A3B |
|---|---|---|
| LMArena Instruction Following | — | 1363 |

## Long Context

- GPT-5.1-Codex: —
- Qwen3-30B-A3B: 31.0 (#283)

| Benchmark | GPT-5.1-Codex | Qwen3-30B-A3B |
|---|---|---|
| Fiction.LiveBench | — | 40.6% |
| LMArena Longer Query | — | 1379 |

## Writing & Preference

- GPT-5.1-Codex: —
- Qwen3-30B-A3B: 55.6 (#143)

| Benchmark | GPT-5.1-Codex | Qwen3-30B-A3B |
|---|---|---|
| LMArena Text | — | 1384 |
| LMArena Creative Writing | — | 1317 |
| Short-Story Creative Writing | — | 75.3% |
| LMArena Multi-Turn | — | 1378 |

## FAQ

### Is GPT-5.1-Codex better than Qwen3-30B-A3B?

GPT-5.1-Codex and Qwen3-30B-A3B score almost the same on the Noometry Index (38.6 vs 38.9), so choose on price, context window or the category you care about most.

### Which is cheaper, GPT-5.1-Codex or Qwen3-30B-A3B?

Qwen3-30B-A3B is cheaper. It lists at $0.12 per million input tokens and $0.50 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.

### Is GPT-5.1-Codex or Qwen3-30B-A3B better for coding?

GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 37.5 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.1-Codex does, with 400K tokens against 41K.

### How many benchmarks do GPT-5.1-Codex and Qwen3-30B-A3B share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Qwen3-30B-A3B has 32.