# GPT-5.1-Codex vs Qwen3-4B

> GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 31.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-qwen3-4b
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in agentic & tool use, where GPT-5.1-Codex leads 37.8 to 27.3.
- Qwen3-4B has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.1-Codex | Qwen3-4B |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 38.2 | 31.5 |
| Rank | 178 | 261 |
| Context | 400K | — |
| Input $/M | $1.25 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- Qwen3-4B: —

| Benchmark | GPT-5.1-Codex | Qwen3-4B |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- Qwen3-4B: 27.3 (#94)

| Benchmark | GPT-5.1-Codex | Qwen3-4B |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| Berkeley Function Calling Leaderboard | — | 35.7% |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- Qwen3-4B: 18.5 (#264)

| Benchmark | GPT-5.1-Codex | Qwen3-4B |
|---|---|---|
| Chess Puzzles | — | 4% |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- Qwen3-4B: 28.5 (#228)

| Benchmark | GPT-5.1-Codex | Qwen3-4B |
|---|---|---|
| MathArena Final-Answer Competitions | — | 38.5% |
| OTIS Mock AIME 2024-2025 | — | 52.2% |
| ProofBench | 9% | — |

## Knowledge

- GPT-5.1-Codex: —
- Qwen3-4B: 33.0 (#198)

| Benchmark | GPT-5.1-Codex | Qwen3-4B |
|---|---|---|
| GPQA Diamond | — | 52.3% |
| Vectara Hallucination Rate | — | 5.7% |

## FAQ

### Is GPT-5.1-Codex better than Qwen3-4B?

GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 31.5 on the Noometry Index.

### How many benchmarks do GPT-5.1-Codex and Qwen3-4B share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Qwen3-4B has 6.