# GPT-5-Codex vs Qwen3 8B

> GPT-5-Codex is the stronger model overall, scoring 37.3 to 33.3 on the Noometry Index. Qwen3 8B costs 11× less per token, which makes it the better buy when GPT-5-Codex's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-codex-vs-qwen3-8b
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where GPT-5-Codex leads 30.0 to 16.1.
- Qwen3 8B is cheaper at $0.18 / $0.70 per million input/output tokens, against $1.25 / $10 for GPT-5-Codex.
- GPT-5-Codex accepts more context: 400K tokens versus 131K.
- Qwen3 8B has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5-Codex | Qwen3 8B |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 37.3 | 33.3 |
| Rank | 190 | 237 |
| Context | 400K | 131K |
| Input $/M | $1.25 | $0.18 |
| Output $/M | $10 | $0.70 |
| Weights | Proprietary | Open |

## Coding

- GPT-5-Codex: 41.9 (#100)
- Qwen3 8B: 33.4 (#245)

| Benchmark | GPT-5-Codex | Qwen3 8B |
|---|---|---|
| SciCode | — | 22.6% |
| WeirdML | 54.5% | — |

## Agentic & Tool Use

- GPT-5-Codex: 30.8 (#66)
- Qwen3 8B: 29.9 (#71)

| Benchmark | GPT-5-Codex | Qwen3 8B |
|---|---|---|
| Terminal-Bench | 44.3% | — |
| Berkeley Function Calling Leaderboard | — | 42.6% |

## Reasoning

- GPT-5-Codex: 30.0 (#80)
- Qwen3 8B: 16.1 (#299)

| Benchmark | GPT-5-Codex | Qwen3 8B |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| CritPt | — | 0% |
| Chess Puzzles | — | 5% |
| DTBench | — | 59.7% |
| LMCA | — | 8.8% |
| Epoch Capabilities Index | — | 136.17 |

## Math

- GPT-5-Codex: —
- Qwen3 8B: 33.3 (#176)

| Benchmark | GPT-5-Codex | Qwen3 8B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 56.1% |

## Knowledge

- GPT-5-Codex: —
- Qwen3 8B: 36.1 (#164)

| Benchmark | GPT-5-Codex | Qwen3 8B |
|---|---|---|
| GPQA Diamond | — | 56.8% |
| Vectara Hallucination Rate | — | 4.8% |

## Long Context

- GPT-5-Codex: —
- Qwen3 8B: 37.8 (#205)

| Benchmark | GPT-5-Codex | Qwen3 8B |
|---|---|---|
| Fiction.LiveBench | — | 62.1% |

## FAQ

### Is GPT-5-Codex better than Qwen3 8B?

GPT-5-Codex is the stronger model overall, scoring 37.3 to 33.3 on the Noometry Index. Qwen3 8B costs 11× less per token, which makes it the better buy when GPT-5-Codex's lead doesn't matter for your workload.

### Which is cheaper, GPT-5-Codex or Qwen3 8B?

Qwen3 8B is cheaper. It lists at $0.18 per million input tokens and $0.70 per million output tokens; GPT-5-Codex lists at $1.25 and $10.

### Is GPT-5-Codex or Qwen3 8B better for coding?

GPT-5-Codex scores higher on coding benchmarks: 41.9 versus 33.4 in the Noometry coding category.

### Which has the bigger context window?

GPT-5-Codex does, with 400K tokens against 131K.

### How many benchmarks do GPT-5-Codex and Qwen3 8B share?

0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Qwen3 8B has 11.