Model comparison
GPT-5.1-Codex vs Qwen3 8B
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 33.7 on the Noometry Index. Qwen3 8B costs 11× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Alibaba (Qwen)Summary
- The widest gap is in coding, where GPT-5.1-Codex leads 41.9 to 34.0.
- Qwen3 8B is cheaper at $0.18 / $0.70 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 131K.
- Qwen3 8B has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | Qwen3 8B | |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 38.6 | 33.7 |
| Released | 2025-11-12 | 2025-04 |
| Weights | Proprietary | Open |
| Context window | 400K | 131K |
| Max output | 128K | 8K |
| Input $ / M tokens | $1.25 | $0.18 |
| Output $ / M tokens | $10 | $0.70 |
| Results tracked | 6 | 11 |
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Category by category
Coding GPT-5.1-Codex leads
GPT-5.1-Codex: 41.9 (#116), Qwen3 8B: 34.0 (#248)
| Benchmark | GPT-5.1-Codex | Qwen3 8B |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| SciCode | — | 22.6% |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use GPT-5.1-Codex leads
GPT-5.1-Codex: 38.0 (#33), Qwen3 8B: 30.2 (#78)
| Benchmark | GPT-5.1-Codex | Qwen3 8B |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| Berkeley Function Calling Leaderboard | — | 42.6% |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Qwen3 8B: 16.6 (#303)
| Benchmark | GPT-5.1-Codex | Qwen3 8B |
|---|---|---|
| CritPt | — | 0% |
| Chess Puzzles | — | 5% |
| DTBench | — | 59.7% |
| LMCA | — | 8.8% |
| Epoch Capabilities Index | — | 136.17 |
Math Qwen3 8B leads
GPT-5.1-Codex: 30.3 (#235), Qwen3 8B: 34.9 (#191)
| Benchmark | GPT-5.1-Codex | Qwen3 8B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 56.1% |
| ProofBench | 9% | — |
Knowledge Not comparable
GPT-5.1-Codex: —, Qwen3 8B: 36.1 (#173)
| Benchmark | GPT-5.1-Codex | Qwen3 8B |
|---|---|---|
| GPQA Diamond | — | 56.8% |
| Vectara Hallucination Rate | — | 4.8% |
Long Context Not comparable
GPT-5.1-Codex: —, Qwen3 8B: 37.9 (#210)
| Benchmark | GPT-5.1-Codex | Qwen3 8B |
|---|---|---|
| Fiction.LiveBench | — | 62.1% |
Frequently asked questions
Is GPT-5.1-Codex better than Qwen3 8B?
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 33.7 on the Noometry Index. Qwen3 8B costs 11× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.
Which is cheaper, GPT-5.1-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-5.1-Codex lists at $1.25 and $10.
Is GPT-5.1-Codex or Qwen3 8B better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 34.0 in the Noometry coding category.
Which has the bigger context window?
GPT-5.1-Codex does, with 400K tokens against 131K.
How many benchmarks do GPT-5.1-Codex and Qwen3 8B share?
0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Qwen3 8B has 11.