Model comparison
GPT-5.1-Codex vs Qwen3.6 Flash
GPT-5.1-Codex and Qwen3.6 Flash score almost the same on the Noometry Index (38.6 vs 38.8), so choose on price, context window or the category you care about most.
Last verified . 1 shared benchmarks.
Alibaba (Qwen)Summary
- They share 1 benchmark with published results for both. GPT-5.1-Codex scores higher in 0 categories and Qwen3.6 Flash in 1 category; one gap is clear of the uncertainty.
- The widest gap is in math, where Qwen3.6 Flash leads 39.0 to 30.3.
- Qwen3.6 Flash is cheaper at $0.19 / $1.13 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- Qwen3.6 Flash accepts more context: 1M tokens versus 400K.
Side by side
| GPT-5.1-Codex | Qwen3.6 Flash | |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 38.6 | 38.8 |
| Released | 2025-11-12 | 2026-04-27 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 1M |
| Max output | 128K | 66K |
| Input $ / M tokens | $1.25 | $0.19 |
| Output $ / M tokens | $10 | $1.13 |
| Results tracked | 6 | 13 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Not comparable
GPT-5.1-Codex: 41.9 (#116), Qwen3.6 Flash: —
| Benchmark | GPT-5.1-Codex | Qwen3.6 Flash |
|---|---|---|
| ALE-Bench | 1,245 | 326.4 |
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
Agentic & Tool Use Not comparable
GPT-5.1-Codex: 38.0 (#33), Qwen3.6 Flash: —
| Benchmark | GPT-5.1-Codex | Qwen3.6 Flash |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Qwen3.6 Flash: 29.0 (#96)
| Benchmark | GPT-5.1-Codex | Qwen3.6 Flash |
|---|---|---|
| SimpleBench | — | 35.2% |
| Chess Puzzles | — | 20% |
| Mystery Game Puzzles | — | 18% |
| DTBench | — | 77.1% |
| LMCA | — | 31% |
| Epoch Capabilities Index | — | 143.26 |
Math Qwen3.6 Flash leads
GPT-5.1-Codex: 30.3 (#235), Qwen3.6 Flash: 39.0 (#117)
| Benchmark | GPT-5.1-Codex | Qwen3.6 Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 22.5% |
| OTIS Mock AIME 2024-2025 | — | 84.4% |
| ProofBench | 9% | — |
| FrontierMath (Feb 2025 set) | — | 10.3% |
| FrontierMath Tier 4 (v1) | — | 0% |
Knowledge Not comparable
GPT-5.1-Codex: —, Qwen3.6 Flash: 42.1 (#100)
| Benchmark | GPT-5.1-Codex | Qwen3.6 Flash |
|---|---|---|
| GPQA Diamond | — | 83.3% |
| SimpleQA Verified | — | 15.9% |
Frequently asked questions
Is GPT-5.1-Codex better than Qwen3.6 Flash?
GPT-5.1-Codex and Qwen3.6 Flash score almost the same on the Noometry Index (38.6 vs 38.8), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-5.1-Codex or Qwen3.6 Flash?
Qwen3.6 Flash is cheaper. It lists at $0.19 per million input tokens and $1.13 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Which has the bigger context window?
Qwen3.6 Flash does, with 1M tokens against 400K.
How many benchmarks do GPT-5.1-Codex and Qwen3.6 Flash share?
1 benchmark has published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Qwen3.6 Flash has 13.