Model comparison
GPT-5.3 Codex vs Qwen3.5 Plus
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 42.9 on the Noometry Index. Qwen3.5 Plus costs 5.3× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.
Last verified . 3 shared benchmarks.
Alibaba (Qwen)Summary
- They share 3 benchmarks with published results for both.
- Qwen3.5 Plus is cheaper at $0.40 / $2.40 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- Qwen3.5 Plus accepts more context: 1M tokens versus 400K.
Side by side
| GPT-5.3 Codex | Qwen3.5 Plus | |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 45.8 | 42.9 |
| Released | 2026-02-05 | 2026-02-16 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 1M |
| Max output | 128K | 66K |
| Input $ / M tokens | $1.75 | $0.40 |
| Output $ / M tokens | $14 | $2.40 |
| Results tracked | 8 | 15 |
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Category by category
Coding Not comparable
GPT-5.3 Codex: 48.6 (#56), Qwen3.5 Plus: —
| Benchmark | GPT-5.3 Codex | Qwen3.5 Plus |
|---|---|---|
| ALE-Bench | 1,655 | 621.92 |
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1409 | — |
| WeirdML | 79.3% | — |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 48.0 (#9), Qwen3.5 Plus: —
| Benchmark | GPT-5.3 Codex | Qwen3.5 Plus |
|---|---|---|
| Vending-Bench 2 | 5,940 | 0.54 |
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
Reasoning Not comparable
GPT-5.3 Codex: —, Qwen3.5 Plus: 32.8 (#74)
| Benchmark | GPT-5.3 Codex | Qwen3.5 Plus |
|---|---|---|
| Epoch Capabilities Index | 156.77 | 146.78 |
| Chess Puzzles | — | 22% |
| Mystery Game Puzzles | — | 17% |
| DTBench | — | 80.5% |
| LMCA | — | 36.4% |
Math Not comparable
GPT-5.3 Codex: —, Qwen3.5 Plus: 49.6 (#61)
| Benchmark | GPT-5.3 Codex | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 86.7% |
| FrontierMath (Feb 2025 set) | — | 21% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge Not comparable
GPT-5.3 Codex: —, Qwen3.5 Plus: 46.0 (#83)
| Benchmark | GPT-5.3 Codex | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | — | 84.8% |
| SimpleQA Verified | — | 25.4% |
| Vectara Hallucination Rate | — | 10.7% |
Long Context Not comparable
GPT-5.3 Codex: —, Qwen3.5 Plus: 43.0 (#113)
| Benchmark | GPT-5.3 Codex | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
Frequently asked questions
Is GPT-5.3 Codex better than Qwen3.5 Plus?
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 42.9 on the Noometry Index. Qwen3.5 Plus costs 5.3× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.
Which is cheaper, GPT-5.3 Codex or Qwen3.5 Plus?
Qwen3.5 Plus is cheaper. It lists at $0.40 per million input tokens and $2.40 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.
Which has the bigger context window?
Qwen3.5 Plus does, with 1M tokens against 400K.
How many benchmarks do GPT-5.3 Codex and Qwen3.5 Plus share?
3 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Qwen3.5 Plus has 15.