Model comparison
Mercury 2.5 vs Qwen3.5 Plus
Qwen3.5 Plus has enough public results to be ranked (#103); Mercury 2.5 does not yet, so treat this comparison as directional.
Last verified . 1 shared benchmarks.
Alibaba (Qwen)Summary
- They share 1 benchmark with published results for both. Mercury 2.5 scores higher in 0 categories and Qwen3.5 Plus in 1 category; one gap is clear of the uncertainty.
- The widest gap is in math, where Qwen3.5 Plus leads 47.9 to 22.4.
- Mercury 2.5 is cheaper at $0.04 / $0.15 per million input/output tokens, against $0.40 / $2.40 for Qwen3.5 Plus.
- Qwen3.5 Plus accepts more context: 1M tokens versus 260K.
Side by side
| Mercury 2.5 | Qwen3.5 Plus | |
|---|---|---|
| Provider | Inception | Alibaba (Qwen) |
| Noometry Index | 30.2 | 42.3 |
| Released | 2026-09-08 | 2026-02-16 |
| Weights | Proprietary | Proprietary |
| Context window | 260K | 1M |
| Max output | 66K | 66K |
| Input $ / M tokens | $0.04 | $0.40 |
| Output $ / M tokens | $0.15 | $2.40 |
| Results tracked | 2 | 15 |
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Category by category
Coding Not comparable
Mercury 2.5: —, Qwen3.5 Plus: —
| Benchmark | Mercury 2.5 | Qwen3.5 Plus |
|---|---|---|
| ALE-Bench | 301.65 | 621.92 |
Agentic & Tool Use Not comparable
Mercury 2.5: —, Qwen3.5 Plus: —
| Benchmark | Mercury 2.5 | Qwen3.5 Plus |
|---|---|---|
| Vending-Bench 2 | — | 0.54 |
Reasoning Not comparable
Mercury 2.5: —, Qwen3.5 Plus: 32.0 (#67)
| Benchmark | Mercury 2.5 | Qwen3.5 Plus |
|---|---|---|
| Chess Puzzles | — | 22% |
| Mystery Game Puzzles | — | 17% |
| DTBench | — | 80.5% |
| LMCA | — | 36.4% |
| Epoch Capabilities Index | — | 146.79 |
Math Qwen3.5 Plus leads
Mercury 2.5: 22.4, Qwen3.5 Plus: 47.9 (#55)
| Benchmark | Mercury 2.5 | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 86.7% |
| ProofBench | 3% | — |
| FrontierMath (Feb 2025 set) | — | 21% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge Not comparable
Mercury 2.5: —, Qwen3.5 Plus: 46.0 (#78)
| Benchmark | Mercury 2.5 | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | — | 84.8% |
| SimpleQA Verified | — | 25.4% |
| Vectara Hallucination Rate | — | 10.7% |
Long Context Not comparable
Mercury 2.5: —, Qwen3.5 Plus: 42.9 (#109)
| Benchmark | Mercury 2.5 | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
Frequently asked questions
Is Mercury 2.5 better than Qwen3.5 Plus?
Qwen3.5 Plus has enough public results to be ranked (#103); Mercury 2.5 does not yet, so treat this comparison as directional.
Which is cheaper, Mercury 2.5 or Qwen3.5 Plus?
Mercury 2.5 is cheaper. It lists at $0.04 per million input tokens and $0.15 per million output tokens; Qwen3.5 Plus lists at $0.40 and $2.40.
Which has the bigger context window?
Qwen3.5 Plus does, with 1M tokens against 260K.
How many benchmarks do Mercury 2.5 and Qwen3.5 Plus share?
1 benchmark has published results for both models. Mercury 2.5 has 2 scored results on Noometry and Qwen3.5 Plus has 15.