Model Comparison
Qwen3.5 2B (Reasoning)
vs. Tri-21B-think Preview
Comparing 2 AI models · 7 benchmarks · Alibaba, Trillion Labs
Recommended Pick
TrTri-21B-think Preview7 metric winsStrongest on: Reasoning, Intelligence, GPQA
Lowest Price
Qwen3.5 2B (Reasoning)
$0.00/1M input price
Best Reasoning
Tri-21B-think Preview
24.4 reasoning score
Blends available reasoning benchmarks
Best for Coding
Qwen3.5 2B (Reasoning)
2.9 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Reasoning gap
Tri-21B-think Preview leads Qwen3.5 2B (Reasoning) by 5.9 points on reasoning.
Top-pick rationale
Tri-21B-think Preview wins 7 measurable categories, including Reasoning, Intelligence, GPQA, HLE.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Qwen3.5 2B (Reasoning)
Alibaba
TTFT
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Time
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tok/s
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Tokens
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Cost
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Tri-21B-think Preview
Trillion Labs
TTFT
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Time
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tok/s
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Tokens
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Cost
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Which answer was more useful?
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Full Comparison
| Metric | Al Qwen3.5 2B (Reasoning) | Top Pick Tr Tri-21B-think Preview |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.00/1M | $0.00/1M |
| Output Cost | $0.00/1M | $0.00/1M |
| Specifications | ||
| Organization | Alibaba | Trillion Labs |
| Release Date | Mar 2, 2026 | Feb 10, 2026 |
| Performance & Speed | ||
| Throughput | — | — |
| TTFT | — | — |
| Latency | — | — |
| Composite Indices | ||
| Reasoning Score | 18.4 | 24.4 |
| Intelligence | 7.6 | 13.6 |
| Coding | 2.9 | — |
| Standard Benchmarks | ||
| GPQA | 45.6% | 53.8% |
| HLE | 2.1% | 5.7% |
| SciCode | 2.8% | 17.8% |
| LCR | 23.7% | 14.7% |
| IFBench | 31.5% | 47.1% |
| TAU-bench v2 | 69.0% | 93.3% |
| TerminalBench Hard | 3.8% | 2.3% |
Key Takeaways
Qwen3.5 2B (Reasoning) offers the best value at $0.00/1M,making it ideal for high-volume applications and cost-conscious projects.
Tri-21B-think Preview has the strongest reasoning profile with a 24.4 reasoning score,combining the available reasoning-heavy benchmarks.
Qwen3.5 2B (Reasoning) reaches a 2.9 coding index,making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens,suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Qwen3.5 2B (Reasoning)
- Cost-sensitive applications
- High-volume processing
- Code generation
- Software development
Tri-21B-think Preview
- Complex reasoning tasks
- Research & analysis
