Model Comparison
Apertus 70B Instruct
vs. GPT-5.5 (xhigh)
Comparing 2 AI models · 7 benchmarks · Swiss AI Initiative, OpenAI
Recommended Pick
Op GPT-5.5 (xhigh) 11 metric wins Strongest on: Throughput, Reasoning, Intelligence
Best Value
Apertus 70B Instruct
100.0 value score
13.5 reasoning / $1.34/1M
Lowest Price
Apertus 70B Instruct
$0.82/1M input price
Best Reasoning
GPT-5.5 (xhigh)
66.0 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.5 (xhigh)
59.1 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
Apertus 70B Instruct has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Apertus 70B Instruct is 6.1x cheaper on input tokens than GPT-5.5 (xhigh).
Reasoning gap
GPT-5.5 (xhigh) leads Apertus 70B Instruct by 52.5 points on reasoning.
Coding gap
GPT-5.5 (xhigh) leads Apertus 70B Instruct by 57.2 points on coding.
Top-pick rationale
GPT-5.5 (xhigh) wins 11 measurable categories, including Throughput, Reasoning, Intelligence, Coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Apertus 70B Instruct
Swiss AI Initiative
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
GPT-5.5 (xhigh)
OpenAI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | Sw Apertus 70B Instruct | Top Pick Op GPT-5.5 (xhigh) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.82/1M | $5.00/1M |
| Output Cost | $2.92/1M | $30.00/1M |
| Blended (3:1) | $1.34/1M | $11.25/1M |
| Specifications | ||
| Organization | Swiss AI Initiative | OpenAI |
| Release Date | Sep 2, 2025 | Apr 23, 2026 |
| Performance & Speed | ||
| Throughput | — | 62.4 tok/s |
| TTFT | — | 84682ms |
| Latency | — | 84682ms |
| Composite Indices | ||
| Value Score | 100.0 | 58.6 |
| Reasoning Score | 13.5 | 66.0 |
| Intelligence | 7.7 | 60.2 |
| Coding | 1.9 | 59.1 |
| Standard Benchmarks | ||
| GPQA | 27.2% | 93.5% |
| HLE | 5.5% | 44.3% |
| SciCode | 5.7% | 56.1% |
| LCR | 0.0% | 74.3% |
| IFBench | 25.9% | 75.9% |
| TAU-bench v2 | 12.9% | 93.9% |
| TerminalBench Hard | 0.0% | 60.6% |
Key Takeaways
Apertus 70B Instruct offers the best value at $0.82/1M, making it ideal for high-volume applications and cost-conscious projects.
GPT-5.5 (xhigh) has the strongest reasoning profile with a 66.0 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5.5 (xhigh) reaches a 59.1 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
Apertus 70B Instruct
- Cost-sensitive applications
- High-volume processing
GPT-5.5 (xhigh)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
