Model Comparison
Devstral 2
vs. GPT-5.5 (xhigh)
Comparing 2 AI models · 10 benchmarks · Mistral, OpenAI
Recommended Pick
Op GPT-5.5 (xhigh) 11 metric wins Strongest on: Throughput, Reasoning, Intelligence
Lowest Price
Devstral 2
$0.00/1M 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
Price gap
Devstral 2 is ∞x cheaper on input tokens than GPT-5.5 (xhigh).
Speed gap
GPT-5.5 (xhigh) generates about 1.7x as many tokens per second as Devstral 2.
Reasoning gap
GPT-5.5 (xhigh) leads Devstral 2 by 34.3 points on reasoning.
Coding gap
GPT-5.5 (xhigh) leads Devstral 2 by 35.4 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.
Devstral 2
Mistral
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 | Mi Devstral 2 | Top Pick Op GPT-5.5 (xhigh) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.00/1M | $5.00/1M |
| Output Cost | $0.00/1M | $30.00/1M |
| Blended (3:1) | — | $11.25/1M |
| Specifications | ||
| Organization | Mistral | OpenAI |
| Release Date | Dec 9, 2025 | Apr 23, 2026 |
| Performance & Speed | ||
| Throughput | 42.3 tok/s | 70.7 tok/s |
| TTFT | 633ms | 43393ms |
| Latency | 633ms | 43393ms |
| Composite Indices | ||
| Value Score | — | 100.0 |
| Reasoning Score | 31.7 | 66.0 |
| Intelligence | 22.0 | 60.2 |
| Coding | 23.7 | 59.1 |
| Math | 36.7 | — |
| Standard Benchmarks | ||
| GPQA | 59.4% | 93.5% |
| MMLU Pro | 76.2% | — |
| HLE | 3.6% | 44.3% |
| LiveCodeBench | 44.8% | — |
| AIME 2025 | 36.7% | — |
| SciCode | 33.1% | 56.1% |
| LCR | 30.0% | 74.3% |
| IFBench | 38.1% | 75.9% |
| TAU-bench v2 | 24.9% | 93.9% |
| TerminalBench Hard | 18.9% | 60.6% |
Key Takeaways
Devstral 2 offers the best value at $0.00/1M, 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
Devstral 2
- Cost-sensitive applications
- High-volume processing
GPT-5.5 (xhigh)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
