Model Comparison
GPT-5.5 (Non-reasoning)
vs. o3
Comparing 2 AI models · 12 benchmarks · OpenAI
Recommended Pick
Op o3 11 metric wins Strongest on: Value, Input price, Output price
Best Value
o3
100.0 value score
72.5 reasoning / $3.50/1M
Lowest Price
o3
$2.00/1M input price
Best Reasoning
o3
72.5 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.5 (Non-reasoning)
48.6 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
o3 has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
o3 is 2.5x cheaper on input tokens than GPT-5.5 (Non-reasoning).
Speed gap
o3 generates about 2.3x as many tokens per second as GPT-5.5 (Non-reasoning).
Reasoning gap
o3 leads GPT-5.5 (Non-reasoning) by 29.0 points on reasoning.
Coding gap
GPT-5.5 (Non-reasoning) leads o3 by 10.2 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GPT-5.5 (Non-reasoning)
OpenAI
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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o3
OpenAI
TTFT
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Time
—
tok/s
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Tokens
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Cost
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Which answer was more useful?
Full Comparison
| Metric | Op GPT-5.5 (Non-reasoning) | Top Pick Op o3 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $5.00/1M | $2.00/1M |
| Output Cost | $30.00/1M | $8.00/1M |
| Blended (3:1) | $11.25/1M | $3.50/1M |
| Specifications | ||
| Organization | OpenAI | OpenAI |
| Release Date | Apr 23, 2026 | Apr 16, 2025 |
| Performance & Speed | ||
| Throughput | 54.0 tok/s | 121.8 tok/s |
| TTFT | 1007ms | 5908ms |
| Latency | 1007ms | 5908ms |
| Composite Indices | ||
| Value Score | 18.6 | 100.0 |
| Reasoning Score | 43.4 | 72.5 |
| Intelligence | 40.9 | 38.4 |
| Coding | 48.6 | 38.4 |
| Math | — | 88.3 |
| Standard Benchmarks | ||
| GPQA | 76.8% | 82.7% |
| MMLU Pro | — | 85.3% |
| HLE | 12.6% | 20.0% |
| LiveCodeBench | — | 80.8% |
| MATH 500 | — | 99.2% |
| AIME 2025 | — | 88.3% |
| AIME (Original) | — | 90.3% |
| SciCode | 47.3% | 41.0% |
| LCR | 56.3% | 69.3% |
| IFBench | 46.1% | 71.4% |
| TAU-bench v2 | 69.3% | 80.7% |
| TerminalBench Hard | 49.2% | 37.1% |
Key Takeaways
o3 offers the best value at $2.00/1M, making it ideal for high-volume applications and cost-conscious projects.
o3 has the strongest reasoning profile with a 72.5 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5.5 (Non-reasoning) reaches a 48.6 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
GPT-5.5 (Non-reasoning)
- Code generation
- Software development
o3
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
