Model Comparison
GPT-5.5 (high)
vs. GPT-5.5 (medium)
Comparing 2 AI models · 7 benchmarks · OpenAI
Recommended Pick
Op GPT-5.5 (high) 12 metric wins Strongest on: Value, Throughput, Reasoning
Best Value
GPT-5.5 (high)
100.0 value score
65.0 reasoning / $11.25/1M
Lowest Price
GPT-5.5 (high)
$5.00/1M input price
Best Reasoning
GPT-5.5 (high)
65.0 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.5 (high)
58.5 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
GPT-5.5 (high) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Speed gap
GPT-5.5 (high) generates about 1.1x as many tokens per second as GPT-5.5 (medium).
Reasoning gap
GPT-5.5 (high) leads GPT-5.5 (medium) by 1.7 points on reasoning.
Coding gap
GPT-5.5 (high) leads GPT-5.5 (medium) by 2.3 points on coding.
Top-pick rationale
GPT-5.5 (high) wins 12 measurable categories, including Value, Throughput, Reasoning, Intelligence.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GPT-5.5 (high)
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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GPT-5.5 (medium)
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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Which answer was more useful?
Full Comparison
| Metric | Top Pick Op GPT-5.5 (high) | Op GPT-5.5 (medium) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $5.00/1M | $5.00/1M |
| Output Cost | $30.00/1M | $30.00/1M |
| Blended (3:1) | $11.25/1M | $11.25/1M |
| Specifications | ||
| Organization | OpenAI | OpenAI |
| Release Date | Apr 23, 2026 | Apr 23, 2026 |
| Performance & Speed | ||
| Throughput | 60.0 tok/s | 55.3 tok/s |
| TTFT | 17089ms | 5141ms |
| Latency | 17089ms | 5141ms |
| Composite Indices | ||
| Value Score | 100.0 | 97.3 |
| Reasoning Score | 65.0 | 63.3 |
| Intelligence | 58.9 | 56.7 |
| Coding | 58.5 | 56.2 |
| Standard Benchmarks | ||
| GPQA | 93.2% | 92.6% |
| HLE | 43.0% | 40.6% |
| SciCode | 55.9% | 53.5% |
| LCR | 73.3% | 72.3% |
| IFBench | 71.6% | 71.0% |
| TAU-bench v2 | 93.0% | 91.8% |
| TerminalBench Hard | 59.8% | 57.6% |
Key Takeaways
GPT-5.5 (high) offers the best value at $5.00/1M, making it ideal for high-volume applications and cost-conscious projects.
GPT-5.5 (high) has the strongest reasoning profile with a 65.0 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5.5 (high) reaches a 58.5 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 (high)
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
GPT-5.5 (medium)
- General-purpose AI
- Versatile applications
