Model Comparison
GPT-5.6 Luna (xhigh)
vs. GPT-5.6 Terra (medium)
Comparing 2 AI models · 6 benchmarks · OpenAI
Recommended Pick
OpGPT-5.6 Luna (xhigh)12 metric winsStrongest on: Value, Input price, Output price
Best Value
GPT-5.6 Luna (xhigh)
100.0 value score
58.9 reasoning / $0.45/1M
Lowest Price
GPT-5.6 Luna (xhigh)
$0.20/1M input price
Best Reasoning
GPT-5.6 Luna (xhigh)
58.9 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.6 Luna (xhigh)
68.6 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
GPT-5.6 Luna (xhigh) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GPT-5.6 Luna (xhigh) is 10x cheaper on input tokens than GPT-5.6 Terra (medium).
Speed gap
GPT-5.6 Luna (xhigh) generates about 1.8x as many tokens per second as GPT-5.6 Terra (medium).
Reasoning gap
GPT-5.6 Luna (xhigh) leads GPT-5.6 Terra (medium) by 3.1 points on reasoning.
Coding gap
GPT-5.6 Luna (xhigh) leads GPT-5.6 Terra (medium) by 3.9 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GPT-5.6 Luna (xhigh)
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-5.6 Terra (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?
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Full Comparison
| Metric | Top Pick Op GPT-5.6 Luna (xhigh) | Op GPT-5.6 Terra (medium) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.20/1M | $2.00/1M |
| Output Cost | $1.20/1M | $12.00/1M |
| Blended (3:1) | $0.45/1M | $4.50/1M |
| Specifications | ||
| Organization | OpenAI | OpenAI |
| Release Date | Jul 9, 2026 | Jul 9, 2026 |
| Performance & Speed | ||
| Throughput | 145.0 tok/s | 80.7 tok/s |
| TTFT | 51110ms | 1945ms |
| Latency | 51110ms | 1945ms |
| Composite Indices | ||
| Value Score | 100.0 | 9.5 |
| Reasoning Score | 58.9 | 55.8 |
| Intelligence | 50.1 | 46.8 |
| Coding | 68.6 | 64.7 |
| Standard Benchmarks | ||
| GPQA | 89.5% | 87.2% |
| HLE | 37.0% | 33.3% |
| SciCode | 50.0% | 49.7% |
| LCR | 73.3% | 70.3% |
| IFBench | — | 62.2% |
| TAU-bench v2 | — | 72.8% |
Key Takeaways
GPT-5.6 Luna (xhigh) offers the best value at $0.20/1M,making it ideal for high-volume applications and cost-conscious projects.
GPT-5.6 Luna (xhigh) has the strongest reasoning profile with a 58.9 reasoning score,combining the available reasoning-heavy benchmarks.
GPT-5.6 Luna (xhigh) reaches a 68.6 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-5.6 Luna (xhigh)
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
GPT-5.6 Terra (medium)
- General-purpose AI
- Versatile applications
