Model Comparison
GPT-5.6 Luna (Low)
vs. Claude Opus 5.5 (Max, Default Fallback)
Comparing 2 AI models · 0 benchmarks · OpenAI, Anthropic
Recommended Pick
OpGPT-5.6 Luna (Low)7 metric winsStrongest on: Value, Input price, Output price
Best Value
GPT-5.6 Luna (Low)
100.0 value score
21.0 reasoning / $0.45/1M
Lowest Price
GPT-5.6 Luna (Low)
$0.20/1M input price
Best Reasoning
Claude Opus 5.5 (Max, Default Fallback)
57.6 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.6 Luna (Low)
44.2 coding index
Differences That Matter
Best value
GPT-5.6 Luna (Low) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GPT-5.6 Luna (Low) is 20x cheaper on input tokens than Claude Opus 5.5 (Max, Default Fallback).
Speed gap
GPT-5.6 Luna (Low) generates about 1.2x as many tokens per second as Claude Opus 5.5 (Max, Default Fallback).
Reasoning gap
Claude Opus 5.5 (Max, Default Fallback) leads GPT-5.6 Luna (Low) by 36.6 points on reasoning.
Top-pick rationale
GPT-5.6 Luna (Low) wins 7 measurable categories, including Value, Input price, Output price, Blended price.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GPT-5.6 Luna (Low)
OpenAI
TTFT
—
Time
—
tok/s
—
Tokens
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Cost
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Claude Opus 5.5 (Max, Default Fallback)
Anthropic
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
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Full Comparison
| Metric | Top Pick Op GPT-5.6 Luna (Low) | An Claude Opus 5.5 (Max, Default Fallback) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.20/1M | $4.00/1M |
| Output Cost | $1.20/1M | $20.00/1M |
| Blended (3:1) | $0.45/1M | $8.00/1M |
| Specifications | ||
| Organization | OpenAI | Anthropic |
| Release Date | Jul 9, 2026 | Sep 22, 2026 |
| Performance & Speed | ||
| Throughput | 109.2 tok/s | 93.0 tok/s |
| TTFT | 1580ms | 717480ms |
| Latency | 1580ms | 717480ms |
| Composite Indices | ||
| Value Score | 100.0 | 15.4 |
| Reasoning Score | 21.0 | 57.6 |
| Intelligence | 21.0 | 57.6 |
| Coding | 44.2 | — |
Key Takeaways
GPT-5.6 Luna (Low) offers the best value at $0.20/1M,making it ideal for high-volume applications and cost-conscious projects.
Claude Opus 5.5 (Max, Default Fallback) has the strongest reasoning profile with a 57.6 reasoning score,combining the available reasoning-heavy benchmarks.
GPT-5.6 Luna (Low) reaches a 44.2 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 (Low)
- Cost-sensitive applications
- High-volume processing
- Code generation
- Software development
Claude Opus 5.5 (Max, Default Fallback)
- Complex reasoning tasks
- Research & analysis
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