Model Comparison
GPT-5.6 Luna (Low)
vs. Claude Sonnet 5.5 (Max, Default Fallback)
Comparing 2 AI models · 0 benchmarks · OpenAI, Anthropic
Recommended Pick
OpGPT-5.6 Luna (Low)6 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 Sonnet 5.5 (Max, Default Fallback)
56.0 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 10x cheaper on input tokens than Claude Sonnet 5.5 (Max, Default Fallback).
Speed gap
Claude Sonnet 5.5 (Max, Default Fallback) generates about 1.3x as many tokens per second as GPT-5.6 Luna (Low).
Reasoning gap
Claude Sonnet 5.5 (Max, Default Fallback) leads GPT-5.6 Luna (Low) by 35.0 points on reasoning.
Top-pick rationale
GPT-5.6 Luna (Low) wins 6 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
—
Cost
—
Claude Sonnet 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 Sonnet 5.5 (Max, Default Fallback) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.20/1M | $2.00/1M |
| Output Cost | $1.20/1M | $10.00/1M |
| Blended (3:1) | $0.45/1M | $4.00/1M |
| Specifications | ||
| Organization | OpenAI | Anthropic |
| Release Date | Jul 9, 2026 | Sep 28, 2026 |
| Performance & Speed | ||
| Throughput | 109.2 tok/s | 139.0 tok/s |
| TTFT | 1580ms | 428360ms |
| Latency | 1580ms | 428360ms |
| Composite Indices | ||
| Value Score | 100.0 | 30.0 |
| Reasoning Score | 21.0 | 56.0 |
| Intelligence | 21.0 | 56.0 |
| 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 Sonnet 5.5 (Max, Default Fallback) has the strongest reasoning profile with a 56.0 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 Sonnet 5.5 (Max, Default Fallback)
- Complex reasoning tasks
- Research & analysis
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