Model Comparison
GPT-5.6 Luna (Max)
vs. Claude Opus 5.5 (Max, Default Fallback)
GPT-5.6 Luna (Max) has not been available at LLMBase since 26 October 2026. Open alternative: DeepSeek V4 Pro →
Claude Opus 5.5 (Max, Default Fallback) has not been available at LLMBase since 26 October 2026. Open alternative: DeepSeek V4 Pro →
Comparing 2 AI models · 0 benchmarks · OpenAI, Anthropic
Recommended Pick
OpGPT-5.6 Luna (Max)7 metric winsStrongest on: Value, Input price, Output price
Best Value
GPT-5.6 Luna (Max)
100.0 value score
23.8 reasoning / $0.45/1M
Lowest Price
GPT-5.6 Luna (Max)
$0.20/1M input price
Best Reasoning
Claude Opus 5.5 (Max, Default Fallback)
59.1 reasoning score
Blends available reasoning benchmarks
Differences That Matter
Best value
GPT-5.6 Luna (Max) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GPT-5.6 Luna (Max) is 20x cheaper on input tokens than Claude Opus 5.5 (Max, Default Fallback).
Speed gap
GPT-5.6 Luna (Max) generates about 1.3x 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 (Max) by 35.3 points on reasoning.
Top-pick rationale
GPT-5.6 Luna (Max) 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 (Max)
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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Claude Opus 5.5 (Max, Default Fallback)
Anthropic
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?
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Full Comparison
| Metric | Top Pick Op GPT-5.6 Luna (Max) | 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 | 125.3 tok/s | 95.3 tok/s |
| TTFT | 102550ms | 645360ms |
| Latency | 102550ms | 645360ms |
| Composite Indices | ||
| Value Score | 100.0 | 14.0 |
| Reasoning Score | 23.8 | 59.1 |
| Intelligence | 23.8 | 59.1 |
Key Takeaways
GPT-5.6 Luna (Max) 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 59.1 reasoning score,combining the available reasoning-heavy benchmarks.
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 (Max)
- Cost-sensitive applications
- High-volume processing
Claude Opus 5.5 (Max, Default Fallback)
- Complex reasoning tasks
- Research & analysis
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