Model Comparison
Claude Opus 5.5 (Xhigh, Default Fallback)
vs. Gemini 4 Carbon (High)
Claude Opus 5.5 (Xhigh, Default Fallback) has not been available at LLMBase since 26 October 2026. Open alternative: DeepSeek V4 Pro →
Comparing 2 AI models · 0 benchmarks · Anthropic, Google
Recommended Pick
GoGemini 4 Carbon (High)4 metric winsStrongest on: Value, Throughput, Reasoning
Best Value
Gemini 4 Carbon (High)
100.0 value score
59.4 reasoning / $8.00/1M
Lowest Price
Claude Opus 5.5 (Xhigh, Default Fallback)
$4.00/1M input price
Best Reasoning
Gemini 4 Carbon (High)
59.4 reasoning score
Blends available reasoning benchmarks
Differences That Matter
Best value
Gemini 4 Carbon (High) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Reasoning gap
Gemini 4 Carbon (High) leads Claude Opus 5.5 (Xhigh, Default Fallback) by 2.4 points on reasoning.
Top-pick rationale
Gemini 4 Carbon (High) wins 4 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.
Claude Opus 5.5 (Xhigh, Default Fallback)
Anthropic
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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Gemini 4 Carbon (High)
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 | An Claude Opus 5.5 (Xhigh, Default Fallback) | Top Pick Go Gemini 4 Carbon (High) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $4.00/1M | $4.00/1M |
| Output Cost | $20.00/1M | $20.00/1M |
| Blended (3:1) | $8.00/1M | $8.00/1M |
| Specifications | ||
| Organization | Anthropic | |
| Release Date | Sep 22, 2026 | Oct 28, 2026 |
| Performance & Speed | ||
| Throughput | 82.2 tok/s | 86.0 tok/s |
| TTFT | 121200ms | 123470ms |
| Latency | 121200ms | 123470ms |
| Composite Indices | ||
| Value Score | 96.0 | 100.0 |
| Reasoning Score | 57.0 | 59.4 |
| Intelligence | 57.0 | 59.4 |
Key Takeaways
Claude Opus 5.5 (Xhigh, Default Fallback) offers the best value at $4.00/1M,making it ideal for high-volume applications and cost-conscious projects.
Gemini 4 Carbon (High) has the strongest reasoning profile with a 59.4 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
Claude Opus 5.5 (Xhigh, Default Fallback)
- Cost-sensitive applications
- High-volume processing
Gemini 4 Carbon (High)
- Complex reasoning tasks
- Research & analysis
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