Model Comparison
Grok 4.3 (Low)
vs. Claude Opus 5.5 (Max, Default Fallback)
Comparing 2 AI models · 0 benchmarks · SpaceXAI, Anthropic
Recommended Pick
Strongest on: Value, Input price, Output price
Best Value
Grok 4.3 (Low)
100.0 value score
24.3 reasoning / $1.56/1M
Lowest Price
Grok 4.3 (Low)
$1.25/1M input price
Best Reasoning
Claude Opus 5.5 (Max, Default Fallback)
57.6 reasoning score
Blends available reasoning benchmarks
Differences That Matter
Best value
Grok 4.3 (Low) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Grok 4.3 (Low) is 3.2x cheaper on input tokens than Claude Opus 5.5 (Max, Default Fallback).
Reasoning gap
Claude Opus 5.5 (Max, Default Fallback) leads Grok 4.3 (Low) by 33.3 points on reasoning.
Top-pick rationale
Grok 4.3 (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.
Grok 4.3 (Low)
SpaceXAI
TTFT
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Time
—
tok/s
—
Tokens
—
Cost
—
Claude Opus 5.5 (Max, Default Fallback)
Anthropic
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Secure AI Chat made in Europe
Use open-weight models like DeepSeek, Qwen and Kimi in one app.
EU-hosted open models, one API
Servers in Germany & Finland. Operated by a German company under the GDPR, DPA available, ISO 27001-certified data centres.
Full Comparison
| Metric | Top Pick Sp Grok 4.3 (Low) | An Claude Opus 5.5 (Max, Default Fallback) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.25/1M | $4.00/1M |
| Output Cost | $2.50/1M | $20.00/1M |
| Blended (3:1) | $1.56/1M | $8.00/1M |
| Specifications | ||
| Organization | SpaceXAI | Anthropic |
| Release Date | Apr 30, 2026 | Sep 22, 2026 |
| Performance & Speed | ||
| Throughput | 92.4 tok/s | 96.4 tok/s |
| TTFT | 5310ms | 610040ms |
| Latency | 5310ms | 610040ms |
| Composite Indices | ||
| Value Score | 100.0 | 46.3 |
| Reasoning Score | 24.3 | 57.6 |
| Intelligence | 24.3 | 57.6 |
Key Takeaways
Grok 4.3 (Low) offers the best value at $1.25/1M,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.
All models support context windows of ∞+ tokens,suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Grok 4.3 (Low)
- Cost-sensitive applications
- High-volume processing
Claude Opus 5.5 (Max, Default Fallback)
- Complex reasoning tasks
- Research & analysis
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