Model Comparison
Gemini 2.5 Flash Preview (Sep '25) (Reasoning)
vs. Claude Sonnet 5.5 (Max, Default Fallback)
Comparing 2 AI models · 0 benchmarks · Google, Anthropic
Recommended Pick
AnClaude Sonnet 5.5 (Max, Default Fallback)2 metric winsStrongest on: Reasoning, Intelligence
Lowest Price
Claude Sonnet 5.5 (Max, Default Fallback)
$2.00/1M input price
Best Reasoning
Claude Sonnet 5.5 (Max, Default Fallback)
56.0 reasoning score
Blends available reasoning benchmarks
Differences That Matter
Reasoning gap
Claude Sonnet 5.5 (Max, Default Fallback) leads Gemini 2.5 Flash Preview (Sep '25) (Reasoning) by 40.5 points on reasoning.
Top-pick rationale
Claude Sonnet 5.5 (Max, Default Fallback) wins 2 measurable categories, including Reasoning, Intelligence.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Gemini 2.5 Flash Preview (Sep '25) (Reasoning)
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 Sonnet 5.5 (Max, 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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Which answer was more useful?
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Full Comparison
| Metric | Go Gemini 2.5 Flash Preview (Sep '25) (Reasoning) | Top Pick An Claude Sonnet 5.5 (Max, Default Fallback) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | — | $2.00/1M |
| Output Cost | — | $10.00/1M |
| Blended (3:1) | — | $4.00/1M |
| Specifications | ||
| Organization | Anthropic | |
| Release Date | Sep 25, 2025 | Sep 28, 2026 |
| Performance & Speed | ||
| Throughput | — | 139.0 tok/s |
| TTFT | — | 428360ms |
| Latency | — | 428360ms |
| Composite Indices | ||
| Value Score | — | 100.0 |
| Reasoning Score | 15.5 | 56.0 |
| Intelligence | 15.5 | 56.0 |
Key Takeaways
Claude Sonnet 5.5 (Max, Default Fallback) offers the best value at $2.00/1M,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.
All models support context windows of ∞+ tokens,suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Gemini 2.5 Flash Preview (Sep '25) (Reasoning)
- General-purpose AI
- Versatile applications
Claude Sonnet 5.5 (Max, Default Fallback)
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
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