Model Comparison
Gemini 2.5 Flash Preview (Reasoning)
vs. Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)
Comparing 2 AI models · 8 benchmarks · Google, Anthropic
Recommended Pick
AnClaude Opus 5 (Adaptive Reasoning, Xhigh Effort)6 metric winsStrongest on: Throughput, Reasoning, Intelligence
Lowest Price
Gemini 2.5 Flash Preview (Reasoning)
$0.00/1M input price
Best Reasoning
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)
70.2 reasoning score
Blends available reasoning benchmarks
Best for Coding
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)
77.0 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Price gap
Gemini 2.5 Flash Preview (Reasoning) is ∞x cheaper on input tokens than Claude Opus 5 (Adaptive Reasoning, Xhigh Effort).
Reasoning gap
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) leads Gemini 2.5 Flash Preview (Reasoning) by 13.8 points on reasoning.
Top-pick rationale
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) wins 6 measurable categories, including Throughput, Reasoning, Intelligence, GPQA.
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 (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 Opus 5 (Adaptive Reasoning, Xhigh Effort)
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 (Reasoning) | Top Pick An Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.00/1M | $5.00/1M |
| Output Cost | $0.00/1M | $25.00/1M |
| Blended (3:1) | — | $10.00/1M |
| Specifications | ||
| Organization | Anthropic | |
| Release Date | Apr 17, 2025 | Jul 24, 2026 |
| Performance & Speed | ||
| Throughput | — | 53.5 tok/s |
| TTFT | — | 18850ms |
| Latency | — | 18850ms |
| Composite Indices | ||
| Value Score | — | 100.0 |
| Reasoning Score | 56.4 | 70.2 |
| Intelligence | 17.7 | 62.5 |
| Coding | — | 77.0 |
| Standard Benchmarks | ||
| GPQA | 69.8% | 93.7% |
| MMLU Pro | 80.0% | — |
| HLE | 12.1% | 54.4% |
| LiveCodeBench | 50.5% | — |
| MATH 500 | 98.1% | — |
| AIME (Original) | 84.3% | — |
| SciCode | 35.9% | 55.0% |
| LCR | — | 76.3% |
Key Takeaways
Gemini 2.5 Flash Preview (Reasoning) offers the best value at $0.00/1M,making it ideal for high-volume applications and cost-conscious projects.
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) has the strongest reasoning profile with a 70.2 reasoning score,combining the available reasoning-heavy benchmarks.
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) reaches a 77.0 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
Gemini 2.5 Flash Preview (Reasoning)
- Cost-sensitive applications
- High-volume processing
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
