Model Comparison
Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
vs. Gemini 3.1 Pro Preview
Comparing 2 AI models · 7 benchmarks · Anthropic, Google
Recommended Pick
Go Gemini 3.1 Pro Preview 10 metric wins Strongest on: Value, Input price, Output price
Best Value
Gemini 3.1 Pro Preview
100.0 value score
65.3 reasoning / $4.50/1M
Lowest Price
Gemini 3.1 Pro Preview
$2.00/1M input price
Best Reasoning
Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
70.3 reasoning score
Blends available reasoning benchmarks
Best for Coding
Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
62.0 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
Gemini 3.1 Pro Preview has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Gemini 3.1 Pro Preview is 6.3x cheaper on input tokens than Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback).
Speed gap
Gemini 3.1 Pro Preview generates about 2.3x as many tokens per second as Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback).
Reasoning gap
Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) leads Gemini 3.1 Pro Preview by 4.9 points on reasoning.
Coding gap
Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) leads Gemini 3.1 Pro Preview by 6.5 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
Anthropic
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Gemini 3.1 Pro Preview
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | An Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) | Top Pick Go Gemini 3.1 Pro Preview |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $12.50/1M | $2.00/1M |
| Output Cost | $50.00/1M | $12.00/1M |
| Blended (3:1) | $21.88/1M | $4.50/1M |
| Specifications | ||
| Organization | Anthropic | |
| Release Date | Jun 9, 2026 | Feb 19, 2026 |
| Performance & Speed | ||
| Throughput | 55.5 tok/s | 126.6 tok/s |
| TTFT | 42331ms | 21111ms |
| Latency | 42331ms | 21111ms |
| Composite Indices | ||
| Value Score | 22.1 | 100.0 |
| Reasoning Score | 70.3 | 65.3 |
| Intelligence | 64.9 | 57.2 |
| Coding | 62.0 | 55.5 |
| Standard Benchmarks | ||
| GPQA | 92.6% | 94.1% |
| HLE | 53.3% | 44.7% |
| SciCode | 60.2% | 58.9% |
| LCR | 70.0% | 72.7% |
| IFBench | 63.5% | 77.1% |
| TAU-bench v2 | 98.5% | 95.6% |
| TerminalBench Hard | 62.9% | 53.8% |
Key Takeaways
Gemini 3.1 Pro Preview offers the best value at $2.00/1M, making it ideal for high-volume applications and cost-conscious projects.
Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) has the strongest reasoning profile with a 70.3 reasoning score, combining the available reasoning-heavy benchmarks.
Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) reaches a 62.0 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
Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
Gemini 3.1 Pro Preview
- Cost-sensitive applications
- High-volume processing
