| Signal | Gemini 3.1 Pro Preview Custom Tools | Delta | Gemini 3.5 Flash |
|---|---|---|---|
Capabilities | 100 | -- | |
Benchmarks | 92 | +15 | |
Pricing | 88 | -3 | |
Context window size | 86 | -- | |
Recency | 100 | -- | |
Output Capacity | 80 | -- | |
| Overall Result | 1 wins | of 6 | 1 wins |
Score History
91.7
current score
Gemini 3.1 Pro Preview Custom Tools
right now
78.5
current score
Gemini 3.5 Flash saves you $200.00/month
That's $2400.00/year compared to Gemini 3.1 Pro Preview Custom Tools at your current usage level of 100K calls/month.
| Metric | Gemini 3.1 Pro Preview Custom Tools | Gemini 3.5 Flash | Winner |
|---|---|---|---|
| Overall Score | 92 | 79 | Gemini 3.1 Pro Preview Custom Tools |
| Rank | #7 | #55 | Gemini 3.1 Pro Preview Custom Tools |
| Quality Rank | #7 | #55 | Gemini 3.1 Pro Preview Custom Tools |
| Adoption Rank | #7 | #55 | Gemini 3.1 Pro Preview Custom Tools |
| Parameters | -- | -- | -- |
| Context Window | 1049K | 1049K | Gemini 3.1 Pro Preview Custom Tools |
| Pricing | $2.00/$12.00/M | $1.50/$9.00/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 100 | Gemini 3.1 Pro Preview Custom Tools |
| Benchmarks | 92 | 77 | Gemini 3.1 Pro Preview Custom Tools |
| Pricing | 88 | 91 | Gemini 3.5 Flash |
| Context window size | 86 | 86 | Gemini 3.1 Pro Preview Custom Tools |
| Recency | 100 | 100 | Gemini 3.1 Pro Preview Custom Tools |
| Output Capacity | 80 | 80 | Gemini 3.1 Pro Preview Custom Tools |
Our score (0-100) is driven by benchmark performance (90%) from Arena Elo ratings, MMLU, GPQA, HumanEval, SWE-bench, and 15+ standardized evaluations. Capabilities and context window serve as tiebreakers (10%). Learn more about our methodology.
Scores 92/100 (rank #7), placing it in the top 98% of all 290 models tracked.
Scores 79/100 (rank #55), placing it in the top 81% of all 290 models tracked.
Gemini 3.1 Pro Preview Custom Tools has a 13-point advantage, which typically translates to noticeably better performance on complex reasoning, code generation, and multi-step tasks.
Gemini 3.5 Flash offers 25% better value per quality point. At 1M tokens/day, you'd spend $157.50/month with Gemini 3.5 Flash vs $210.00/month with Gemini 3.1 Pro Preview Custom Tools - a $52.50 monthly difference.
Both models have comparable response speeds. For most applications, the latency difference is negligible.
When latency matters most: Interactive chatbots, IDE code completion, real-time translation, and user-facing applications where response time directly impacts experience. For batch processing, background summarization, or offline analysis, latency is less critical.
Code generation & review
Based on overall model capabilities and architecture for coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Suitable for user-facing chat with competitive response times. Gemini 3.5 Flash also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (1049K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($9.00/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (92/100) correlates with better nuance, coherence, and style in long-form content
Image understanding & OCR
Supports vision input - can analyze screenshots, diagrams, photos, and scanned documents directly
Gemini 3.1 Pro Preview Custom Tools clearly outperforms Gemini 3.5 Flash with a significant 13.200000000000003-point lead. For most general use cases, Gemini 3.1 Pro Preview Custom Tools is the stronger choice. However, Gemini 3.5 Flash may still excel in niche scenarios.
Best for Quality
Gemini 3.1 Pro Preview Custom Tools
Marginally better benchmark scores; both are excellent
Best for Cost
Gemini 3.5 Flash
25% lower pricing; better value at scale
Best for Reliability
Gemini 3.1 Pro Preview Custom Tools
Higher uptime and faster response speeds
Best for Prototyping
Gemini 3.1 Pro Preview Custom Tools
Stronger community support and better developer experience
Best for Production
Gemini 3.1 Pro Preview Custom Tools
Wider enterprise adoption and proven at scale
by Google
| Capability | Gemini 3.1 Pro Preview Custom Tools | Gemini 3.5 Flash |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Search | ||
| Image Output |
Gemini 3.5 Flash saves you $4.50/month
That's 25% cheaper than Gemini 3.1 Pro Preview Custom Tools at 1,000 tokens/request and 100 requests/day.
Assumes 60% input / 40% output token ratio per request. Actual costs may vary based on your usage pattern.
| Parameter | Gemini 3.1 Pro Preview Custom Tools | Gemini 3.5 Flash |
|---|---|---|
| Context Window | 1.0M | 1.0M |
| Max Output Tokens | 65,536 | 65,536 |
| Open Source | No | No |
| Created | Feb 25, 2026 | May 19, 2026 |