Gemini 3.5 Flash vs GLM 5.1
| Signal | Gemini 3.5 Flash | Delta | GLM 5.1 |
|---|---|---|---|
Capabilities | 100 | +33 | |
Benchmarks | 77 | +1 | |
Pricing | 91 | -6 | |
Context window size | 86 | +10 | |
Recency | 100 | -- | |
Output Capacity | 80 | -5 | |
| Overall Result | 3 wins | of 6 | 2 wins |
Score History
78.5
current score
Gemini 3.5 Flash
right now
75.8
current score
Gemini 3.5 Flash
GLM 5.1
Zhipu AI
GLM 5.1 saves you $351.60/month
That's $4219.20/year compared to Gemini 3.5 Flash at your current usage level of 100K calls/month.
| Metric | Gemini 3.5 Flash | GLM 5.1 | Winner |
|---|---|---|---|
| Overall Score | 79 | 76 | Gemini 3.5 Flash |
| Rank | #55 | #65 | Gemini 3.5 Flash |
| Quality Rank | #55 | #65 | Gemini 3.5 Flash |
| Adoption Rank | #55 | #65 | Gemini 3.5 Flash |
| Parameters | -- | -- | -- |
| Context Window | 1049K | 203K | Gemini 3.5 Flash |
| Pricing | $1.50/$9.00/M | $0.97/$3.04/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 67 | Gemini 3.5 Flash |
| Benchmarks | 77 | 76 | Gemini 3.5 Flash |
| Pricing | 91 | 97 | GLM 5.1 |
| Context window size | 86 | 76 | Gemini 3.5 Flash |
| Recency | 100 | 100 | Gemini 3.5 Flash |
| Output Capacity | 80 | 85 | GLM 5.1 |
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 79/100 (rank #55), placing it in the top 81% of all 290 models tracked.
Scores 76/100 (rank #65), placing it in the top 78% of all 290 models tracked.
With only a 3-point gap, these models are in the same performance tier. The practical difference in output quality is minimal - your choice should depend on pricing, latency requirements, and specific feature needs.
Choose Gemini 3.5 Flash when you need:
- Processing long documents or large codebases (1049K token context)
- Multimodal workflows that require image understanding
- Step-by-step reasoning and chain-of-thought problem solving
Choose GLM 5.1 when you need:
- High-volume production workloads where API costs must be minimized
- Step-by-step reasoning and chain-of-thought problem solving
- Self-hosted deployments where you need full control over the model
GLM 5.1 offers 62% better value per quality point. At 1M tokens/day, you'd spend $60.03/month with GLM 5.1 vs $157.50/month with Gemini 3.5 Flash - a $97.47 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. GLM 5.1 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 ($3.04/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (79/100) 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 3.5 Flash and GLM 5.1 are extremely close in overall performance (only 2.700000000000003 points apart). Your best choice depends entirely on which specific strengths matter most for your use case.
By Use Case
Best for Quality
Gemini 3.5 Flash
Marginally better benchmark scores; both are excellent
Best for Cost
GLM 5.1
62% lower pricing; better value at scale
Best for Reliability
Gemini 3.5 Flash
Higher uptime and faster response speeds
Best for Prototyping
Gemini 3.5 Flash
Stronger community support and better developer experience
Best for Production
Gemini 3.5 Flash
Wider enterprise adoption and proven at scale
by Google
- Choose for Quality - Marginally better benchmark scores; both are excellent
- Choose for Reliability - Higher uptime and faster response speeds
- Choose for Prototyping - Stronger community support and better developer experience
- Choose for Production - Wider enterprise adoption and proven at scale
| Capability | Gemini 3.5 Flash | GLM 5.1 |
|---|---|---|
| Vision (Image Input)differs | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Searchdiffers | ||
| Image Output |
Gemini 3.5 Flash
GLM 5.1
Zhipu AI
GLM 5.1 saves you $8.12/month
That's 60% cheaper than Gemini 3.5 Flash 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 3.5 Flash | GLM 5.1 |
|---|---|---|
| Context Window | 1.0M | 203K |
| Max Output Tokens | 65,536 | 128,000 |
| Open Source | No | Yes |
| Created | May 19, 2026 | Apr 7, 2026 |