Model Comparison

Gemini 3 Flash vs GLM-5.1

GLM-5.1 has a slight edge in benchmark performance. Gemini 3 Flash is 1.9x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

Gemini 3 Flash outperforms in 2 benchmarks (GPQA, Toolathlon), while GLM-5.1 is better at 3 benchmarks (Humanity's Last Exam, MCP Atlas, Terminal-Bench 2.0).

GLM-5.1 has a slight edge in benchmark performance.

Thu Apr 09 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 3 Flash costs less

For input processing, Gemini 3 Flash ($0.50/1M tokens) is 2.8x cheaper than GLM-5.1 ($1.40/1M tokens).

For output processing, Gemini 3 Flash ($3.00/1M tokens) is 1.5x cheaper than GLM-5.1 ($4.40/1M tokens).

In conclusion, GLM-5.1 is more expensive than Gemini 3 Flash.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Thu Apr 09 2026 • llm-stats.com
Google
Gemini 3 Flash
Input tokens$0.50
Output tokens$3.00
Best providerGoogle
Zhipu AI
GLM-5.1
Input tokens$1.40
Output tokens$4.40
Best providerUnknown Organization
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 3 Flash accepts 1,000,000 input tokens compared to GLM-5.1's 200,000 tokens. GLM-5.1 can generate longer responses up to 128,000 tokens, while Gemini 3 Flash is limited to 65,536 tokens.

Google
Gemini 3 Flash
Input1,000,000 tokens
Output65,536 tokens
Zhipu AI
GLM-5.1
Input200,000 tokens
Output128,000 tokens
Thu Apr 09 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 3 Flash supports multimodal inputs, whereas GLM-5.1 does not.

Gemini 3 Flash can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 3 Flash

Text
Images
Audio
Video

GLM-5.1

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 3 Flash is licensed under a proprietary license, while GLM-5.1 uses MIT.

License differences may affect how you can use these models in commercial or open-source projects.

Gemini 3 Flash

Proprietary

Closed source

GLM-5.1

MIT

Open weights

Release Timeline

When each model was launched

Gemini 3 Flash was released on 2025-12-17, while GLM-5.1 was released on 2026-04-07.

GLM-5.1 is 4 months newer than Gemini 3 Flash.

Gemini 3 Flash

Dec 17, 2025

3 months ago

GLM-5.1

Apr 7, 2026

2 days ago

3mo newer

Knowledge Cutoff

When training data ends

Gemini 3 Flash has a documented knowledge cutoff of 2025-01-31, while GLM-5.1's cutoff date is not specified.

We can confirm Gemini 3 Flash's training data extends to 2025-01-31, but cannot make a direct comparison without GLM-5.1's cutoff date.

Gemini 3 Flash

Jan 2025

GLM-5.1

—

Provider Availability

Gemini 3 Flash is available from Google. GLM-5.1 is available from ZAI.

Gemini 3 Flash

google logo
Google
Input Price:Input: $0.50/1MOutput Price:Output: $3.00/1M

GLM-5.1

z logo
Unknown Organization
Input Price:Input: $1.40/1MOutput Price:Output: $4.40/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,000,000 tokens)
Supports multimodal inputs
Less expensive input tokens
Less expensive output tokens
Higher GPQA score (90.4% vs 86.2%)
Higher Toolathlon score (49.4% vs 40.7%)
Zhipu AI
Has open weights
Higher Humanity's Last Exam score (52.3% vs 43.5%)
Higher MCP Atlas score (71.8% vs 57.4%)
Higher Terminal-Bench 2.0 score (69.0% vs 47.6%)

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 3 Flash
Zhipu AI
GLM-5.1

FAQ

Common questions about Gemini 3 Flash vs GLM-5.1

GLM-5.1 has a slight edge in benchmark performance. Gemini 3 Flash is made by Google and GLM-5.1 is made by Zhipu AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Gemini 3 Flash scores Vending-Bench 2: 100.0%, AIME 2025: 99.7%, Global PIQA: 92.8%, MMMLU: 91.8%, GPQA: 90.4%. GLM-5.1 scores Vending-Bench 2: 100.0%, AIME 2026: 95.3%, HMMT 2025: 94.0%, GPQA: 86.2%, IMO-AnswerBench: 83.8%.
Gemini 3 Flash is 2.8x cheaper for input tokens. Gemini 3 Flash costs $0.50/M input and $3.00/M output via google. GLM-5.1 costs $1.40/M input and $4.40/M output via z.
Gemini 3 Flash supports 1.0M tokens and GLM-5.1 supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (1.0M vs 200K), input pricing ($0.50 vs $1.40/M), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.
Gemini 3 Flash is developed by Google and GLM-5.1 is developed by Zhipu AI.