Model Comparison

GLM-4.5V vs GPT-5.1Which is better in 2026?

Comparing GLM-4.5V and GPT-5.1 across benchmarks, pricing, and capabilities.

Verdict: GLM-4.5V vs GPT-5.1 — which is better?

GLM-4.5V (by Zhipu AI) and GPT-5.1 (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

On price, GLM-4.5V is roughly 3.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-5.1 also accepts a larger context window (400,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose GLM-4.5V if…

  • cost matters — it's about 3.6x cheaper per token
  • you need open weights you can self-host or fine-tune

Choose GPT-5.1 if…

  • you process long inputs — it offers a 400,000 token context window
  • you want the most recent training data — it shipped Nov 2025
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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

GLM-4.5V and GPT-5.1 don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GLM-4.5V costs less

For input processing, GLM-4.5V ($0.55/1M tokens) is 2.3x cheaper than GPT-5.1 ($1.25/1M tokens).

For output processing, GLM-4.5V ($2.19/1M tokens) is 4.6x cheaper than GPT-5.1 ($10.00/1M tokens).

In conclusion, GPT-5.1 is more expensive than GLM-4.5V.*

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

Lowest available price from all providers
Sun Jun 07 2026 • llm-stats.com
Zhipu AI
GLM-4.5V
Input tokens$0.55
Output tokens$2.19
Best providerFireworks
OpenAI
GPT-5.1
Input tokens$1.25
Output tokens$10.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.1 accepts 400,000 input tokens compared to GLM-4.5V's 131,072 tokens. GLM-4.5V can generate longer responses up to 131,072 tokens, while GPT-5.1 is limited to 128,000 tokens.

Zhipu AI
GLM-4.5V
Input131,072 tokens
Output131,072 tokens
OpenAI
GPT-5.1
Input400,000 tokens
Output128,000 tokens
Sun Jun 07 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GLM-4.5V and GPT-5.1 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

GLM-4.5V

Text
Images
Audio
Video

GPT-5.1

Text
Images
Audio
Video

License

Usage and distribution terms

GLM-4.5V is licensed under MIT, while GPT-5.1 uses a proprietary license.

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

GLM-4.5V

MIT

Open weights

GPT-5.1

Proprietary

Closed source

Release Timeline

When each model was launched

GLM-4.5V was released on 2025-08-11, while GPT-5.1 was released on 2025-11-13.

GPT-5.1 is 3 months newer than GLM-4.5V.

GLM-4.5V

Aug 11, 2025

10 months ago

GPT-5.1

Nov 13, 2025

6 months ago

3mo newer

Knowledge Cutoff

When training data ends

GPT-5.1 has a documented knowledge cutoff of 2024-09-30, while GLM-4.5V's cutoff date is not specified.

We can confirm GPT-5.1's training data extends to 2024-09-30, but cannot make a direct comparison without GLM-4.5V's cutoff date.

GLM-4.5V

—

GPT-5.1

Sep 2024

Provider Availability

GLM-4.5V is available from Fireworks, Novita. GPT-5.1 is available from OpenAI.

GLM-4.5V

fireworks logo
Fireworks
Input Price:Input: $0.55/1MOutput Price:Output: $2.19/1M
novita logo
Novita
Input Price:Input: $0.60/1MOutput Price:Output: $2.20/1M

GPT-5.1

openai logo
OpenAI
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Zhipu AI
Less expensive input tokens
Less expensive output tokens
Has open weights
OpenAI
Larger context window (400,000 tokens)

Detailed Comparison

AI Model Comparison Table
Feature
Zhipu AI
GLM-4.5V
OpenAI
GPT-5.1

FAQ

Common questions about GLM-4.5V vs GPT-5.1.

Which is better, GLM-4.5V or GPT-5.1?

GLM-4.5V (Zhipu AI) and GPT-5.1 (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does GLM-4.5V compare to GPT-5.1 in benchmarks?

GPT-5.1 scores Tau2 Telecom: 95.6%, AIME 2025: 94.0%, BrowseComp Long Context 128k: 90.0%, GPQA: 88.1%, MMMU: 85.4%.

Is GLM-4.5V cheaper than GPT-5.1?

GLM-4.5V is 2.3x cheaper for input tokens. GLM-4.5V costs $0.55/M input and $2.19/M output via fireworks. GPT-5.1 costs $1.25/M input and $10.00/M output via openai.

What are the context window sizes for GLM-4.5V and GPT-5.1?

GLM-4.5V supports 131K tokens and GPT-5.1 supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GLM-4.5V and GPT-5.1?

Key differences include context window (131K vs 400K), input pricing ($0.55 vs $1.25/M), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes GLM-4.5V and GPT-5.1?

GLM-4.5V is developed by Zhipu AI and GPT-5.1 is developed by OpenAI.

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