GLM-4.7-Flash vs Grok 4 Fast
Grok 4 Fast leads the LLM Stats Score 32.0 to 23.8. GLM-4.7-Flash is 1.8x cheaper per token.
Zhipu AI · xAI · Updated for 2026
Which is better?
Grok 4 Fast leads the overall LLM Stats Score 32.0 to 23.8, ranking #101 overall.
In the 4 individual benchmarks reported for both models, Grok 4 Fast wins 4; this is a narrower head-to-head signal than the composite indexes.
On price, GLM-4.7-Flash is roughly 1.8x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok 4 Fast also accepts a larger context window (2,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GLM-4.7-Flash
- cost matters — it's about 1.8x cheaper per token
- you want the most recent training data — it shipped Jan 2026
- you need open weights you can self-host or fine-tune
Choose Grok 4 Fast
- overall performance matters — it scores 32.0 and ranks #101 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 4 of 4 exact shared results
- you process long inputs — it offers a 2,000,000 token context window
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
6 reported for GLM-4.7-Flash · 7 for Grok 4 Fast
GLM-4.7-Flash outperforms in 0 benchmarks, while Grok 4 Fast is better at 4 benchmarks (AIME 2025, BrowseComp, GPQA, Humanity's Last Exam).
Grok 4 Fast significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GLM-4.7-Flash ($0.07/1M tokens) is 2.9x cheaper than Grok 4 Fast ($0.20/1M tokens).
For output processing, GLM-4.7-Flash ($0.40/1M tokens) is 1.3x cheaper than Grok 4 Fast ($0.50/1M tokens).
In conclusion, Grok 4 Fast is more expensive than GLM-4.7-Flash.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok 4 Fast accepts 2,000,000 input tokens compared to GLM-4.7-Flash's 128,000 tokens. Grok 4 Fast can generate longer responses up to 30,000 tokens, while GLM-4.7-Flash is limited to 16,384 tokens.
Input capabilities
Documented input modalities across available providers
Grok 4 Fast supports multimodal inputs, whereas GLM-4.7-Flash does not.
Grok 4 Fast can handle both text and other forms of data like images, making it suitable for multimodal applications.
GLM-4.7-Flash
Grok 4 Fast
License
Usage and distribution terms
GLM-4.7-Flash is licensed under MIT, while Grok 4 Fast uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
MIT
Open weights
Proprietary
Closed source
Release Timeline
When each model was launched
GLM-4.7-Flash was released on 2026-01-19, while Grok 4 Fast was released on 2025-08-28.
GLM-4.7-Flash is 5 months newer than Grok 4 Fast.
Jan 19, 2026
7 months ago
4mo newerAug 28, 2025
1.0 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
GLM-4.7-Flash is available from ZAI. Grok 4 Fast is available from xAI.
GLM-4.7-Flash
Grok 4 Fast
Outputs Comparison
Judge for yourself.
Run your own prompts against GLM-4.7-Flash and Grok 4 Fast side-by-side, then vote on the output you prefer.
FAQ
Common questions about GLM-4.7-Flash vs Grok 4 Fast.