Model Comparison
Grok 4 Fast vs Qwen3-235B-A22B-Thinking-2507Which is better in 2026?
Grok 4 Fast shows notably better performance in the majority of benchmarks. Grok 4 Fast is 3.5x cheaper per token.
Verdict: Grok 4 Fast vs Qwen3-235B-A22B-Thinking-2507 — which is better?
Grok 4 Fast (by xAI) and Qwen3-235B-A22B-Thinking-2507 (by Alibaba Cloud / Qwen Team) 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.
Grok 4 Fast outperforms in 2 benchmarks (GPQA, Humanity's Last Exam), while Qwen3-235B-A22B-Thinking-2507 is better at 1 benchmark (AIME 2025). Grok 4 Fast shows notably better performance in the majority of benchmarks.
On price, Grok 4 Fast is roughly 3.5x 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.
Choose Grok 4 Fast if…
- you want the strongest raw capability — it leads on 2 of 3 shared benchmarks
- cost matters — it's about 3.5x cheaper per token
- you process long inputs — it offers a 2,000,000 token context window
- you want the most recent training data — it shipped Aug 2025
Choose Qwen3-235B-A22B-Thinking-2507 if…
- you need open weights you can self-host or fine-tune
Performance Benchmarks
Comparative analysis across standard metrics
Grok 4 Fast outperforms in 2 benchmarks (GPQA, Humanity's Last Exam), while Qwen3-235B-A22B-Thinking-2507 is better at 1 benchmark (AIME 2025).
Grok 4 Fast shows notably better performance in the majority of benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Grok 4 Fast ($0.20/1M tokens) is 1.5x cheaper than Qwen3-235B-A22B-Thinking-2507 ($0.30/1M tokens).
For output processing, Grok 4 Fast ($0.50/1M tokens) is 6.0x cheaper than Qwen3-235B-A22B-Thinking-2507 ($3.00/1M tokens).
In conclusion, Qwen3-235B-A22B-Thinking-2507 is more expensive than Grok 4 Fast.*
* 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 Qwen3-235B-A22B-Thinking-2507's 262,144 tokens. Qwen3-235B-A22B-Thinking-2507 can generate longer responses up to 131,072 tokens, while Grok 4 Fast is limited to 30,000 tokens.
Input Capabilities
Supported data types and modalities
Grok 4 Fast supports multimodal inputs, whereas Qwen3-235B-A22B-Thinking-2507 does not.
Grok 4 Fast can handle both text and other forms of data like images, making it suitable for multimodal applications.
Grok 4 Fast
Qwen3-235B-A22B-Thinking-2507
License
Usage and distribution terms
Grok 4 Fast is licensed under a proprietary license, while Qwen3-235B-A22B-Thinking-2507 uses Apache 2.0.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Apache 2.0
Open weights
Release Timeline
When each model was launched
Grok 4 Fast was released on 2025-08-28, while Qwen3-235B-A22B-Thinking-2507 was released on 2025-07-25.
Grok 4 Fast is 1 month newer than Qwen3-235B-A22B-Thinking-2507.
Aug 28, 2025
10 months ago
1mo newerJul 25, 2025
12 months 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
Grok 4 Fast is available from xAI. Qwen3-235B-A22B-Thinking-2507 is available from Fireworks, Novita.
Grok 4 Fast
Qwen3-235B-A22B-Thinking-2507
Outputs Comparison
Key Takeaways
Qwen3-235B-A22B-Thinking-2507
View detailsAlibaba Cloud / Qwen Team
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Grok 4 Fast and Qwen3-235B-A22B-Thinking-2507 side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Grok 4 Fast vs Qwen3-235B-A22B-Thinking-2507.