Model Comparison
DeepSeek-V4-Flash-0731 vs Grok 4.5Which is better in 2026?
Both models are evenly matched across the benchmarks. DeepSeek-V4-Flash-0731 is 26.7x cheaper per token.
Verdict: DeepSeek-V4-Flash-0731 vs Grok 4.5 — which is better?
DeepSeek-V4-Flash-0731 (by DeepSeek) and Grok 4.5 (by xAI) 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.
DeepSeek-V4-Flash-0731 outperforms in 1 benchmarks (DeepSWE), while Grok 4.5 is better at 1 benchmark (Terminal-Bench 2.1). Both models are evenly matched across the benchmarks.
On price, DeepSeek-V4-Flash-0731 is roughly 26.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
DeepSeek-V4-Flash-0731 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.
Choose DeepSeek-V4-Flash-0731 if…
- cost matters — it's about 26.7x cheaper per token
- you process long inputs — it offers a 1,048,576 token context window
- you want the most recent training data — it shipped Jul 2026
- you need open weights you can self-host or fine-tune
Choose Grok 4.5 if…
- you want predictable pricing at $2.00/M input and $6.00/M output
Performance Benchmarks
Comparative analysis across standard metrics
DeepSeek-V4-Flash-0731 outperforms in 1 benchmarks (DeepSWE), while Grok 4.5 is better at 1 benchmark (Terminal-Bench 2.1).
Both models are evenly matched across the benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, DeepSeek-V4-Flash-0731 ($0.09/1M tokens) is 22.2x cheaper than Grok 4.5 ($2.00/1M tokens).
For output processing, DeepSeek-V4-Flash-0731 ($0.18/1M tokens) is 33.3x cheaper than Grok 4.5 ($6.00/1M tokens).
In conclusion, Grok 4.5 is more expensive than DeepSeek-V4-Flash-0731.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
DeepSeek-V4-Flash-0731 accepts 1,048,576 input tokens compared to Grok 4.5's 500,000 tokens. Only DeepSeek-V4-Flash-0731 specifies output context (65,536 tokens).
Input Capabilities
Supported data types and modalities
Grok 4.5 supports multimodal inputs, whereas DeepSeek-V4-Flash-0731 does not.
Grok 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
DeepSeek-V4-Flash-0731
Grok 4.5
License
Usage and distribution terms
DeepSeek-V4-Flash-0731 is licensed under MIT, while Grok 4.5 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
DeepSeek-V4-Flash-0731 was released on 2026-07-31, while Grok 4.5 was released on 2026-07-16.
DeepSeek-V4-Flash-0731 is 1 month newer than Grok 4.5.
Jul 31, 2026
3 days ago
2w newerJul 16, 2026
2 weeks ago
Knowledge Cutoff
When training data ends
Grok 4.5 has a documented knowledge cutoff of 2026-02-01, while DeepSeek-V4-Flash-0731's cutoff date is not specified.
We can confirm Grok 4.5's training data extends to 2026-02-01, but cannot make a direct comparison without DeepSeek-V4-Flash-0731's cutoff date.
—
Feb 2026
Provider Availability
DeepSeek-V4-Flash-0731 is available from DeepInfra, Fireworks, Novita. Grok 4.5 is available from xAI.
DeepSeek-V4-Flash-0731
Grok 4.5
Outputs Comparison
Key Takeaways
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against DeepSeek-V4-Flash-0731 and Grok 4.5 side-by-side, then vote on the output you prefer.
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FAQ
Common questions about DeepSeek-V4-Flash-0731 vs Grok 4.5.