DeepSeek-V4-Flash-0731 vs Grok-4.1 Fast Non-Reasoning
Comparing DeepSeek-V4-Flash-0731 and Grok-4.1 Fast Non-Reasoning across benchmarks, pricing, and capabilities.
DeepSeek · xAI · Updated for 2026
Which is better?
DeepSeek-V4-Flash-0731 and Grok-4.1 Fast Non-Reasoning trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.
On price, DeepSeek-V4-Flash-0731 is roughly 2.4x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok-4.1 Fast Non-Reasoning 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 benchmark, pricing, and model metadata for 2026.
Choose DeepSeek-V4-Flash-0731
- cost matters — it's about 2.4x cheaper per token
- you want the most recent training data — it shipped Jul 2026
- you need open weights you can self-host or fine-tune
Choose Grok-4.1 Fast Non-Reasoning
- you process long inputs — it offers a 2,000,000 token context window
At a glance
The differences that matter most.
Performance Benchmarks
Comparative analysis across standard metrics
DeepSeek-V4-Flash-0731 and Grok-4.1 Fast Non-Reasoningdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Arena Performance
Playground indexes and blind preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, DeepSeek-V4-Flash-0731 ($0.09/1M tokens) is 2.2x cheaper than Grok-4.1 Fast Non-Reasoning ($0.20/1M tokens).
For output processing, DeepSeek-V4-Flash-0731 ($0.18/1M tokens) is 2.8x cheaper than Grok-4.1 Fast Non-Reasoning ($0.50/1M tokens).
In conclusion, Grok-4.1 Fast Non-Reasoning 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
Grok-4.1 Fast Non-Reasoning accepts 2,000,000 input tokens compared to DeepSeek-V4-Flash-0731's 1,048,576 tokens. DeepSeek-V4-Flash-0731 can generate longer responses up to 65,536 tokens, while Grok-4.1 Fast Non-Reasoning is limited to 30,000 tokens.
Input Capabilities
Supported data types and modalities
Grok-4.1 Fast Non-Reasoning supports multimodal inputs, whereas DeepSeek-V4-Flash-0731 does not.
Grok-4.1 Fast Non-Reasoning can handle both text and other forms of data like images, making it suitable for multimodal applications.
DeepSeek-V4-Flash-0731
Grok-4.1 Fast Non-Reasoning
License
Usage and distribution terms
DeepSeek-V4-Flash-0731 is licensed under MIT, while Grok-4.1 Fast Non-Reasoning 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-4.1 Fast Non-Reasoning was released on 2025-11-17.
DeepSeek-V4-Flash-0731 is 9 months newer than Grok-4.1 Fast Non-Reasoning.
Jul 31, 2026
3 weeks ago
8mo newerNov 17, 2025
9 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
DeepSeek-V4-Flash-0731 is available from DeepInfra, Novita, Fireworks. Grok-4.1 Fast Non-Reasoning is available from xAI.
DeepSeek-V4-Flash-0731
Grok-4.1 Fast Non-Reasoning
Outputs Comparison
Judge for yourself.
Run your own prompts against DeepSeek-V4-Flash-0731 and Grok-4.1 Fast Non-Reasoning side-by-side, then vote on the output you prefer.
FAQ
Common questions about DeepSeek-V4-Flash-0731 vs Grok-4.1 Fast Non-Reasoning.