When was DeepSeek-V4-Flash released?

DeepSeek-V4-Flash was released by DeepSeek on Apr 24 2026.

When was GPT-5.1 released?

GPT-5.1 was released by OpenAI on Nov 12 2025.

Which is better on GPQA Diamond, DeepSeek-V4-Flash or GPT-5.1?

DeepSeek-V4-Flash scores higher on GPQA Diamond — DeepSeek-V4-Flash 88.1% vs GPT-5.1 88.1%.

Is DeepSeek-V4-Flash or GPT-5.1 open source?

DeepSeek-V4-Flash is an open-source / open-weight model released by DeepSeek. GPT-5.1 is a proprietary model released by OpenAI.

Home Analytics Contact

Latest Release

DeepSeek-V4-Pro

Apr 24 2026

Home/Compare/DeepSeek-V4-Flash vs GPT-5.1

DeepSeek-V4-Flash vs GPT-5.1

0 vs 2 benchmarks won

	DeepSeek DeepSeek-V4-Flash	OpenAI GPT-5.1
Overview
Company	DeepSeek	OpenAI
Release date	Apr 24 2026	Nov 12 2025
Model type	—	—
Open source	Yes	No
Specifications
Parameters	—	—
Context window	—	—
Benchmarks
Science reasoning GPQA Diamond	88.1%	88.1%
Software engineering SWE-Bench Verified	—	76.3%
Multimodal understanding MMMU	—	76%
Timeline
Release gap	GPT-5.1 shipped 163 days before DeepSeek-V4-Flash

Which is better: DeepSeek-V4-Flash or GPT-5.1?

GPT-5.1 leads DeepSeek-V4-Flash on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). GPT-5.1 shipped 163 days before DeepSeek-V4-Flash, so benchmark comparisons should account for the intervening progress.

DeepSeek-V4-Flash is an open-source / open-weight model; GPT-5.1 is proprietary.

On GPQA Diamond, both models score 88.1%.

Frequently asked questions

When was DeepSeek-V4-Flash released?: DeepSeek-V4-Flash was released by DeepSeek on Apr 24 2026.
When was GPT-5.1 released?: GPT-5.1 was released by OpenAI on Nov 12 2025.
Which is better on GPQA Diamond, DeepSeek-V4-Flash or GPT-5.1?: DeepSeek-V4-Flash scores higher on GPQA Diamond — DeepSeek-V4-Flash 88.1% vs GPT-5.1 88.1%.
Is DeepSeek-V4-Flash or GPT-5.1 open source?: DeepSeek-V4-Flash is an open-source / open-weight model released by DeepSeek. GPT-5.1 is a proprietary model released by OpenAI.