When was DeepSeek-V4-Flash released?

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

When was GPT-5.4-Pro released?

GPT-5.4-Pro was released by OpenAI on Mar 5 2026.

Which is better on GPQA Diamond, DeepSeek-V4-Flash or GPT-5.4-Pro?

GPT-5.4-Pro scores higher on GPQA Diamond — DeepSeek-V4-Flash 88.1% vs GPT-5.4-Pro 94.4%.

Is DeepSeek-V4-Flash or GPT-5.4-Pro open source?

DeepSeek-V4-Flash is an open-source / open-weight model released by DeepSeek. GPT-5.4-Pro is a proprietary model released by OpenAI.

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Latest Release

DeepSeek-V4-Pro

Apr 24 2026

Home/Compare/DeepSeek-V4-Flash vs GPT-5.4-Pro

DeepSeek-V4-Flash vs GPT-5.4-Pro

0 vs 1 benchmarks won

	DeepSeek DeepSeek-V4-Flash	OpenAI GPT-5.4-Pro
Overview
Company	DeepSeek	OpenAI
Release date	Apr 24 2026	Mar 5 2026
Model type	—	—
Open source	Yes	No
Specifications
Parameters	—	—
Context window	—	—
Benchmarks
Science reasoning GPQA Diamond	88.1%	94.4%
Software engineering SWE-Bench Verified	—	—
Multimodal understanding MMMU	—	—
Timeline
Release gap	GPT-5.4-Pro shipped 50 days before DeepSeek-V4-Flash

Which is better: DeepSeek-V4-Flash or GPT-5.4-Pro?

GPT-5.4-Pro leads DeepSeek-V4-Flash on 1 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). GPT-5.4-Pro shipped 50 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-5.4-Pro is proprietary.

On GPQA Diamond, GPT-5.4-Pro scores 94.4%, 6.3 points above DeepSeek-V4-Flash at 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-5.4-Pro released?: GPT-5.4-Pro was released by OpenAI on Mar 5 2026.
Which is better on GPQA Diamond, DeepSeek-V4-Flash or GPT-5.4-Pro?: GPT-5.4-Pro scores higher on GPQA Diamond — DeepSeek-V4-Flash 88.1% vs GPT-5.4-Pro 94.4%.
Is DeepSeek-V4-Flash or GPT-5.4-Pro open source?: DeepSeek-V4-Flash is an open-source / open-weight model released by DeepSeek. GPT-5.4-Pro is a proprietary model released by OpenAI.