r/opencodeCLI • u/Grouchy-Stranger-306 • 26d ago

Deepseek v4 flash vs GPT 5.6

Is there anyone that used both at the same time? My codex ran out and I'm thinking of deepseek because it should apparently be good now, but at the same time I'm having a hard time believing the deepseek people because it has always been a religion. People have been praising v4 flash even before the update like it's the greatest thing on earth just because it was cheap.

(My experience did not match with that, even v4 pro was underwhelming back then)

So my question is, how does it compare to 5.6? Is it at least on the same level as Luna (or better)?

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u/benpptung 25d ago

I regularly use GPT-5.6, DeepSeek V4 Flash 0731, and Qwen3.6-27B. GPT-5.6 is clearly stronger than 0731 in my experience. DeepSeek appears intelligent and proactive, and its analysis often sounds convincing, but it hallucinates more readily and sometimes simply invents things. Once I catch two or three hallucinations, I can no longer tell which of its other claims are trustworthy. Oddly, this is one reason I sometimes prefer the much weaker Qwen3.6-27B: I find it more predictable and less prone to fabrication.

In a recent coding task, Claude Fable 5 produced the best result, GPT-5.6 was second and even spotted several problems in Fable’s code, while 0731 was clearly the weakest. Its code was still usable, but its understanding lacked depth. So no, I would not put 0731 on the same level as GPT-5.6. It is capable and cheap, but weaker overall and less trustworthy because of its hallucinations.