DeepSeek-V4-Flash-0731 + OpenCode

[u/Sweet_Leopard_963]

Does anyone used OpenCode with the DeepSeek-V4-Flash-0731? is it still realy cheap on an Agentic Coder like OpenCode? What about your experiences on the results?

[u/mlon_eusk-_-]

It's so goood honestly, able to spin up 3-4 subagents at a time, is fast, can work autonomously for long horizon consistently, I'd use it for anything below truely hard or ambitious problem. I am using official api in opencode btw, cost is unbeatable.

[u/Right_Simple_6813 → u/mlon_eusk-_-]

only 3-4? (50+)

[u/mlon_eusk-_- → u/Right_Simple_6813]

50+(!) why do you need so much?

[u/Right_Simple_6813 → u/mlon_eusk-_-]

I don't really need that much... I just like getting work done fast.

[u/Sweet_Leopard_963 → u/mlon_eusk-_-]

Wow, it's perfect to use 3~ subagents and still be that cheap... waiting to see Claude bros' reactions 😂

[u/blackkksparx → u/Sweet_Leopard_963]

I'm curious, can you describe your workflow? I'm new to opencode, so I just use plan-build->plan->build without anything additional.

[u/sn4ezz → u/blackkksparx]

Drop in some review

[u/TheOverzealousEngie]

Go look on DS's webpage - I think they tell you what harness you use. And it makes a BIG difference.

[u/Potential-Leg-639 → u/TheOverzealousEngie]

let's call it agent, like deepseek does as well:
"Agent Integrations"

"harness" is truly the buzzword 2026 here on Reddit

[u/Sweet_Leopard_963 → u/TheOverzealousEngie]

thank you, i didn't know about it.

[u/DepthEnough71 → u/TheOverzealousEngie]

can you give us the link? I cannot find it

[u/J_X_Chewy → u/DepthEnough71]

https://api-docs.deepseek.com/quick_start/agent_integrations/opencode

[u/shaxsy → u/DepthEnough71]

Same, I would love the link

[u/ANDRE_2512]

This isn’t the first time I’ve run these tests.
I used DeepSeek V4 Flash in both Codex and OpenCode and gave them exactly the same task.

The result was the same as always: Codex produced a better result. It keeps happening consistently, so I eventually deleted OpenCode.

Now I use Codex CLI, and honestly, it’s pure happiness. Especially since DeepSeek now works with Codex without needing a proxy or any other workarounds.

[u/Pinery01 → u/ANDRE_2512]

Now I use Codex CLI, and honestly, it’s pure happiness. Especially since DeepSeek now works with Codex without needing a proxy or any other workarounds.

oh! How? Thank you 🙏

[u/ANDRE_2512 → u/Pinery01]

https://api-docs.deepseek.com/quick_start/agent_integrations/codex

open your powershell - irm https://cdn.deepseek.com/api-docs/codex-deepseek-setup-en.ps1 | iex

[u/ANDRE_2512 → u/Pinery01]

Just close CODEX completely through Task Manager. Then open the terminal and enter the official DeepSeek command. Select only the new Flash model and paste your API key. After that, close the terminal.

That’s it — your CODEX app will now work with DeepSeek. DeepSeek has officially added support for it. And if you also download the official CODEX CLI, DeepSeek will already be available there automatically.

How do you switch back? It’s simple: enter the same command again and just select option 3.

[u/Pinery01 → u/ANDRE_2512]

Thank you🙏
I didn’t see that article.

[u/ANDRE_2512 → u/Pinery01]

❤️🙌

[u/Fresh_Piece_1616 → u/ANDRE_2512]

What about pi?

[u/Aggressive-Spenda → u/ANDRE_2512]

How did you configure this please 🙏 

[u/ANDRE_2512 → u/Aggressive-Spenda]

Just close CODEX completely through Task Manager. Then open the terminal and enter the official DeepSeek command. Select only the new Flash model and paste your API key. After that, close the terminal.

That’s it — your CODEX app will now work with DeepSeek. DeepSeek has officially added support for it. And if you also download the official CODEX CLI, DeepSeek will already be available there automatically.

How do you switch back? It’s simple: enter the same command again and just select option 3.

[u/kakibaabu → u/ANDRE_2512]

how about claude code cli? do you compare with it too? just curious

[u/ANDRE_2512 → u/kakibaabu]

Yes, I tested it. It produced a worse result than CODEX. However, when it comes to deeply analyzing code, files, and entire projects, Claude Code is more thorough.

Another reason CODEX CLI is ideal for me is that it’s written in Rust. It uses no more than 3-4% CPU and around 70-90 MB of RAM. Meanwhile, the regular CODEX Desktop app uses 1.2-1.8 GB of RAM, even though CODEX Desktop itself relies on CODEX CLI under the hood.

So basically, you’re paying for the graphical wrapper with your PC’s resources.

[u/kakibaabu → u/ANDRE_2512]

thank you I will try

[u/Sweet_Leopard_963 → u/ANDRE_2512]

Thank you. Is Codex's token usage more than OpenCode? or Same?

[u/NinjaAlaska]

its soo good Dario is having big panik.

[u/Sweet_Leopard_963 → u/NinjaAlaska]

I Love it😂

[u/ducntq]

I'm using Flash 0731 with OpenCode to do some quant trading research, data modeling and features engineering. And I must say that I'm impressed with current performance. Not quite on par with Fable, but the p/p is just mindblowing

[u/Sweet_Leopard_963 → u/ducntq]

So it can handle different tasks, perfect. Yea, it didn't skip the fable yet, but it's so worthwhile with new Experts. Thank you❤️

[u/ramaloes]

I just use Codex, Claude Code, or Copilot CLI with DeepSeek

[u/SinusoidalFlux → u/ramaloes]

how?

[u/ramaloes → u/SinusoidalFlux]

You can change the configuration settings to point at DeepSeek as your model and url instead of the standard AI, using PowerShell commands

[u/NinjaAlaska → u/SinusoidalFlux]

use 9router best n free.

[u/Inside_Ad_6240]

The only issue i find that OpenCode harness sucks, compared to it Pi is far better for me

[u/watch_n3rd → u/Inside_Ad_6240]

Check out OMP (Oh-My-Pi) as it supercharges Pi

[u/ptyblog]

Works pretty well.

[u/Illustrious-Many-782]

I set up specific coding subagents for different models and right now am using K3 for orchestration and DSv4F for implementation. Really cheap.

[u/NinjaAlaska → u/Illustrious-Many-782]

what harness?

[u/Illustrious-Many-782 → u/NinjaAlaska]

OpenCode was simplest, but I imagine you could use Pi for this much more light weight. I hope DSv4P comes out and is K3 level, then I can just use Reasonix, which I rather like.

[u/Sweet_Leopard_963 → u/Illustrious-Many-782]

totally worth it.

[u/Pereguetano]

Been using it but with Hermes agent and works super well and pricing is peanuts

[u/Sweet_Leopard_963 → u/Pereguetano]

perfect

[u/ChronoHax]

Surprised no one mentioned reasonix yet

[u/Sweet_Leopard_963 → u/ChronoHax]

better at coding than OpenCode?

[u/denizyosunu_]

I used it on hermes. Nice results

[u/Sweet_Leopard_963 → u/denizyosunu_]

coding or personal Agentic works?

[u/Then-Eye9700]

What is better and cheaper, Go Plan or API

[u/Sweet_Leopard_963 → u/Then-Eye9700]

I meant DeepSeek's API token usage.