DeepSeek V4 Flash on OpenCode Go now requires China hosting opt-in

What happened today

July 31, 2026 — DeepSeek shipped the official V4-Flash-0731 release (public beta). The model ID deepseek-v4-flash didn't change, but the upstream did: OpenCode Go/Zen now routes this model exclusively through DeepSeek's first-party API at api.deepseek.com, which is hosted on PRC infrastructure.

If you use OpenCode Go and have "Enable models hosted in China" disabled (the default), requests to deepseek-v4-flash now fail with:

"The latest version of this model is only available hosted in China and requires explicit opt in: https://opencode.ai/workspace/.../go"

This caught many developers mid-session today.

Why the change?

The preview version of V4 Flash (released April 24) was available via multiple third-party providers — DeepInfra, Fireworks, Novita, Morph, etc. — all offering US/EU residency with zero data retention.

The official 0731 release is served only from DeepSeek's own infrastructure in China. OpenCode's gateway doesn't yet proxy the 0731 checkpoint through non-China hosts. OpenCode staff confirmed on Bilibili that the gateway now serves the official build, and Responses API support is still in compatibility testing.

Your options right now

Option 1: Enable the China toggle (simplest)

Go to your OpenCode workspace: https://opencode.ai/workspace/<your-workspace-id>/go
Enable "Enable models hosted in China"
Continue using deepseek-v4-flash via OpenCode Go

Trade-off: Your requests (prompts, context, code) route through DeepSeek's PRC servers under Chinese data law. No ZDR (zero data retention) guarantee on this path.

Option 2: Use a non-China provider directly (recommended for data-sensitive work)

Provider	Region	ZDR	Input/Output per 1M	OpenAI-compatible
DeepInfra	US	✅	$0.09 / $0.18	Yes
Fireworks	Multi	✅	$0.14 / $0.28	Yes
Novita	US	✅	$0.14 / $0.28	Yes
Morph	US	✅	$0.14 / $0.28	Yes
Sference	EU	✅	$0.14 / $0.28	Yes
TensorX	EU	✅	$0.15 / $0.30	Yes

Set your own API key and base URL:

Env
# Example: DeepInfra
OPENAI_BASE_URL=https://api.deepinfra.com/v1/openai
OPENAI_API_KEY=your_deepinfra_key
OPENAI_MODEL=deepseek-v4-flash

This keeps your data in US/EU jurisdictions with zero data retention guarantees.

Option 3: Switch models on OpenCode Go

OpenCode Go includes 14+ models. Non-China-hosted alternatives on the platform:

MiMo-V2.5 (Xiaomi) — $0.28/1M, 30,100 req/5hr
MiMo-V2.5-Pro — $0.87/1M
Qwen3.7 Plus — $3.00/1M
GLM-5.2 (Zhipu) — $4.40/1M
Kimi K2.7 Code (Moonshot) — $3.50/1M
MiniMax M3 — $1.20/1M

Run with:

Bash
opencode run --model opencode-go/mimo-v2.5 "your task"

Option 4: Self-host (full control)

V4 Flash weights are MIT-licensed on Hugging Face (~158 GB FP4/FP8). Runs on:

1× H200 (141 GB) or 2× A100 80 GB
4× RTX 4090 with INT4 quantization (quality trade-off)

Zero network egress. Your hardware, your rules.

What about the preview version?

The preview checkpoint is effectively deprecated. OpenCode's gateway has switched to 0731. If you were relying on the preview via third-party hosts through OpenCode, that path is gone — at least until OpenCode adds non-China upstream proxies for the official release.

TL;DR

Approach	Data residency	Cost	Effort
Enable China toggle	China (PRC law)	$0.14/$0.28	1 click
DeepInfra/Fireworks/Novita direct	US/EU, ZDR	$0.09–$0.14 / $0.18–$0.28	New API key
Switch to MiMo-V2.5 on Go	Unknown (check per model)	$0.28	Model flag
Self-host	Your infra	GPU cost	High

What's next?

OpenCode may add non-China upstreams for 0731 (watch #39845)
Responses API support for deepseek-v4-flash on OpenCode is in testing
DeepSeek V4 Pro official release coming soon (separate model, separate hosting)

For now: if you need non-China data routing, use a direct provider API key instead of OpenCode Go for this model.

Full disclosure: This site uses OpenCode Go for the AI assistant on every page. The API key is set via OPENCODE_API_KEY in the deployment environment. As of today, we've switched the chat API to mimo-v2.5 (see commit) to avoid the China routing requirement.