Does the $60 DeepSeek V4.1 Flash allowance rollover to the next month?

No. The $60 usage credit refreshes on the first day of each billing cycle and does not accumulate across months.

Can I use my personal DeepSeek API key instead of the Go plan quota?

Yes. In your config.json, change provider to deepseek-direct and provide your direct deepseek.com API key under api_key.

Intermediate · 7 minutes

How to Configure DeepSeek V4.1 Flash in OpenCode Go Plan and Fix HTTP 400 Errors

Step-by-step technical guide to activating your $60 monthly DeepSeek V4.1 Flash quota in OpenCode Go, configuring model parameters, and preventing HTTP 400 errors during multi-turn coding sessions.

Step 1: Upgrade OpenCode CLI to Version 1.14.2 or Higher

The model alias normalizer and tool reasoning trace bug fixes require OpenCode v1.14.2+. Run the self-update command to ensure your local binary carries the patch.

opencode update --channel=stable && opencode --version

Step 2: Authenticate OpenCode Go Subscription

Copy your Go subscription access token from the OpenCode settings portal and set it as your persistent environment variable.

export OPENCODE_API_KEY="opencode_go_live_xxxxxxxxxxxxxxxx"

Step 3: Configure config.json with Canonical Model Identifiers

Avoid custom shorthand strings like deepseek-v4-1-flash. Use the canonical deepseek/deepseek-v4.1-flash slug and set preserve_reasoning_trace to true so tool execution replies include thinking traces.

{
  "models": {
    "coding_agent": {
      "provider": "opencode-go",
      "model_id": "deepseek/deepseek-v4.1-flash",
      "preserve_reasoning_trace": true,
      "context_window": 1000000,
      "temperature": 0.2
    }
  }
}

Step 4: Verify Monthly Quota Balance and Latency

Query the OpenCode subscription endpoint to confirm your account displays the $60 DeepSeek allocation and check network round-trip time.

opencode quota --model=deepseek-v4.1-flash

Step 5: Run Multi-Turn Autonomous Codebase Audit

Run a multi-file verification test to confirm your agent receives tool-call returns without triggering HTTP 400 parameter errors.

opencode run "Analyze src/components for unused dependencies and run npm test"