OpenCode Requested to Support Responses API for DeepSeek V4 Flash
YiRan0 · ghdev · 2026-07-31
A developer filed an issue requesting opencode-go to add support for the Responses API on DeepSeek's latest deepseek-v4-flash-0731 checkpoint.
Background & Issue
DeepSeek's official checkpoint natively supports the OpenAI Responses API protocol. However, calling this endpoint via opencode-go currently returns an HTTP 400 upstream failure. This blocks Codex-style clients relying on the Responses protocol from using DeepSeek V4 Flash through OpenCode (while the same endpoint works fine for GPT-5.x models).
Proposed Behavior
- Switch the deepseek-v4-flash upstream to the 0731 checkpoint supporting the Responses API
- Forward /v1/responses requests for this model to the upstream Responses endpoint
- Maintain backwards compatibility for /v1/chat/completions
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