ProjectsJuly 9, 2026

opencode-sub2api-haiku-fix

Overview

opencode-sub2api-haiku-fix is a deliberately small OpenCode plugin for one failure mode: Claude Haiku requests through Sub2API returning "You're out of extra usage" while Opus and Sonnet work on the same route. The fix stays local to the plugin. It does not fork Sub2API, patch OpenCode core, or modify OMO. Instead, it rewrites only Haiku requests into the Claude Code-style wire shape that this OAuth route expects.

What It Fixes

Preserves Haiku manual thinking.
Rebuilds the final request body into a 3-block Claude Code-style system shape.
Moves the original OpenCode system prompt into the opening messages so local instructions survive the rewrite.
Adds Claude Code-style metadata and request/session IDs.
Leaves Sonnet and Opus untouched.

Verification

The launch build was verified with the local test suite and a live OpenCode smoke test:

Bash

npm test
opencode run -m anthropic/claude-haiku-4-5-20251001 "Reply OK only."

The smoke test returned OK, and Sub2API recorded a successful Haiku usage row after the earlier extra-usage errors stopped.

中文简介

opencode-sub2api-haiku-fix 是一个只解决一个问题的 OpenCode 插件：同一个 Sub2API 路由下，Opus 和 Sonnet 可以正常工作，但 Haiku 报「You're out of extra usage」。这个错误在该场景里不是额度结论，而是 Haiku 请求形状不够像 Claude Code。插件只在 OpenCode 侧修正 Haiku 请求，不改 Sub2API、不改 OpenCode core、不改 OMO。

具体修复

保住 Haiku manual thinking。
将最终请求改成 Claude Code 风格三段 system。
将原始 OpenCode system prompt 移入开头 messages，避免本地指令丢失。
补齐 Claude Code 风格 metadata、request ID 和 session ID。
对非 Haiku 模型提前退出，不影响 Sonnet 和 Opus。

该项目适合已经使用 Sub2API + OpenCode，并且希望保持后端可持续更新、不维护私有 Sub2API fork 的用户。

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opencode-sub2api-haiku-fix

Overview

What It Fixes

Verification

中文简介

具体修复

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