feat(opencode-zen): add OpenCode Zen (PAYG) provider with free-tier fingerprint, alias ocz
Multi-endpoint provider on https://opencode.ai/zen/v1 (openai / claude / openai-responses transports mirroring opencode-go) with 71 models across paid + free tiers. Free-tier fingerprint: opencode/1.18.x UA spoof, ses_-session header, built-in tool quartet, forced stream. Usage endpoint /zen/v1/usage wired into the dashboard.
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Alexander Radchenko
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tests/unit/opencode-zen-models.test.js
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tests/unit/opencode-zen-models.test.js
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import { describe, expect, it } from "vitest";
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import { PROVIDER_MODELS, getModelSupportedFormats } from "../../open-sse/config/providerModels.js";
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import { PROVIDERS } from "../../open-sse/config/providers.js";
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import { resolveTransport } from "../../open-sse/services/provider.js";
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// Chat-only models (no /messages, no /responses support on opencode-zen)
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const CHAT_ONLY = ["deepseek-v4-pro", "deepseek-v4-flash", "deepseek-v4-flash-vision-exp",
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"glm-5.3-flash", "glm-5.3", "glm-5.2", "glm-5.1", "glm-5",
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"minimax-m3", "minimax-m2.7", "minimax-m2.5",
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"kimi-k3", "kimi-k2.7-code", "kimi-k2.6", "kimi-k2.5",
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"big-pickle", "deepseek-v4-flash-free",
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"mimo-v2.5-free", "ling-3.0-flash-fin-free", "nemotron-3-ultra-free", "nemotron-3.5-lightning-free"];
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// Models that also expose the Anthropic /messages endpoint
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const CLAUDE_CAPABLE = ["claude-fable-5", "claude-fable-5-1", "claude-opus-5",
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"claude-opus-4-8", "claude-opus-4-7", "claude-opus-4-6", "claude-opus-4-5",
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"claude-sonnet-5", "claude-sonnet-4-6", "claude-sonnet-4-5", "claude-sonnet-4",
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"claude-haiku-4-5", "qwen3.6-plus", "qwen3.5-plus", "union-alpha"];
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// Models that also expose the OpenAI /responses endpoint
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const RESPONSES_CAPABLE = ["gpt-6-astra",
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"gpt-5.6-sol", "gpt-5.6-terra", "gpt-5.6-luna",
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"gpt-5.5", "gpt-5.5-pro",
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"gpt-5.4", "gpt-5.4-pro", "gpt-5.4-mini", "gpt-5.4-nano",
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"gpt-5.3-codex-spark", "gpt-5.3-codex",
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"gpt-5.2", "gpt-5.2-codex",
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"gpt-5.1", "gpt-5.1-codex-max", "gpt-5.1-codex", "gpt-5.1-codex-mini",
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"gpt-5", "gpt-5-codex", "gpt-5-nano",
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"grok-build-0.1", "grok-4.6", "grok-4.5",
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"muse-spark-1.3", "muse-spark-1.2",
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"muse-spark-1.3-contributor-free", "muse-spark-1.2-contributor-free"];
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// Mirror of chatCore's per-model transport guard: use the sourceFormat-matched
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// transport only when the model declares support for that sourceFormat.
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function pickTransport(provider, sourceFormat, alias, model) {
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const supported = getModelSupportedFormats(alias, model);
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const rt = resolveTransport(provider, sourceFormat);
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return supported?.includes(sourceFormat) ? rt : null;
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}
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describe("OpenCode Zen model catalog", () => {
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it("matches the documented model IDs", () => {
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const ids = (PROVIDER_MODELS["ocz"] || []).map((m) => m.id);
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expect(ids).toContain("muse-spark-1.3-contributor-free");
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expect(ids).toContain("gpt-5.5");
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expect(ids).toContain("claude-opus-5");
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expect(ids).toContain("kimi-k3");
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expect(ids).toContain("deepseek-v4-pro");
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expect(ids.length).toBeGreaterThan(60);
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});
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});
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describe("OpenCode Zen per-model supportedFormats", () => {
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it("declares [claude] for Claude + Qwen + union-alpha models", () => {
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for (const m of CLAUDE_CAPABLE) {
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expect(getModelSupportedFormats("ocz", m)).toEqual(["claude"]);
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}
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});
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it("declares [openai-responses] for GPT/Grok/Spark responses models", () => {
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for (const m of RESPONSES_CAPABLE) {
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expect(getModelSupportedFormats("ocz", m)).toEqual(["openai-responses"]);
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}
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});
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it("declares [openai] only for chat-only models (GLM/Kimi/MiMo) → guards /messages routing", () => {
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for (const m of CHAT_ONLY) {
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expect(getModelSupportedFormats("ocz", m)).toEqual(["openai"]);
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}
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});
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});
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describe("OpenCode Zen multi-endpoint transports", () => {
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it("declares openai / claude / openai-responses transports", () => {
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const formats = (PROVIDERS["opencode-zen"].transports || []).map((t) => t.format);
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expect(formats).toEqual(["openai", "claude", "openai-responses"]);
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});
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it("resolveTransport picks the endpoint matching the client sourceFormat", () => {
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expect(resolveTransport("opencode-zen", "claude").baseUrl).toBe("https://opencode.ai/zen/v1/messages");
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expect(resolveTransport("opencode-zen", "openai-responses").baseUrl).toBe("https://opencode.ai/zen/v1/responses");
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expect(resolveTransport("opencode-zen", "openai").baseUrl).toBe("https://opencode.ai/zen/v1/chat/completions");
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});
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it("uses x-api-key + anthropicVersion on the claude transport", () => {
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const t = resolveTransport("opencode-zen", "claude");
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expect(t.auth.header).toBe("x-api-key");
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expect(t.auth.anthropicVersion).toBe(true);
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});
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});
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describe("OpenCode Zen per-model transport guard (chatCore logic)", () => {
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it("routes MiniMax/Qwen + claude-format client to /messages", () => {
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for (const m of CLAUDE_CAPABLE) {
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expect(pickTransport("opencode-zen", "claude", "ocz", m)?.baseUrl).toBe("https://opencode.ai/zen/v1/messages");
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}
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});
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it("does NOT route chat-only models to /messages on a claude-format request", () => {
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for (const m of CHAT_ONLY) {
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expect(pickTransport("opencode-zen", "claude", "ocz", m)).toBeNull();
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}
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});
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it("routes DeepSeek + responses-format client to /responses", () => {
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for (const m of RESPONSES_CAPABLE) {
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expect(pickTransport("opencode-zen", "openai-responses", "ocz", m)?.baseUrl).toBe("https://opencode.ai/zen/v1/responses");
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}
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});
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it("routes Muse Spark (responses-only) to /responses, never to /messages", () => {
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for (const m of ["muse-spark-1.2", "muse-spark-1.3", "muse-spark-1.2-contributor-free", "muse-spark-1.3-contributor-free", "grok-4.6", "gpt-5.6-luna"]) {
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expect(getModelSupportedFormats("ocz", m)).toEqual(["openai-responses"]);
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expect(pickTransport("opencode-zen", "openai-responses", "ocz", m)?.baseUrl).toBe("https://opencode.ai/zen/v1/responses");
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expect(pickTransport("opencode-zen", "claude", "ocz", m)).toBeNull();
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expect(pickTransport("opencode-zen", "openai", "ocz", m)).toBeNull();
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}
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});
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it("does NOT route MiniMax (no responses support) to /responses", () => {
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for (const m of CLAUDE_CAPABLE) {
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expect(pickTransport("opencode-zen", "openai-responses", "ocz", m)).toBeNull();
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}
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});
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});
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