ZenMux review: pricing, free plan, Claude Code, vs OpenRouter

This page is built from ZenMux's own site, docs, terms, model list and GitHub, the domain registry, the official price pages of OpenAI, Anthropic and Google, and user reports on GitHub, V2EX, Hacker News and Product Hunt, all checked on October 21, 2026. ZenMux's claims are labelled as its own.

What ZenMux sells

ZenMux is an LLM gateway with three native request formats: OpenAI (https://zenmux.ai/api/v1, Chat Completions and Responses), Anthropic Messages (https://zenmux.ai/api/anthropic) and Vertex AI / Gemini (https://zenmux.ai/api/vertex-ai). Its quickstart says any model can be called through any of them. Its public model list held 206 models on October 21, 2026, weighted toward Chinese makers such as Qwen and Z.AI, next to Claude, GPT, Gemini, Grok and DeepSeek. Default routing prefers the model's own developer and fails over to other providers; for Claude these are Anthropic, Vertex AI and Amazon Bedrock. Callers can pin providers, set model fallbacks and give each key RPM, TPM and spend limits.

It sells two ways. Pay-as-you-go tops up from 5 USD to 25,000 USD by Stripe card or Alipay. The Builder Plan is a monthly subscription for personal, non-production coding, billed in "Flows" whose dollar value floats:

Plans allow 10 to 15 requests a minute, and ZenMux may lower the Flow value for accounts it judges abusive. Its headline extra is "AI insurance": ZenMux says it credits requests it judges to have poor output, hallucination or high latency the next day, with no claim to file.

Prices against the official APIs

Pay-as-you-go token prices match the makers' list prices for every model checked:

ZenMux prices come from its public model list. The margin is a 5% top-up service fee, which its promotions page says is waived for a limited time and returns when the promotion ends. Some providers of the same model are priced differently, and a few Chinese models have time-of-day pricing.

What public tests show

ZenMux has no public status page (status.zenmux.ai did not resolve), and no third-party latency or throughput benchmark of it was found. What exists:

• ZenMux's own counter (Analytics page, live October 21, 2026) showed 10,649 USD of insurance paid in total against about 11.5 trillion tokens processed since launch on September 29, 2025.
• ZenMux's own replay test (April 27, 2026) of a complaint about its cache hit rate against OpenRouter reports "no stable, persistent gap" without numbers.
• A Hacker News user (August 27, 2026) read both platforms' dashboards and saw a 98% DeepSeek V4 cache hit rate on ZenMux against 85% for the DeepSeek provider on OpenRouter. A dashboard reading, not a controlled test.
• GitHub issue #201 (April 20, 2026): with cache_control, Claude Sonnet 4.5 cached 1,816 tokens on the second call while Claude Opus 4.6 cached none on either call. Closed four days later.
• GitHub issue #297 (September 25, 2026): Claude pinned to the Amazon Bedrock route kept failing from September 18 to at least September 25, 2026, with no reply from ZenMux that week.

What users report

On July 27, 2026 all Claude routes returned an error saying the organization had been disabled, while GPT and GLM kept working (GitHub issue #267, closed the same day). In March 2026 ZenMux admitted double-billing cached tokens on seven Gemini models and credited users. An issue that streaming requests cancelled by the client are billed in full has been open since April 14, 2026.

A 43-reply V2EX thread from March 2026 is mostly negative about Builder Plan quotas, refunds after usage and slow email support; quotas have changed since. On Product Hunt (third of the day on February 13, 2026, no written reviews), the makers said insurance thresholds are still being tuned. Trustpilot has one one-star review.

MCP, Agent Skills and coding agents

No official MCP server was found in ZenMux's docs. Its Responses API reference lists remote MCP tools (type mcp, with server URL and allowed tools) "if enabled", and its tool-calling guide says Responses requests can carry MCP tools.

ZenMux does publish official Agent Skills: the ZenMux/skills repository, installed with npx skills add ZenMux/skills. Its skills answer questions from ZenMux's docs (zenmux-context), walk through tool setup (zenmux-setup), read quota, balance and per-request cost through the Management API (zenmux-usage), file GitHub issues (zenmux-feedback), add a Claude Code status line (zenmux-statusline) and generate images (zenmux-image-generation), plus two smaller ones. Anthropic's Skills API through its Messages endpoint is not documented.

Its docs have setup guides for Claude Code, Claude Desktop, Codex, Cursor, Cline, Gemini CLI, GitHub Copilot, OpenCode, Pi, Neovate Code, DeepSeek Harness, Hermes Agent and OpenClaw. Its GitHub has OAuth sign-in provider plugins for Codex, opencode, Pi and Hermes Agent. For Claude Code, you set ANTHROPIC_BASE_URL to https://zenmux.ai/api/anthropic and ANTHROPIC_AUTH_TOKEN to a ZenMux key; the guide says subscription keys must not be used in production. Code uses the OpenAI, Anthropic and Google GenAI SDKs as they are, and the docs have an llms.txt index.

Privacy, terms and who runs it

• Operator: the terms (effective September 9, 2026) and privacy policy name NexaMind Singapore Pte. Ltd., 11 Collyer Quay, Singapore. A March 10, 2026 notice named AI Force Singapore Pte. Ltd., and the home-page footer still showed that name on October 21, 2026.
• Domain: the registry lists the registrant of zenmux.ai, created July 31, 2025, as Advanced New Technologies Co., Ltd., an Ant Group IP company, in the Cayman Islands, with an antfin.com contact address.
• Ant Group links: ZenMux launched Ant's Ling-1T model in October 2025, and Ant's Ling developer site publishes a guide to using Ring-1T with Claude Code through ZenMux. No page found states who owns NexaMind Singapore Pte. Ltd.
• Claude Code: a June 2026 analysis of Claude Code 2.1.196 by thereallo.dev found zenmux.ai on a list of base-URL domains that change a hidden marker in Claude Code's system prompt; the author believes the marker helps Anthropic spot resellers.
• Data: by default ZenMux stores request content, which insurance claims need; turning off Data Services gives zero retention and no insurance. Usage records are kept 180 days. The privacy policy says ZenMux "may store, transfer or train on your anonymized User Content" and may share data with affiliates. Data is stored in Singapore; some is processed in Malaysia. Its compliance page lists SOC 2, ISO 27001 and GDPR as "In progress"; footers show the badges.
• Refunds: only within 24 hours of a top-up or subscription, minus usage and a 5% fee; bonus credits are forfeited. Singapore law applies.

How it compares with other relays

OpenRouter also bills at list prices, plus 5.5% on credit purchases, and has more independent coverage. NanoGPT charges list prices with no deposit fee and has a 12 USD plan for open-weight models. CometAPI sells at 0.8 times list but names no company, and AIMLAPI charges about 1.3 times list. ZenMux's extras are the insurance credits, official Agent Skills and the coding subscription.

Who should skip it

Anyone whose product depends on steady Claude access, anyone who needs to know who owns their supplier, and anyone who wants refunds after the first day. The Builder Plan is not for production use under ZenMux's own rules.