New stealth model just dropped: Ox Alpha

A mysterious frontier model appeared on OpenRouter and OpenCode under the Stealth provider no company name, no official claim.

Try it while it’s free.

Key specs:
• 1,048,576-token context window
• Max output: 131k tokens
• Multimodal: text + image + video input
• Built for coding, long-horizon agentic work, and production workloads
• Tool calling supported
• Completely free for one week with generous (near-unlimited) rate limits
• Provider claims zero training on your prompts/completions during the test period.

Community fingerprinting is already pointing strongly toward a multimodal variant of Z.ai’s GLM-5.3 family (tokenizer matches almost perfectly, same API signature, reasoning modes, etc.).

Xiaomi’s MiMo team is the other main speculation, but the evidence currently leans GLM.

Early users are calling it genuinely frontier-level for coding and sustained agentic tasks fast, strong reasoning, and surprisingly polished.

No official benchmarks yet, but the real-world feedback is already heating up.