VidaiMock
Open Source LLM Native Mock API Test Engine
VidaiMock launched on January 2, 2026 with 9 votes, #1,189 of 14,584 launches that month and more than 90% of that year's launches.
What it does
VidaiMock is a tiny, lightning-fast simulator that lets you test your AI apps without the expensive API bills. It emulates OpenAI, Anthropic, Gemini, and more with zero configuration. Built in Rust for maximum speed! ✅ Physics-Accurate Simulation: Emulates real-world wire protocols (Streaming) and token delivery timing. (Chaos testing) ✅ Truly Dynamic ✅ Instant-On, Zero Fixtures: A single ~7MB binary ✅ Deeply Extensible: Use Tera (Jinja2) templates to mock any proprietary or internal LLM API
A mock LLM API server to test AI agents in CI at zero cost. Wire-accurate streaming, errors and agentic loop termination for OpenAI, Anthropic and Gemini, offline and deterministic.
Vidai Community Edition is here. Free. No Expiry. Get started → Production-accurate streaming, errors and agent loops for every major provider, in CI. Deterministic, offline, no keys, no spend. # start the mock, run the suite, no keys, no spend $ docker run -d -p 8100:8100 ghcr.io/vidaiuk/vidaimock && pytest tests/agents/ agents/test_langgraph_loop.py .... [ tool loop terminates ] agents/test_openai_stream.py .. [ SSE wire-accurate ] agents/test_retry_on_429.py ... [ X-Mock-Status: 429 ] 23 passed in 1.84s · $0.00 spent · offline What it is Real AI failures are about wire format, timing and loop behaviour, not just status codes. VidaiMock emulates the exact streaming payloads and per-token…from vidai.uk
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