Martian vs. AssemblyAI

Martian is primarily a model router that predicts the cheapest model able to hit your quality bar and routes each prompt accordingly, now paired with a 200+-model gateway. AssemblyAI’s LLM Gateway is a fully managed access and governance layer over a curated model set, with native speech-to-text in the same pipeline. Choose AssemblyAI for managed model access, audio, and documented governance; choose Martian when automatic cost/quality routing is your main goal.

AssemblyAI, because it runs its own speech-to-text models and applies any LLM to the transcript in one pipeline—no second vendor and no extra network hop. Martian has no native speech or audio, so a voice pipeline would need a separate transcription vendor on top of it.

AssemblyAI passes through provider token rates at 0% markup. Martian is usage-metered and its token-markup policy is not clearly documented publicly, so confirm current pricing with Martian directly. Both are OpenAI-SDK compatible, so switching between them is a base-URL and model-string change.

Yes—Martian’s automatic cost/quality routing, which estimates a model’s output quality before running it to pick the cheapest option that clears your bar, is a genuinely novel strength for teams optimizing spend. AssemblyAI’s advantage is different: a managed gateway with native speech, per-model fallbacks, and default-on data governance.

With AssemblyAI, yes—EU residency is on by default for EU traffic, zero data retention is available per request, and a Business Associate Addendum (BAA) is available for workloads that process PHI, backed by SOC 2 Type 2 and ISO 27001. Martian does not publicly document SOC 2, HIPAA/BAA, EU residency, or a zero-data-retention mode, so regulated workloads should verify its posture directly.

Yes. Point any OpenAI SDK at the Gateway, change the base URL and model string, and your code works unchanged. Martian is also OpenAI- and Anthropic-compatible, so either is a drop-in from the OpenAI SDK’s perspective.