Thesean - 2026 Pricing, Features, Reviews & Alternatives

Martian is an AI research and tooling platform centered on LLM interpretability and intelligent model routing. Its flagship product, the Martian Gateway, provides unified API access to 200+ large language models across major providers through a single endpoint compatible with OpenAI and Anthropic interfaces. A built-in LLM model router evaluates each incoming prompt and routes it to the optimal model based on configurable cost-quality tradeoffs, predicting model performance without executing the request first. Automatic failover reroutes traffic to alternative providers during outages or high-latency periods, maintaining continuity without manual intervention. Integration requires a single line of code, and bring-your-own API key support is available for teams already holding provider accounts.

Beyond routing, Martian offers additional tooling grounded in mechanistic interpretability research. ARES (Agentic Research and Evaluation Suite) is a reinforcement learning framework for training and evaluating LLM agents, treating model requests as observations and responses as actions, with particular application to code generation. K-Steering enables inference-time behavior control by modifying model activations directly, without fine-tuning. Custom routers can be trained on customer-specific datasets and user behavior to optimize routing for particular task profiles. A web-based dashboard provides real-time usage tracking, model performance monitoring, and full request history.

Martian serves a broad range of customers, from individual developers on self-serve plans to Fortune 500 enterprises on customized deployments. Target industries include telecommunications, customer service, software development, and enterprise AI applications. Interpretability-based research, including identification and mitigation of Chain-of-Thought Hijacking developed in collaboration with researchers from Stanford, Oxford, and Anthropic, underpins the platform's approach to principled model behavior control.