Pioneer

Pioneer, made by Fastino Labs (also known as Fastino Inc.), is an inference API that intelligently routes requests to the best-performing model and automatically improves models through adaptive inference on production traffic. It offers model routing as a drop-in replacement for OpenAI with access to more than 70 models including Claude, GPT-5.5, Gemma, and DeepSeek, and adaptive inference that mines failures for high-signal examples and surfaces an improved model behind the same URL. Pioneer includes an observability dashboard that automatically clusters failures by task and failure mode with example inputs and outputs, continuous improvement where models retrain on live production data with automatically generated reports, and a developer experience requiring only a single-line code change, supporting streaming, tool calls, and structured outputs. Pricing is pay-per-token with included improvements: rates vary by model (for example, Gemma 4 at $0.25 per million tokens, GPT-5.5 at $5.00 per million), with retraining costs starting at $0 per retrain since improvement is bundled into inference pricing. The service reports a 99.99% uptime SLA and roughly 30% average accuracy lift on classification tasks in early results.