Inference API
Provider 
Founded 2026
Sells To Developers, Enterprise
Pricing Model Usage-based
Ownership Venture-backed private company

Async inference API for long-horizon AI agents, serving leading open-source models through OpenAI- and Anthropic-compatible endpoints.
Sail's inference API runs leading open-source models behind OpenAI- and Anthropic-compatible Responses, Chat Completions, and Messages endpoints, so existing agent code can migrate with minimal change. A per-request completion window lets callers trade response latency for token price, with background tiers priced well below immediate-response options.
Self-serve users start with monthly free credits and prepaid usage-based billing, while enterprise customers contract for volume pricing, HIPAA-region isolation, and uptime SLAs. The platform targets asynchronous, long-running agent workloads such as deep research, code review, and evaluation pipelines.
Tracer

Echo
tracerml.ai
Fireworks AI

Fireworks AI Inference
fireworks.ai
Together AI

Together AI Inference
together.ai
| Attribute | Inference API | Echo | Fireworks AI Inference | Together AI Inference | |
|---|---|---|---|---|---|
| Provider | |||||
| Founded | 2026 | 2026 | 2022 | 2022 | |
| Sells To | Developers, Enterprise | Enterprise | Enterprise | Enterprise | |
| Pricing Model | Usage-based | B2B Subscription | Recurring | Recurring | |
| Ownership | Venture-backed private company | Private | Venture Capital | Venture Capital |
Provider 
Founded 2026
Sells To Developers, Enterprise
Pricing Model Usage-based
Ownership Venture-backed private company
Provider 
Founded 2026
Sells To Enterprise
Pricing Model B2B Subscription
Ownership Private
Provider 
Founded 2022
Sells To Enterprise
Pricing Model Recurring
Ownership Venture Capital
Provider 
Founded 2022
Sells To Enterprise
Pricing Model Recurring
Ownership Venture Capital