Opper AI launched Claude Fable 5.1 on the Opper AI Gateway, featuring a 1M token context window and available routes including Anthropic direct, GCP, and Azure.

Opper is the AI gateway for agents. One LLM router for 700+ frontier and open-weight models from Anthropic, OpenAI, Google, Mistral, Meta, xAI, and others, accessible through a single API with full OpenAI SDK compatibility. The LLM Gateway is the routing layer: change one line of code to switch providers, add intelligent fallbacks for uptime, and pin to EU-resident infrastructure when residency matters. All without rewriting your application or running your own inference stack. The AI Agent Control Plane sits above the gateway and gives teams full visibility and control over every AI call in production. Distributed tracing, online evaluation, scoring, prompt optimization, and per-call cost tracking. The same code that ships is the code you can debug, score, and improve over time. Trusted by 50,000+ developers and companies serving more than 10 million end users, from regulated fintech to consumer AI products. Get started at opper.ai Docs: docs.opper.ai