Announcements and Blog

OpenRouter Raises $113M Series B

OpenRouter has raised a $113M Series B led by CapitalG, with participation from NVentures, ServiceNow Ventures, MongoDB Ventures, Snowflake Ventures, Databricks Ventures, AMP PBC, and Pace Capital, alongside existing investors Andreessen Horowitz and Menlo Ventures.

May 28, 2026

Human-in-the-Loop Tools for the Agent SDK

A new tool type in the OpenRouter Agent SDK lets your agent auto-resolve routine decisions and pause for human input on high-stakes ones, with two hooks and zero loop-management code.

May 8, 2026

Consistent Web Search and Fetch Across Every Model

Give any tool-calling model the ability to search the web and fetch page content on its own, with multiple search engines and fetch engines to choose from.

May 7, 2026

GPT-5.5 Price Increase: What It Actually Costs

OpenAI doubled per-token prices with GPT-5.5 but the model is less verbose. We measured real usage to see the net cost impact.

May 4, 2026

New Audio APIs for Speech and Transcription

Text-to-speech and transcription are now live on OpenRouter. Two new endpoints give you access to speech synthesis and audio transcription across multiple providers, under one API.

May 1, 2026

Response Caching: Zero Cost for Identical Requests

Introducing the new Response Caching header: enables caching identical API requests so responses come back in a tiny fraction of the time, at zero cost.

April 30, 2026

April Release Spotlight

Video generation, workspaces, an agent SDK, reranker models, and a wave of frontier model launches.

April 30, 2026

Create OpenRouter Accounts via CLI with Stripe Projects

Run `stripe projects add openrouter/api` to get an OpenRouter account, an API key, and Stripe billing, all from the command line. Your agents can do it too.

April 29, 2026

Opus 4.7's New Tokenizer: What It Actually Costs

Anthropic changed the tokenizer in Opus 4.7. We looked at usage that shifted from 4.6 to 4.7 to measure exactly how it affects costs.

April 27, 2026

Build Your Own Harness with the Agent SDK

Use the create-agent-tui and create-headless-agent skills to scaffold a personalized coding agent in minutes — with a terminal UI or headless for scripts and pipelines.

April 24, 2026

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