As recorded at collection: U2 Flash API, free calls for new and existing users

This deal lets both new and existing users make free calls to the U2 Flash model offered on the official Unisound MaaS site. The model ID is u2-flash. The author says the model handles requests well and responds at about 50 to 70 tokens per second. The official information lists a 1M conversation context, 128000 output, and reasoning levels of off, minimal, low, nedium, high, and xhigh.

Go to maas.unisound.com, sign up, and complete the real-name verification process described in the original post. Create a pay-as-you-go API key (an authentication string required to use the service) to call U2 Flash. It says you can connect using OpenAI Completions or OpenAI Responses, and that Anthropic mode is also supported, though the author says they have not tested that mode.

The free offering is limited to the event period, but the original text does not specify an exact end date. It applies to both new and existing users, and the original text explains that there are few separate restrictions on the model. It also notes that if a request does not work, it may be due to agent limitations.