Fish Audio models now available on Vercel AI Gateway for free

What happened

Fish Audio models now available on Vercel AI Gateway for free

Vercel has added Fish Audio's audio models to its AI Gateway, giving developers a unified interface through which to access text-to-speech and related audio capabilities alongside the other model providers already supported on the platform. To mark the launch, Vercel is making every Fish Audio model on AI Gateway free for the next 30 days, a promotional window that runs through September 18.

This article walks through what shipped, how the pricing structure works during and after the promotional period, what builders need to do to start using Fish Audio through the gateway, and what edge cases to keep in mind before wiring these models into production. If you are building voice interfaces, content pipelines, or any product that consumes audio generation, this integration is directly relevant to your stack.

What shipped

How it works

Fish Audio's audio models are now reachable through Vercel AI Gateway, which acts as a proxy and management layer sitting between your application and upstream model providers. The addition means developers can call Fish Audio's text-to-speech models using the same gateway configuration, API key management, and observability tooling they already use for other providers on the platform. The integration went live with the promotional pricing period already active, so the effective cost from launch day through September 18 is zero for any Fish Audio model routed through the gateway.

The move extends AI Gateway's audio coverage without requiring developers to maintain a separate Fish Audio account or manage credentials outside of Vercel's infrastructure. For teams already standardized on AI Gateway as their model-routing layer, Fish Audio becomes a first-class option alongside existing text and multimodal providers.

What changed for builders

The most immediate change is pricing access. Text-to-speech through Fish Audio on AI Gateway carries a standard rate of $15.00 per milli-unit outside the promotional window. During the free period ending September 18, that cost drops to zero, which makes now a practical time to prototype, benchmark, and load-test audio pipelines without accumulating spend. Builders should treat this window as an integration and validation sprint rather than a reason to defer production planning.

Why it matters

Beyond pricing, the architectural change is that Fish Audio requests now flow through Vercel's gateway layer, which means they inherit whatever request logging, rate-limit configuration, and routing logic you have already set up. If your gateway has per-model spending caps or observability hooks, those will apply to Fish Audio calls the same way they apply to any other provider. Builders should audit those settings before the promotional period ends to avoid surprises when billing resumes at the standard rate.

How to install or upgrade

If you are already using Vercel AI Gateway, no SDK upgrade or infrastructure change is required to access Fish Audio. The models are available in the gateway's provider list and can be selected through the same configuration surface you use for other providers. You will need to enable the Fish Audio provider in your gateway settings and confirm that your project's AI Gateway configuration includes the appropriate model identifiers for the Fish Audio models you intend to use.

Who is affected

For teams not yet on AI Gateway, the starting point is the Vercel dashboard, where AI Gateway can be enabled for a project. From there, adding Fish Audio follows the same onboarding flow as any other provider integration. There are no client-library changes required on the application side beyond updating the model target in your existing gateway-routed requests.

Gotchas and compatibility

The 30-day free window expires on September 18, and billing at the standard $15.00 per milli-unit rate resumes automatically on that date. There is no indication that a manual opt-in is required to continue using Fish Audio after the promotion ends, which means any production workloads you stand up during the free period will begin incurring costs without an explicit cutover step. Set a calendar reminder and review your usage metrics before that date so you can make an informed decision about volume and spend.

Because the integration routes through AI Gateway rather than directly to Fish Audio's own API, any latency overhead from the gateway proxy layer will apply. If you have strict latency requirements for real-time voice applications, benchmark your gateway-routed calls against the direct Fish Audio API during the free window. Also verify that the specific Fish Audio models available through the gateway match the ones your use case requires, since gateway availability may not map one-to-one with Fish Audio's full model catalog.

What to watch next

What to watch next

The immediate thing to monitor is whether Vercel expands the promotional model to other audio or media providers, given that Fish Audio's launch was paired with a free-access incentive that suggests a pattern for onboarding new capability categories. Watch the AI Gateway provider list for additions in the audio, speech-to-text, or music generation space over the coming weeks, as the Fish Audio integration may signal a broader push into non-text modalities.

Longer term, pay attention to how Vercel surfaces per-provider usage breakdowns in AI Gateway's observability tooling. As audio models carry different cost structures than token-priced text models, the metrics and alerting you have configured for text workloads may not translate cleanly to audio billing. Before September 18, confirm that your cost-monitoring setup can track Fish Audio consumption at the granularity you need to manage spend once the standard rate applies.