{"model":"fish-audio-s2-1-pro","air":"fishaudio:s2.1@pro","name":"Fish Audio S2.1 Pro","creator":"fish-audio","status":"live","releasedAt":"2026-06-01T00:00:00","weight":5,"headline":"Flagship multilingual text-to-speech with natural language voice control and realtime streaming","description":"Fish Audio S2.1 Pro is a flagship text-to-speech model built for highly expressive, low-latency speech generation. It supports natural-language bracket cues for emotion and delivery control, multi-speaker dialogue in a single generation, 80+ languages with automatic language detection, and realtime streaming with very fast time to first audio.","capabilities":["io:text-to-audio","io:audio-to-audio","form:checkpoint"],"coverImage":"https://assets.runware.ai/covers/fish-audio-s2-1-pro.jpg","ogImage":"https://assets.runware.ai/og/fish-audio-s2-1-pro.png","pricingOverview":"Pricing is based on the size of input text, measured in millions of UTF-8 bytes. ","pricingRates":[{"amount":0.000015,"unit":"utf8Byte"}],"pricingExamples":[{"configuration":"multi-speaker-dialogue","price":"$0.00356","latencyMs":3688,"exampleId":"midnight-cinema-channel-vocal-stinger"},{"configuration":"text-to-audio","price":"$0.0168","latencyMs":13740,"exampleId":"reservoir-science-podcast-cold-open"},{"configuration":"voice-cloning","price":"$0.0171","latencyMs":18082,"exampleId":"bronze-bell-inspection-course-narration"},{"configuration":"text-to-audio","price":"$0.0227","latencyMs":20299,"exampleId":"forensic-entomology-training-narration"}],"guides":[{"slug":"emotion-and-expression","title":"Emotion and expression control","description":"How to control vocal delivery in Fish Audio S2-Pro with bracket tags. The tag system steers emotion, expression, paralanguage, and phoneme-level pronunciation in one inline syntax.","date":"2026-06-01","url":"https://runware.ai/docs/models/fish-audio-s2-1-pro/guides/emotion-and-expression"},{"slug":"multi-speaker-dialogue","title":"Multi-speaker dialogue","description":"How to generate two-speaker dialogue audio in a single request to Fish Audio S2-Pro using inline speaker tags. One call, two voices, full per-speaker emotion control.","date":"2026-06-01","url":"https://runware.ai/docs/models/fish-audio-s2-1-pro/guides/multi-speaker-dialogue"}]}