StepFun
StepFun
Speech model · China ·Apr 2026

Step-Audio-R1.5

Speech Open Weights

About Step-Audio-R1.5

Step-Audio-R1.5 is an AI model developed by StepFun, in the speech category, released in 2026, made available as an open-weights model. An audio reasoning large language model, successor to Step-Audio-R1, that shifts from Reinforcement Learning with Verifi.

On this page you'll find Step-Audio-R1.5's full specifications. Review provider pricing and benchmark scores below, or compare Step-Audio-R1.5 head-to-head with other speech models.

→ More models by StepFun → All speech models → AI benchmarks leaderboard

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Frequently asked questions

What is Step-Audio-R1.5? ▶

An audio reasoning large language model, successor to Step-Audio-R1, that shifts from Reinforcement Learning with Verifi It is tracked on GenAIList with its specifications, benchmark scores and provider pricing.

Who created Step-Audio-R1.5? ▶

Step-Audio-R1.5 was developed by StepFun and released in 2026.

Is Step-Audio-R1.5 open source or proprietary? ▶

Step-Audio-R1.5 ships as an open-weights model: you can download and self-host the weights, though the licence may place some restrictions on use.

How much does Step-Audio-R1.5 cost? ▶

Pricing for Step-Audio-R1.5 depends on the provider. See the providers table on this page for the latest API rates.

How does Step-Audio-R1.5 perform on benchmarks? ▶

Benchmark scores for Step-Audio-R1.5 are listed on this page as they are published. You can compare it head-to-head with other models on the GenAIList compare tool.

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