StepAudio 2.5 TTS
stepfun/stepaudio-2-5-ttsBy StepFun · family: step · released 2026-04-16
Prices in USD per 1M tokens. Unknown means the provider does not publish per-token pricing.
Capabilities
Model fit scores
0–100 · higher is betterThese scores reward declared capabilities, context size, price and provider availability — they are not benchmark results. Use them as a directional signal alongside your own evaluation.
Coding1
- Tool calling0/40
- Structured output0/20
- Reasoning0/10
- Context window (100K → 1M)0/20
- Provider availability1/10
Agents1
- Tool calling0/35
- Structured output0/25
- Reasoning0/15
- Output token limit0/15
- Provider availability1/10
JSON / structured output0
- Structured output / JSON mode0/50
- Tool calling0/20
- Temperature control0/10
- Price-friendly for high-volume0/20
Cost efficiency0
- Has published price0/100
Long context0
- Context ≥ 100K0/100
Production-readiness30
- Number of independent providers5/40
- Has published per-token price0/20
- Context window ≥ 8K0/15
- No data inconsistencies across providers10/10
- Official model (not derivative)15/15
Cost Efficiency Index
Open full calculator →Estimated cost using the recommended provider's headline rate. Each scenario fixes average input/output tokens — the assumptions are shown in the third column.
This model has no published per-token price, so we can't compute a cost estimate. See the provider's official pricing page for current rates.
Available on 1 providers
| Provider | Provider model id | Input / 1M | Output / 1M | Context | Released |
|---|---|---|---|---|---|
| StepFun stepfun | stepaudio-2.5-tts | Unknown | Unknown | Unknown | 2026-04-16 |
Frequently asked questions
How much does StepAudio 2.5 TTS cost?
StepAudio 2.5 TTS does not have a publicly published per-token price in our data source. This usually means it is gated behind enterprise sales or invite access. Check StepFun's official pricing page for the most current rates.
Does StepAudio 2.5 TTS support tool calling?
No. StepAudio 2.5 TTS does not support tool calling (function calling). If your workflow requires it, look at the /capabilities/tool-calling list for alternatives.
Does StepAudio 2.5 TTS support structured output / JSON mode?
Support for structured output / JSON-schema-constrained decoding is not reported for StepAudio 2.5 TTS in our data source. Verify with StepFun's official documentation before relying on it in production.
Can StepAudio 2.5 TTS accept image input?
No. StepAudio 2.5 TTS only accepts text as input. If you need image input, see our /capabilities/vision list for current vision-capable models.
Is StepAudio 2.5 TTS open-weight?
No. StepAudio 2.5 TTS is a proprietary model — only StepFun (and any approved hosting partners) can serve it. The pricing above reflects the cheapest API access.
What are the best alternatives to StepAudio 2.5 TTS?
If StepAudio 2.5 TTS doesn't fit, consider Step 3.5 Flash, Step 3.7 Flash, Step 3.5 Flash 2603. Each one targets the same use case — see the Related links below for direct head-to-head pages.
Where does this data come from?
All numbers are normalised into a single canonical model record and reconciled with each provider's official documentation. We re-pull daily and write any changes (price, context, capability) to the /changelog page.
Explore more
More StepFun models
- Step 3.5 Flash$0.10 in / $0.30 out
- Step 3.7 Flash$0.20 in / $1.15 out
- Step 3.5 Flash 2603$0.10 in / $0.30 out
- Step 1 (32K)$2.05 in / $9.59 out
- StepAudio 2.5 ASRUnknown pricing
Last updated:
Pricing and capabilities are refreshed daily and reconciled against each provider's official documentation. Always verify critical production decisions with the provider directly.