KymaKyma
ElevenLabs

ElevenLabs

ElevenLabs Flash v2.5

ElevenLabs Flash v2.5 is a text-to-speech model optimized for ultra-low-latency audio generation. Developers building real-time voice agents or interactive conversational interfaces should use it when sub-100ms time-to-first-byte is required.

Modalities

Text → Audio

Price

$0.2025 / 1K char

Speed

fast

Performance

Live production data from real requests on Kyma — not synthetic benchmarks.

Rank

#66

of 87 active models

Tokens served

112

all-time

Total requests133
Platform share0.0%

Pricing

Per 1,000 characters of input text. Billed on successful synthesis.

$0.2025 / 1K char

When to use ElevenLabs Flash v2.5

Updated 2026-07-31

Where this model earns its cost — and where it doesn't.

This model converts text input into spoken audio across 32 languages. It operates on a per-character billing model and delivers audio with a time-to-first-byte of approximately 75ms, operating at half the per-character cost of the Multilingual v2 variant.

On Kyma, requests are routed through an OpenAI-compatible endpoint with automatic failover to maintain delivery. Prompt caching applies to repeated text prefixes, reducing input costs by 90%. Usage metrics return exact character costs in the response payload, and the X-Kyma-Model header confirms the executing model.

The model is strictly for speech synthesis and does not support reasoning, vision, or structured output formats. It is optimized for speed and cost efficiency rather than maximum vocal fidelity, and it processes text inputs up to a 5000-token context window.

Real-Time Voice Agents

Generates conversational audio with sub-100ms latency for interactive AI assistants.

Low-Latency Narration

Streams spoken content quickly for dynamic reading applications.

Cost-Optimized TTS

Reduces synthesis expenses for high-volume text-to-speech workloads.

Multilingual Conversational AI

Supports voice generation across 32 languages for global user bases.

Not ideal for: Do not use this model for applications requiring studio-grade vocal fidelity, complex emotional prosody, or non-speech audio generation.

Quick start

Up and running in under two minutes.

  1. 1

    Create an API key

    Sign up and grab a key from the dashboard — $0.50 free credit, no card required.

    Get API key →
  2. 2

    Make your first request

    Drop in your key and send a chat completion — fully OpenAI-compatible.

    curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "eleven-flash-v2-5",
    "messages": [
      {"role": "user", "content": "Explain prompt caching in one paragraph."}
    ]
  }'
  3. 3

    Stream responses

    Add "stream": true to receive tokens as they arrive.

    curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "eleven-flash-v2-5",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

FAQ

Common questions about this model.

How much does ElevenLabs Flash v2.5 cost?

$0.2025 per 1K char. Per 1,000 characters of input text. Billed on successful synthesis.

How do I use ElevenLabs Flash v2.5?

Kyma is OpenAI-compatible: point your SDK's base URL at https://kymaapi.com/v1, use your Kyma API key, and set the model to eleven-flash-v2-5. Signing up is free and includes $0.50 of credit — no card required.

How does Kyma handle pricing for this model?

Billing is calculated per character, and repeated prompt prefixes are charged at 10% of the standard input rate through automatic caching.

Can I use this model for structured data output or reasoning tasks?

No, it is strictly a text-to-speech model that outputs audio and does not support reasoning, vision, or JSON formatting.

What happens if the serving path experiences high latency?

Kyma automatically reroutes the request to a healthy serving path to maintain delivery, and the exact cost is always returned in the usage object.

Start with $0.50 free credit — no card required.Create account →

More models by ElevenLabs

ModelContextInputOutput
ElevenLabsElevenLabs Music—$0.135 / sec
ElevenLabsElevenLabs v3—$0.405 / 1K char
ElevenLabsElevenLabs Turbo v2.5—$0.2025 / 1K char
ElevenLabsElevenLabs Sound Effects—$0.027 / call
ElevenLabsElevenLabs Multilingual v2—$0.405 / 1K char