---
title: "Synth 2.5 Flash Preview API pricing"
canonical: https://uplinkswitch.ai/models/synth-2.5-flash
generated: 2026-10-22T19:01:26.920Z
source: https://api.uplinkswitch.com/v1/catalog
base_url: https://api.uplinkswitch.com/v1
---

# Synth 2.5 Flash Preview API pricing

Synth 2.5 Flash Preview API at $0.105/M input and $0.35/M output tokens. 30,000-token context window. Works with the OpenAI SDK.

## Price per million tokens (USD)

| Tokens | Lucidity list price | UplinkSwitch | Under list |
| --- | --- | --- | --- |
| Input | — | $0.105 | — |
| Cached input | — | billed at the input rate | — |
| Output | — | $0.35 | — |

## Model

- Model id: `synth-2.5-flash`
- Formats: OpenAI SDK
- Base URL: https://api.uplinkswitch.com/v1
- Context window: 30,000 tokens
- Input: text
- Daily real-model check: No answer at the last check (https://uplinkswitch.ai/proof#synth-2.5-flash)

## Request

### Python · OpenAI SDK

```python
from openai import OpenAI

client = OpenAI(
    base_url="https://api.uplinkswitch.com/v1",
    api_key="sk-uplink-live-...",
)

completion = client.chat.completions.create(
    model="synth-2.5-flash",
    messages=[{"role": "user", "content": "Summarize this in one line."}],
)
print(completion.choices[0].message.content)
```

### TypeScript · OpenAI SDK

```typescript
import OpenAI from 'openai';

const client = new OpenAI({
  baseURL: 'https://api.uplinkswitch.com/v1',
  apiKey: 'sk-uplink-live-...',
});

const completion = await client.chat.completions.create({
  model: 'synth-2.5-flash',
  messages: [{ role: 'user', content: 'Summarize this in one line.' }],
});
console.log(completion.choices[0].message.content);
```

### curl

```bash
curl https://api.uplinkswitch.com/v1/chat/completions \
  -H "authorization: Bearer sk-uplink-live-..." \
  -H "content-type: application/json" \
  -d '{"model":"synth-2.5-flash","messages":[{"role":"user","content":"Hello"}]}'
```

## Questions

### What is Synth 2.5 Flash Preview?

Synth 2.5 Flash Preview is a model from Lucidity, with a 30,000-token context window, taking text input. Through UplinkSwitch it answers the OpenAI SDK on one key as synth-2.5-flash.

### How much does the Synth 2.5 Flash Preview API cost?

$0.105 per million input tokens and $0.35 per million output tokens.

### Is Synth 2.5 Flash Preview free?

It is pay as you go: prepaid credit from $10, with no subscription or monthly fee, billed per token. A 1,000-token prompt with a 500-token reply costs about $0.0003.

### What is the Synth 2.5 Flash Preview context window?

Synth 2.5 Flash Preview has a 30,000-token context window. It takes text input.

### What is the Synth 2.5 Flash Preview model id?

synth-2.5-flash. Send it as the model through the OpenAI SDK with base URL https://api.uplinkswitch.com/v1.

### How do I get a Synth 2.5 Flash Preview API key?

Create one in the console at uplinkswitch.ai/console: prepaid credit from $10, no subscription, and the key is live at once. The same key calls Synth 2.5 Flash Preview and every other model in the catalog; send it as the bearer token with base URL https://api.uplinkswitch.com/v1.

### Is there a Synth 2.5 Flash Preview API?

Yes: synth-2.5-flash on the OpenAI format at https://api.uplinkswitch.com/v1, $0.105 input and $0.35 output per million tokens. No weights to download and no GPU of your own; the key also runs every other model in the catalog.

### Is Synth 2.5 Flash Preview open source?

No. No weights or model card are published for it; it is available only as a hosted model, here per token on the OpenAI format.

### What is Synth 2.5 Flash Preview based on?

Lucidity has not published a base model, parameter count or training notes for it. The catalog lists a 30,000-token context window.

### What does Synth 2.5 Flash Preview cost per 100 messages?

$0.0385 for 100 chat turns of 2,000 input and 500 output tokens each, at $0.105 input and $0.35 output per million tokens, from prepaid credit with no subscription.

### Synth 2.5 Flash Preview or Synth 2.5 Pro Preview?

Both are Lucidity’s Synth 2.5 previews with a 30,000-token context; Pro is the higher tier at a higher price. Synth 2.5 Flash Preview is $0.105 / $0.35 per million tokens in / out, $0.38 for 1,000 chat turns; Synth 2.5 Pro Preview is $0.35 / $0.70 per million tokens in / out, $1.05 for 1,000 chat turns. Both run on the same key, so send the same prompt to each.

## Related

- Uncensored LLM API: https://uplinkswitch.ai/uncensored
- SillyTavern setup: https://uplinkswitch.ai/guides/sillytavern
- Janitor AI setup: https://uplinkswitch.ai/guides/janitor-ai
- Chub AI setup: https://uplinkswitch.ai/guides/chub-ai
- SDKs setup: https://uplinkswitch.ai/guides/sdks
- Every model and price: https://uplinkswitch.ai/llms-full.txt
- Machine catalog: https://uplinkswitch.ai/ai-catalog.json