lucidity · Efficient
Synth 2.5 Flash Preview
Synth 2.5 Flash Preview is a low-cost text model designed for role-play, character dialogue, and collaborative storytelling.
- Input
- Text
- Output
- Text
- Discovery tier
- Efficient
Pricing
USD per 1M tokens- Input
- $0.03
- Output
- $0.10
Reference prices as published by the model provider. API example
Specifications
- Context window
- 30K
- Max output
- —
Side by side
Synth 2.5 Flash Preview compared
Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.
| Synth 2.5 Flash PreviewlucidityThis model | Qwen3.7 FlashQwenRemove | |
|---|---|---|
| Provider | lucidity | Qwen |
| Discovery tier | Efficient | Efficient |
| Added | Sep 5, 2026 | Jul 25, 2026 |
| Limits | ||
| Context window | 30K | 991.81KBest |
| Max output | — | 65.54K |
| Pricing, USD per 1M tokens | ||
| Input | $0.03 | $0.03 |
| Output | $0.10Best | $0.13 |
| Cache read | — | $0.006 |
| Cache write | — | $0.038 |
| Performance | ||
| Request success (24h) | — | 99.9% |
| Capabilities | ||
| Reasoning | No | Yes |
| Tools | No | Yes |
| Vision | No | Yes |
| Structured output | No | Yes |
| Video input | No | Yes |
| Reasoning effort | — | none, high |
Public evaluations
Benchmarks
There are no public benchmark results for these models yet.
Developers
Use it through the API
Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.
curl https://www.noumen.xyz/api/v1/chat/completions \
-H "Authorization: Bearer $NOUMEN_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "synth-2.5-flash",
"messages": [{ "role": "user", "content": "Explain this stack trace." }]
}'import os
from openai import OpenAI
client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
model="synth-2.5-flash",
messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)lucidity
Related models
Other lucidity models, starting with the same family.
- EfficientCompare