lucidity · Efficient
Synth 2.5 Pro Preview
Synth 2.5 Pro 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
- $0.10
- Output
- $0.20
Reference prices as published by the model provider. API example
Specifications
- Context window
- 30K
- Max output
- —
Side by side
Synth 2.5 Pro Preview compared
Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.
| Synth 2.5 Pro PreviewlucidityThis model | Mercury 3InceptionRemove | |
|---|---|---|
| Provider | lucidity | Inception |
| Discovery tier | Efficient | Efficient |
| Added | Sep 5, 2026 | Oct 19, 2026 |
| Limits | ||
| Context window | 30K | 1MBest |
| Max output | — | 131.07K |
| Average output | — | 1.9K tokens |
| Pricing, USD per 1M tokens | ||
| Input | $0.10 | $0.10 |
| Output | $0.20Best | $0.35 |
| Cache read | — | $0.01 |
| Performance | ||
| Throughput | — | 735.8 tok/s |
| Time to first token | — | 3.7 s |
| Request success (24h) | 0.0% | 100.0%Best |
| Capabilities | ||
| Reasoning | No | Yes |
| Tools | No | Yes |
| Structured output | No | Yes |
| Parallel tools | No | Yes |
| Reasoning effort | — | none, low, medium, high |
Public evaluations
Benchmarks
There are no public benchmark results for these models yet.
Live routing data
Performance and reliability
Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.
- Request success (24h)
- 0.0%
- Failing
Hourly request success · last 72 hoursLowest hour 0.0%
- Healthy (98% or more)
- Degraded (90–98%)
- Down (under 90%)
- No requests
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-pro",
"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-pro",
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