Z.ai · Open weights
Apex Flash 1
Apex Flash 1 is Cantina Security and Yeta's cybersecurity-focused post-train of GLM 5.3 Flash for code investigation and tool use.
- Reasoning
- Tools
- Vision
- Input
- Text, Images
- Output
- Text
- Reasoning effort
- low · high · max
- Discovery tier
- Open weights
Pricing
USD per 1M tokens- Input
- $0.15
- Output
- $0.50
- Cache read
- $0.075
Reference prices as published by the model provider. API example
Specifications
- Context window
- 1M
- Max output
- 32.8K
- Average output (7 days)
- 672 tokens
- Longer than 59% of 465 models
Side by side
Apex Flash 1 compared
Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.
| Apex Flash 1Z.aiThis model | GLM 5.3 UncensoredZ.aiRemove | |
|---|---|---|
| Provider | Z.ai | Z.ai |
| Discovery tier | Open weights | Open weights |
| Added | Oct 5, 2026 | Sep 26, 2026 |
| Limits | ||
| Context window | 1.05M | 1.05M |
| Max output | 32.77K | 131.07KBest |
| Average output | 672 tokens | 1.1K tokens |
| Pricing, USD per 1M tokens | ||
| Input | $0.15Best | $1.25 |
| Output | $0.50Best | $2.25 |
| Cache read | $0.075Best | $0.30 |
| Performance | ||
| Throughput | 14.5 tok/s | 37.0 tok/sBest |
| Time to first token | 4.1 sBest | 7.6 s |
| Request success (24h) | 94.6% | 98.8%Best |
| Capabilities | ||
| Reasoning | Yes | Yes |
| Tools | Yes | Yes |
| Vision | Yes | No |
| Reasoning effort | low, high, max | low, high, max |
Public evaluations
Benchmarks
Independent evaluation results, with how each score ranks among the models in the Noumen catalog.
- Apex Flash 1
- GLM 5.3 Uncensored
| Leaderboard | Apex Flash 1 | GLM 5.3 Uncensored |
|---|---|---|
| Usage Share | Not in top 20 | #8 · 4.8% |
Ranks among Noumen catalog models on Usage leaderboards. Only top-20 placements are listed.
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.
- Throughput
- 14.5 tok/s
- Faster than 5% of 251 models
- Time to first token
- 4.1 s
- Quicker than 41% of 251 models
- Prompt cache hits
- 92.3%
- About $0.0807 per 1M input tokens with caching
- Request success (24h)
- 94.6%
- Unstable
Cache hits are the share of input tokens recently served from a prompt cache across all requests. They are not a forecast of your own hit rate.
- 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": "z-ai/glm-5.3-flash-apex",
"reasoning_effort": "low",
"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="z-ai/glm-5.3-flash-apex",
messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)Z.ai
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