Z.ai: Apex Flash 1
Apex Flash 1 is a reasoning model from Z.ai released on Oct 5, 2026. It reads text and images and writes text, with a 1.05M token context window and up to 33K tokens per reply.
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It costs $0.15 per million input tokens and $0.50 per million output tokens. Cached input bills at $0.075, 50% less than fresh input.
It supports tool calling and prompt caching, and its weights are open, so you can host it yourself.
- Modalities
- In / out price
- $0.15 / $0.50 per 1M
- Context
- 1.05M
- Max output
- 33K
- Released
- Oct 5, 2026
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Apex Flash 1 pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $0.15 / 1M tokens | |
|---|---|---|
| Output | $0.50 / 1M tokens | |
| Cached input (read) | $0.075 / 1M tokens | 50% off input |
What Apex Flash 1 costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Apex Flash 1 through an OpenAI compatible API.
- Tools
tools - Reasoning
reasoning
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Apex Flash 1 questions
How much does the Apex Flash 1 API cost?
$0.15 per million input tokens and $0.50 per million output tokens, with cached input at $0.075. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Apex Flash 1?
1,048,576 tokens of input, and it can write up to 32,768 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Does Apex Flash 1 support tool calling?
Yes. It accepts tool definitions, which is what an agent needs to call your APIs.
Is Apex Flash 1 open source?
Its weights are published, so you can run it on your own hardware or a cloud of your choice. Read the license before commercial use.
When was Apex Flash 1 released?
Oct 5, 2026.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.
Building on Apex Flash 1?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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