NVIDIA: FLUX.2 Klein 4B
FLUX.2 Klein 4B is an image generation model from NVIDIA released on Jan 14, 2026. It reads text and images and writes images, with a 41K token context window.
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It costs $0 per million input tokens and $0 per million output tokens.
Its weights are open, so you can host it yourself.
- Modalities
- In / out price
- $0 / $0 per 1M
- Context
- 41K
- Max output
- 41K
- Released
- Jan 14, 2026
- Knowledge cutoff
- Jun 2025
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
FLUX.2 Klein 4B 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 / 1M tokens | |
|---|---|---|
| Output | $0 / 1M tokens |
What FLUX.2 Klein 4B costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call FLUX.2 Klein 4B through an OpenAI compatible API.
- Temperature
temperature
Alternatives to FLUX.2 Klein 4B
Models that take the same inputs, closest in price, cheaper ones first.
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- 41K context
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NVIDIA: Qwen Image
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FLUX.2 Klein 4B questions
How much does the FLUX.2 Klein 4B API cost?
$0 per million input tokens and $0 per million output tokens. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of FLUX.2 Klein 4B?
40,960 tokens of input, and it can write up to 40,960 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Is FLUX.2 Klein 4B 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 FLUX.2 Klein 4B released?
Jan 14, 2026, with training data up to Jun 2025.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.
Building on FLUX.2 Klein 4B?
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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