FLUX.2 [klein] 4B
bfl/flux-2-klein-4bمن bfl · العائلة: flux · أُصدِر 2026-06-08
Prices in USD per 1M tokens. Unknown means the provider does not publish per-token pricing.
القدرات
Model fit scores
0–100 · higher is betterThese scores reward declared capabilities, context size, price and provider availability — they are not benchmark results. Use them as a directional signal alongside your own evaluation.
Coding1
- Tool calling0/40
- Structured output0/20
- Reasoning0/10
- Context window (100K → 1M)0/20
- Provider availability1/10
Agents1
- Tool calling0/35
- Structured output0/25
- Reasoning0/15
- Output token limit0/15
- Provider availability1/10
JSON / structured output10
- Structured output / JSON mode0/50
- Tool calling0/20
- Temperature control10/10
- Price-friendly for high-volume0/20
Cost efficiency0
- Has published price0/100
Long context0
- Context ≥ 100K0/100
Production-readiness30
- Number of independent providers5/40
- Has published per-token price0/20
- Context window ≥ 8K0/15
- No data inconsistencies across providers10/10
- Official model (not derivative)15/15
Cost Efficiency Index
Open full calculator →Estimated cost using the recommended provider's headline rate. Each scenario fixes average input/output tokens — the assumptions are shown in the third column.
This model has no published per-token price, so we can't compute a cost estimate. See the provider's official pricing page for current rates.
متاح لدى 1 مزود
| المزود | معرف نموذج المزود | إدخال / 1M | إخراج / 1M | السياق | تاريخ الإصدار |
|---|---|---|---|---|---|
| Vercel AI Gateway vercel | bfl/flux-2-klein-4b | Unknown | Unknown | Unknown | 2026-06-08 |
Frequently asked questions
How much does FLUX.2 [klein] 4B cost?
FLUX.2 [klein] 4B does not have a publicly published per-token price in our data source. This usually means it is gated behind enterprise sales or invite access. Check bfl's official pricing page for the most current rates.
Does FLUX.2 [klein] 4B support tool calling?
No. FLUX.2 [klein] 4B does not support tool calling (function calling). If your workflow requires it, look at the /capabilities/tool-calling list for alternatives.
Does FLUX.2 [klein] 4B support structured output / JSON mode?
Support for structured output / JSON-schema-constrained decoding is not reported for FLUX.2 [klein] 4B in our data source. Verify with bfl's official documentation before relying on it in production.
Can FLUX.2 [klein] 4B accept image input?
No. FLUX.2 [klein] 4B only accepts text as input. If you need image input, see our /capabilities/vision list for current vision-capable models.
Is FLUX.2 [klein] 4B open-weight?
No. FLUX.2 [klein] 4B is a proprietary model — only bfl (and any approved hosting partners) can serve it. The pricing above reflects the cheapest API access.
What are the best alternatives to FLUX.2 [klein] 4B?
If FLUX.2 [klein] 4B doesn't fit, consider FLUX.2 [klein] 9B, FLUX.2 [flex], FLUX.1 Kontext Max. Each one targets the same use case — see the Related links below for direct head-to-head pages.
Where does this data come from?
All numbers are normalised into a single canonical model record and reconciled with each provider's official documentation. We re-pull daily and write any changes (price, context, capability) to the /changelog page.
Explore more
More bfl models
- FLUX.2 [klein] 9BUnknown pricing
- FLUX.2 [flex]Unknown pricing
- FLUX.1 Kontext MaxUnknown pricing
- FLUX.2 [pro]Unknown pricing
- FLUX1.1 [pro] UltraUnknown pricing
آخر تحديث:
Pricing and capabilities are refreshed daily and reconciled against each provider's official documentation. Always verify critical production decisions with the provider directly.