Pricing, context window, capabilities, and release date — pulled from each provider's public docs. Both are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.
Both models stream in parallel through your own AIgateway key. Tokens, latency, and cost update as they arrive.
| FLUX.2 [Flex] black-forest-labs/flux-2-flex | Flux-2-Klein-4b black-forest-labs/flux-2-klein-4b | |
|---|---|---|
| Provider | Black Forest Labs | Black Forest Labs |
| Family | FLUX | FLUX |
| Modality | image | image |
| Context window | — | — |
| Max output | — | — |
| Released | 2026-05-27 | 2026-01-14 |
| Input price | $0.0000 /img | $0.0012 /img |
| Output price | — | — |
| Cache read | — | — |
| Tools | — | — |
| Streaming | — | — |
| Vision | — | — |
| JSON mode | — | — |
| Reasoning | — | — |
| Prompt caching | — | — |
FLUX.2 [flex] is Black Forest Labs' fine-grained control variant of FLUX.2 — exposes tunable inference steps, guidance, and prompt upsampling for typography-heavy and production workflows.
FLUX.2 [klein] is an ultra-fast, distilled image model. It unifies image generation and editing in a single model, delivering state-of-the-art quality enabling interactive workflows, real-time previews, and latency-critical applications.
# pip install aigateway-py openai
# aigateway-py: sub-accounts, evals, replays, jobs, webhook verify.
# openai SDK: chat/embeddings/images/audio — drop-in compat per our SDK's own guidance.
from openai import OpenAI
client = OpenAI(
base_url="https://api.aigateway.sh/v1",
api_key="sk-aig-...",
)
# Try FLUX.2 [Flex]
client.chat.completions.create(
model="black-forest-labs/flux-2-flex",
messages=[{"role":"user","content":"hello"}],
)
# Try Flux-2-Klein-4b — same client, same key
client.chat.completions.create(
model="black-forest-labs/flux-2-klein-4b",
messages=[{"role":"user","content":"hello"}],
)