Compare

FLUX 3 Image Klein vs O3

Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 2 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.

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FLUX 3 Image Klein
black-forest-labs/flux-3-image-klein
O3
openai/o3
Provider
Black Forest Labs
OpenAI
Family
FLUX
o-series
Modality
image
text
Context window
—
200,000 tok
Max output
—
100,000 tok
Released
2026-10-16
2026-05-22
License
Open-weight
Open-weight
Input price
—
$2.00 /1M
Output price
—
$8.00 /1M
Per image
$0.0090 /img
—
Tools
—
—
Streaming
—
yes
Vision
—
—
JSON mode
—
—
Reasoning
—
—
Prompt caching
—
—
Batch API
—
—
Try it
View model →
Open in playground →
FLUX 3 Image Klein
black-forest-labs/flux-3-image-klein
Full spec →

FLUX 3 Image Klein is Black Forest Labs' 5.6B-parameter image model for text-to-image, image editing, and multi-reference generation with up to 10 reference images. It supports native 4K output and bounding-box layout control.

Strengths
  • Text-to-image generation
  • Creative control
Use cases
Marketing assetsProduct mockupsConcept art
O3
openai/o3
Full spec →

o3 is OpenAI’s general-purpose reasoning model, balancing strong analytical performance with reasonable latency and cost.

Strengths
  • General-purpose chat
  • Long context
  • Tool use
Use cases
ChatbotsContent generationAgentic workflows

Compare with another

Gemini 4 Argon vs FLUX 3 Image Klein
google/gemini-4-argon · black-forest-labs/flux-3-image-klein
Gemini 4 Argon vs O3
google/gemini-4-argon · openai/o3
Claude Opus 5.5 vs FLUX 3 Image Klein
anthropic/claude-opus-5.5 · black-forest-labs/flux-3-image-klein
Claude Opus 5.5 vs O3
anthropic/claude-opus-5.5 · openai/o3
Claude Sonnet 5.5 vs FLUX 3 Image Klein
anthropic/claude-sonnet-5.5 · black-forest-labs/flux-3-image-klein
Claude Sonnet 5.5 vs O3
anthropic/claude-sonnet-5.5 · openai/o3
Deepseek-V4.1-Flash-1017 vs FLUX 3 Image Klein
deepseek/deepseek-v4.1-flash-1017 · black-forest-labs/flux-3-image-klein
Deepseek-V4.1-Flash-1017 vs O3
deepseek/deepseek-v4.1-flash-1017 · openai/o3
Grok 4.7 vs FLUX 3 Image Klein
xai/grok-4.7 · black-forest-labs/flux-3-image-klein
SWITCH BETWEEN THEM

One key, all 2, one line different.

from openai import OpenAI

client = OpenAI(
    base_url="https://api.aigateway.sh/v1",
    api_key="sk-aig-...",
)

# FLUX 3 Image Klein
client.chat.completions.create(
    model="black-forest-labs/flux-3-image-klein",
    messages=[{"role":"user","content":"hello"}],
)

# O3
client.chat.completions.create(
    model="openai/o3",
    messages=[{"role":"user","content":"hello"}],
)
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