Claude Opus 4.5 vs FLUX 1.1 Pro Ultra

Compare Claude Opus 4.5 and FLUX 1.1 Pro Ultra: pricing, performance, context window, latency, and best use cases. Side-by-side comparison on XALEN.

Updated 2026-05-21 · By Abhishek Raj · Our methodology

All Anthropic models All Black Forest Labs models What is an LLM API? Python Quickstart What is inference?
Feature Claude Opus 4.5 FLUX 1.1 Pro Ultra
CategoryFrontierImage
Parameters~2.5T~30B
Context Window200KN/A
Input Price$0.15/1M tokens$0.06/image/1M tokens
Output Price$0.75/1M tokensN/A/1M tokens
Latency~900ms~6s

Choose Claude Opus 4.5 when:

  • ✓ Creative writing
  • ✓ Complex analysis
  • ✓ Research
Key Strengths:

Superior creativity, Nuanced reasoning, Complex analysis

Choose FLUX 1.1 Pro Ultra when:

  • ✓ Print-quality imagery
  • ✓ Ultra-HD content
  • ✓ Professional art
Key Strengths:

Ultra quality, 4K output, Best detail

Verdict: Claude Opus 4.5 vs FLUX 1.1 Pro Ultra

For cost efficiency, FLUX 1.1 Pro Ultra wins at $0.06/image/1M input tokens. For speed, FLUX 1.1 Pro Ultra is faster at ~6s. Claude Opus 4.5 excels at Creative writing while FLUX 1.1 Pro Ultra is better for Print-quality imagery. Both are available on XALEN through a single API — try them in the Playground to see which fits your workload.

Detailed Analysis

Pricing Comparison

Claude Opus 4.5 costs $0.15/1M input tokens and $0.75/1M output tokens. FLUX 1.1 Pro Ultra costs $0.06/image input and N/A output. FLUX 1.1 Pro Ultra is 2.5x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.

Performance & Context

Claude Opus 4.5 has a 200K context window with ~900ms latency. FLUX 1.1 Pro Ultra offers N/A context at ~6s. Claude Opus 4.5 has the larger context window.

Best For

Claude Opus 4.5 (Frontier) is optimized for: Creative writing, Complex analysis, Research. FLUX 1.1 Pro Ultra (Image) works best for: Print-quality imagery, Ultra-HD content, Professional art.

Try Both on XALEN

Both models are available through XALEN's OpenAI-compatible API. Switch between them by changing the model parameter:

from xalen import XALEN

client = XALEN(api_key="xln_test_YOUR_KEY")

# Use Claude Opus 4.5
response_a = client.chat.completions.create(
    model="claude-opus-4-5",
    messages=[{"role": "user", "content": "Your question here"}]
)

# Use FLUX 1.1 Pro Ultra
response_b = client.chat.completions.create(
    model="flux-1-1-pro-ultra",
    messages=[{"role": "user", "content": "Your question here"}]
)

Start Building with XALEN

200+ AI models. One API. Pay-as-you-go.

Get API Key Try in Playground

Frequently Asked Questions

Which is better, Claude Opus 4.5 or FLUX 1.1 Pro Ultra?

Claude Opus 4.5 (Frontier, ~2.5T) offers Superior creativity. FLUX 1.1 Pro Ultra (Image, ~30B) offers Ultra quality. Choose Claude Opus 4.5 for Creative writing or FLUX 1.1 Pro Ultra for Print-quality imagery.

How much does Claude Opus 4.5 cost vs FLUX 1.1 Pro Ultra?

Claude Opus 4.5: $0.15/1M input, $0.75/1M output. FLUX 1.1 Pro Ultra: $0.06/image/1M input, N/A/1M output. Both available on XALEN with batch processing at 50% discount.

Can I use both models on XALEN?

Yes. XALEN provides 200+ models through a single OpenAI-compatible API. Switch between Claude Opus 4.5 and FLUX 1.1 Pro Ultra by changing the model parameter. No code changes needed.

Related Comparisons

Claude Opus 4.5 vs GPT-4.1 Claude Opus 4.5 vs GPT-4.1 Mini Claude Opus 4.5 vs GPT-4o Claude Opus 4.5 vs DALL-E 3 Claude Opus 4.5 vs Claude Opus 4 Claude Opus 4.5 vs Claude Sonnet 4

Last updated: 2026-05-21. Pricing and specifications may change. Check pricing page for latest rates.