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Flux 1.1 ProvsClaude Opus 4

Black Forest Labs vs Anthropic — Side-by-side model comparison

Claude Opus 4 leads 3/5 categories

Head-to-Head Comparison

MetricFlux 1.1 ProClaude Opus 4
Provider
Black Forest Labs
Arena Rank
#1
Context Window
200K
Input Pricing
$0.04/img/1M tokens
$5.00/1M tokens
Output Pricing
$25.00/1M tokens
Parameters
12B
Undisclosed
Open Source
No
No
Best For
Image generation, design
Complex reasoning, coding, agentic tasks
Release Date
Oct 2, 2024
May 22, 2025

Flux 1.1 Pro

Flux 1.1 Pro is the flagship image generation model from Black Forest Labs, founded by the original team behind Stable Diffusion. It produces high-quality images with excellent prompt adherence and fast generation times. The model competes directly with Midjourney and DALL-E 3 on image quality while offering more flexible API-based access. Black Forest Labs' deep expertise in diffusion models, gained through years of pioneering work on Stable Diffusion, gives Flux a strong technical foundation and rapid iteration cycle.

Claude Opus 4

Claude Opus 4 is Anthropic's most powerful AI model, holding the #1 position on the Chatbot Arena leaderboard. It represents a breakthrough in extended thinking and agentic capabilities, able to work autonomously on complex multi-step tasks for hours. With a 200K token context window, it excels at analyzing entire codebases, lengthy legal documents, and research papers in a single pass. The model demonstrates exceptional performance in coding (setting new benchmarks on SWE-bench), advanced reasoning, and nuanced writing tasks. Its agentic capabilities allow it to use tools, navigate computers, and execute multi-step workflows with minimal human oversight. Opus 4 is the preferred choice for enterprises requiring the highest quality output on mission-critical tasks where accuracy and depth matter more than speed or cost.

View Anthropic profile →
F

When to use Flux 1.1 Pro

  • +Budget is a concern and you need cost efficiency
  • +Your use case involves image generation, design
View full Flux 1.1 Pro specs →
C

When to use Claude Opus 4

  • +Quality matters more than cost
  • +Your use case involves complex reasoning, coding, agentic tasks
View full Claude Opus 4 specs →

The Verdict

Claude Opus 4 wins our head-to-head comparison with 3 out of 5 category wins. It's the stronger choice for complex reasoning, coding, agentic tasks, though Flux 1.1 Pro holds an edge in image generation, design. If cost is your primary concern, Flux 1.1 Pro offers better value.

Last compared: March 2026 · Data sourced from public benchmarks and official pricing pages

Frequently Asked Questions

Which is better, Flux 1.1 Pro or Claude Opus 4?
In our head-to-head comparison, Claude Opus 4 leads in 3 out of 5 categories (arena rank, context window, input pricing, output pricing, and parameters). Claude Opus 4 excels at complex reasoning, coding, agentic tasks, while Flux 1.1 Pro is better suited for image generation, design. The best choice depends on your specific requirements, budget, and use case.
How does Flux 1.1 Pro pricing compare to Claude Opus 4?
Flux 1.1 Pro charges $0.04/img per 1M input tokens and an undisclosed amount per 1M output tokens. Claude Opus 4 charges $5.00 per 1M input tokens and $25.00 per 1M output tokens. Flux 1.1 Pro is the more affordable option. For high-volume production workloads, the pricing difference can significantly impact total cost of ownership.
What is the context window difference between Flux 1.1 Pro and Claude Opus 4?
Flux 1.1 Pro supports a undisclosed token context window, while Claude Opus 4 supports 200K tokens. Context window size matters most for tasks involving long documents, large codebases, or extended conversations.
Can I use Flux 1.1 Pro or Claude Opus 4 for free?
Flux 1.1 Pro is a paid API model starting at $0.04/img per 1M input tokens. Claude Opus 4 is a paid API model starting at $5.00 per 1M input tokens.
Which model has better benchmarks, Flux 1.1 Pro or Claude Opus 4?
Flux 1.1 Pro's arena rank is not yet available, while Claude Opus 4 holds rank #1. Note that benchmarks don't capture every use case — we recommend testing both models on your specific tasks.
Is Flux 1.1 Pro or Claude Opus 4 better for coding?
Flux 1.1 Pro's primary strength is image generation, design. Claude Opus 4 is specifically optimized for coding tasks. For coding specifically, arena rank and code-specific benchmarks are the best indicators of performance.