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Reka CorevsClaude Opus 4

Reka AI vs Anthropic — Side-by-side model comparison

Reka Core leads 3/5 categories

Head-to-Head Comparison

MetricReka CoreClaude Opus 4
Provider
Arena Rank
#17
#1
Context Window
128K
200K
Input Pricing
$2.00/1M tokens
$5.00/1M tokens
Output Pricing
$2.00/1M tokens
$25.00/1M tokens
Parameters
67B
Undisclosed
Open Source
No
No
Best For
Multimodal reasoning, video understanding, multilingual
Complex reasoning, coding, agentic tasks
Release Date
Apr 15, 2024
May 22, 2025

Reka Core

Reka Core, developed by Reka AI, is a multimodal model that natively processes text, images, video, and audio inputs in a unified architecture. Founded by former Google DeepMind researchers who helped build Google's Gemini, Reka AI brings deep expertise in multimodal training to this flagship model. Reka Core demonstrates competitive performance against larger models on general reasoning and multimodal understanding benchmarks. Its ability to process video and audio natively, rather than through separate encoder pipelines, enables more coherent cross-modal understanding. The model targets enterprise applications requiring versatile multimodal AI, including document analysis with embedded media, video understanding, and audio-visual content processing. Reka AI has positioned Reka Core as a practical alternative for organizations seeking multimodal capabilities without dependence on the largest AI providers.

View Reka AI profile →

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 →

Key Differences: Reka Core vs Claude Opus 4

1

Claude Opus 4 ranks higher in arena benchmarks (#1) indicating stronger overall performance.

2

Reka Core is 7.5x cheaper on average, making it the better choice for high-volume applications.

3

Claude Opus 4 supports a larger context window (200K), allowing it to process longer documents in a single request.

R

When to use Reka Core

  • +Budget is a concern and you need cost efficiency
  • +Your use case involves multimodal reasoning, video understanding, multilingual
View full Reka Core specs →
C

When to use Claude Opus 4

  • +You need the highest quality output based on arena rankings
  • +Quality matters more than cost
  • +You need to process long documents (200K context)
  • +Your use case involves complex reasoning, coding, agentic tasks
View full Claude Opus 4 specs →

Cost Analysis

At current pricing, Reka Core is 7.5x more affordable than Claude Opus 4. For a typical enterprise workload processing 100M tokens per month:

Reka Core monthly cost

$200

100M tokens/mo (50/50 in/out)

Claude Opus 4 monthly cost

$1,500

100M tokens/mo (50/50 in/out)

The Verdict

Reka Core wins our head-to-head comparison with 3 out of 5 category wins. It's the stronger choice for multimodal reasoning, video understanding, multilingual, though Claude Opus 4 holds an edge in complex reasoning, coding, agentic tasks.

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

Frequently Asked Questions

Which is better, Reka Core or Claude Opus 4?
In our head-to-head comparison, Reka Core leads in 3 out of 5 categories (arena rank, context window, input pricing, output pricing, and parameters). Reka Core excels at multimodal reasoning, video understanding, multilingual, while Claude Opus 4 is better suited for complex reasoning, coding, agentic tasks. The best choice depends on your specific requirements, budget, and use case.
How does Reka Core pricing compare to Claude Opus 4?
Reka Core charges $2.00 per 1M input tokens and $2.00 per 1M output tokens. Claude Opus 4 charges $5.00 per 1M input tokens and $25.00 per 1M output tokens. Reka Core is the more affordable option, approximately 7.5x cheaper on average. For high-volume production workloads, the pricing difference can significantly impact total cost of ownership.
What is the context window difference between Reka Core and Claude Opus 4?
Reka Core supports a 128K token context window, while Claude Opus 4 supports 200K tokens. Claude Opus 4 can process longer documents, codebases, and conversations in a single request. Context window size matters most for tasks involving long documents, large codebases, or extended conversations.
Can I use Reka Core or Claude Opus 4 for free?
Reka Core is a paid API model starting at $2.00 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, Reka Core or Claude Opus 4?
Reka Core holds arena rank #17, while Claude Opus 4 holds rank #1. Claude Opus 4 performs better in overall arena benchmarks, which aggregate human preference ratings across coding, reasoning, and general tasks. Note that benchmarks don't capture every use case — we recommend testing both models on your specific tasks.
Is Reka Core or Claude Opus 4 better for coding?
Reka Core's primary strength is multimodal reasoning, video understanding, multilingual. Claude Opus 4 is specifically optimized for coding tasks. For coding specifically, arena rank and code-specific benchmarks are the best indicators of performance.