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Claude Opus 5 vs Sakana Namazu

Claude Opus 5 leads the LLM Stats Score 56.2 to 43.2. Sakana Namazu is 5.8x cheaper per token.

Anthropic · Sakana AI · Updated for 2026

Which is better?

Claude Opus 5 leads the overall LLM Stats Score 56.2 to 43.2, ranking #2 overall.

On price, Sakana Namazu is roughly 5.8x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Opus 5 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Opus 5

  • overall performance matters — it scores 56.2 and ranks #2 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you process long inputs — it offers a 1,000,000 token context window

Choose Sakana Namazu

  • cost matters — it's about 5.8x cheaper per token
  • you want the most recent training data — it shipped Aug 2026

At a glance

The differences that matter most.

Claude Opus 5
Anthropic
Sakana Namazu
Sakana AI
Core performance indexes
LLM Stats Score
56.2
#2
43.2
#37
Reasoning
55.0
#3
43.0
#36
Cost, coverage & limits
Benchmark wins
—
—
Input price
$5.00 / M
$0.95 / M
Output price
$25.00 / M
$4.00 / M
Context window
1,000,000
256,000

Individual benchmarks

12 reported for Claude Opus 5 · 3 for Sakana Namazu

No common benchmarks found

Claude Opus 5 and Sakana Namazudon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Sakana Namazu costs less

For input processing, Claude Opus 5 ($5.00/1M tokens) is 5.3x more expensive than Sakana Namazu ($0.95/1M tokens).

For output processing, Claude Opus 5 ($25.00/1M tokens) is 6.3x more expensive than Sakana Namazu ($4.00/1M tokens).

In conclusion, Claude Opus 5 is more expensive than Sakana Namazu.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Fri Aug 28 2026 • llm-stats.com
Anthropic
Claude Opus 5
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
Sakana AI
Sakana Namazu
Input tokens$0.95
Output tokens$4.00
Best providerUnknown Organization
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Opus 5 accepts 1,000,000 input tokens compared to Sakana Namazu's 256,000 tokens. Sakana Namazu can generate longer responses up to 256,000 tokens, while Claude Opus 5 is limited to 128,000 tokens.

Anthropic
Claude Opus 5
Input1,000,000 tokens
Output128,000 tokens
Sakana AI
Sakana Namazu
Input256,000 tokens
Output256,000 tokens
Fri Aug 28 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Opus 5 and Sakana Namazu support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Opus 5

Text
Images
Audio
Video

Sakana Namazu

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Opus 5

Proprietary

Closed source

Sakana Namazu

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 5 was released on 2026-07-24, while Sakana Namazu was released on 2026-08-03.

Sakana Namazu is 0 month newer than Claude Opus 5.

Claude Opus 5

Jul 24, 2026

1 months ago

Sakana Namazu

Aug 3, 2026

3 weeks ago

1w newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude Opus 5 is available from Anthropic. Sakana Namazu is available from Sakana AI.

Claude Opus 5

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M

Sakana Namazu

sakana logo
Unknown Organization
Input Price:Input: $0.95/1MOutput Price:Output: $4.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Opus 5 and Sakana Namazu side-by-side, then vote on the output you prefer.

Claude Opus 5
✓ Preferred
Sakana Namazu
Open in Playground

FAQ

Common questions about Claude Opus 5 vs Sakana Namazu.

Which is better, Claude Opus 5 or Sakana Namazu?

Claude Opus 5 leads the LLM Stats Score 56.2 to 43.2. Claude Opus 5 is made by Anthropic and Sakana Namazu is made by Sakana AI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Opus 5 compare to Sakana Namazu in benchmarks?

Claude Opus 5 scores BrowseComp: 90.8%, BioMysteryBench: 90.1%, OSWorld 2.0: 70.6%, DeepSWE 1.1: 68.8%, Humanity's Last Exam: 64.7%. Sakana Namazu scores AIME 2026: 96.7%, LiveCodeBench v6: 90.3%, MMLU-Pro: 90.3%.

Is Claude Opus 5 cheaper than Sakana Namazu?

Sakana Namazu is 5.3x cheaper for input tokens. Claude Opus 5 costs $5.00/M input and $25.00/M output via anthropic. Sakana Namazu costs $0.95/M input and $4.00/M output via sakana.

What are the context window sizes for Claude Opus 5 and Sakana Namazu?

Claude Opus 5 supports 1.0M tokens and Sakana Namazu supports 256K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Opus 5 and Sakana Namazu?

Key differences include LLM Stats Score (56.2 vs 43.2), context window (1.0M vs 256K), input pricing ($5.00 vs $0.95/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 5 and Sakana Namazu?

Claude Opus 5 is developed by Anthropic and Sakana Namazu is developed by Sakana AI.

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