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Claude Opus 5.5 vs Seed 2.0 Mini

Claude Opus 5.5 leads the LLM Stats Score 60.4 to 27.8. Seed 2.0 Mini is 45.7x cheaper per token.

Anthropic · ByteDance · Updated for 2026

Which is better?

Claude Opus 5.5 leads the overall LLM Stats Score 60.4 to 27.8, ranking #1 overall.

In the 2 individual benchmarks reported for both models, Claude Opus 5.5 wins 2; this is a narrower head-to-head signal than the composite indexes.

On price, Seed 2.0 Mini is roughly 45.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Opus 5.5 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 5.5

  • overall performance matters — it scores 60.4 and ranks #1 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 2 of 2 exact shared results
  • you process long inputs — it offers a 1,000,000 token context window
  • you want the most recent training data — it shipped Sep 2026

Choose Seed 2.0 Mini

  • cost matters — it's about 45.7x cheaper per token

At a glance

The differences that matter most.

Claude Opus 5.5
Anthropic
Seed 2.0 Mini
ByteDance
Core performance indexes
LLM Stats Score
60.4
#1
27.8
#159
Reasoning
59.5
#1
28.7
#148
Coding
49.9
#1
1.5
#254
Agents
45.5
#1
1.1
#195
Cost, coverage & limits
Benchmark wins
2 of 2
0 of 2
Input price
$4.00 / M
$0.10 / M
Output price
$20.00 / M
$0.40 / M
Context window
1,000,000
256,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Claude Opus 5.5
Seed 2.0 Mini
Math
41.8#6
26.4#111
Vision
41.6#1
17.9#97
Multimodal
41.2#1
21.2#80
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

31 reported for Claude Opus 5.5 · 83 for Seed 2.0 Mini

2 shared

Claude Opus 5.5 outperforms in 2 benchmarks (HealthBench, Humanity's Last Exam (no tools, text-only)), while Seed 2.0 Mini is better at 0 benchmarks.

Claude Opus 5.5 significantly outperforms across most benchmarks.

Sat Oct 24 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Seed 2.0 Mini costs less

For input processing, Claude Opus 5.5 ($4.00/1M tokens) is 40.0x more expensive than Seed 2.0 Mini ($0.10/1M tokens).

For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 50.0x more expensive than Seed 2.0 Mini ($0.40/1M tokens).

In conclusion, Claude Opus 5.5 is more expensive than Seed 2.0 Mini.*

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

Lowest available price from all providers
Sat Oct 24 2026 • llm-stats.com
Anthropic
Claude Opus 5.5
Input tokens$4.00
Output tokens$20.00
Best providerAnthropic
ByteDance
Seed 2.0 Mini
Input tokens$0.10
Output tokens$0.40
Best providerDeepinfra
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Claude Opus 5.5 accepts 1,000,000 input tokens compared to Seed 2.0 Mini's 256,000 tokens. Seed 2.0 Mini can generate longer responses up to 256,000 tokens, while Claude Opus 5.5 is limited to 128,000 tokens.

Anthropic
Claude Opus 5.5
Input1,000,000 tokens
Output128,000 tokens
ByteDance
Seed 2.0 Mini
Input256,000 tokens
Output256,000 tokens
Sat Oct 24 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Opus 5.5 and Seed 2.0 Mini support multimodal inputs.

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

Claude Opus 5.5

Text
Images
Audio
Video

Seed 2.0 Mini

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 5.5

Proprietary

Closed source

Seed 2.0 Mini

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 5.5 was released on 2026-09-22, while Seed 2.0 Mini was released on 2026-02-17.

Claude Opus 5.5 is 7 months newer than Seed 2.0 Mini.

Claude Opus 5.5

Sep 22, 2026

1 months ago

7mo newer
Seed 2.0 Mini

Feb 17, 2026

8 months ago

Knowledge Cutoff

When training data ends

Claude Opus 5.5 has a documented knowledge cutoff of 2026-06-01, while Seed 2.0 Mini's cutoff date is not specified.

We can confirm Claude Opus 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without Seed 2.0 Mini's cutoff date.

Claude Opus 5.5

Jun 2026

Seed 2.0 Mini

—

Provider Availability

Claude Opus 5.5 is available from Anthropic. Seed 2.0 Mini is available from DeepInfra.

Claude Opus 5.5

anthropic logo
Anthropic
Input Price:Input: $4.00/1MOutput Price:Output: $20.00/1M

Seed 2.0 Mini

deepinfra logo
Deepinfra
Input Price:Input: $0.10/1MOutput Price:Output: $0.40/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Opus 5.5 and Seed 2.0 Mini side-by-side, then vote on the output you prefer.

Claude Opus 5.5
✓ Preferred
Seed 2.0 Mini
Open in Playground

FAQ

Common questions about Claude Opus 5.5 vs Seed 2.0 Mini.

Which is better, Claude Opus 5.5 or Seed 2.0 Mini?

Claude Opus 5.5 leads the LLM Stats Score 60.4 to 27.8. Claude Opus 5.5 is made by Anthropic and Seed 2.0 Mini is made by ByteDance. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Opus 5.5 compare to Seed 2.0 Mini in benchmarks?

Claude Opus 5.5 scores BenchCAD (with Python tool): 96.2%, Global-MMLU: 94.3%, SWE-bench Multilingual: 93.9%, MILU: 93.1%, ArXivMath: 91.2%. Seed 2.0 Mini scores CountBench: 95.5%, VLMsAreBlind: 93.1%, Graphwalks parents <128k: 93.0%, CharXiv-D: 91.9%, LongFact Concepts: 91.4%.

Is Claude Opus 5.5 cheaper than Seed 2.0 Mini?

Seed 2.0 Mini is 40.0x cheaper for input tokens. Claude Opus 5.5 costs $4.00/M input and $20.00/M output via anthropic. Seed 2.0 Mini costs $0.10/M input and $0.40/M output via deepinfra.

What are the context window sizes for Claude Opus 5.5 and Seed 2.0 Mini?

Claude Opus 5.5 supports 1.0M tokens and Seed 2.0 Mini 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 5.5 and Seed 2.0 Mini?

Key differences include LLM Stats Score (60.4 vs 27.8), context window (1.0M vs 256K), input pricing ($4.00 vs $0.10/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 5.5 and Seed 2.0 Mini?

Claude Opus 5.5 is developed by Anthropic and Seed 2.0 Mini is developed by ByteDance.

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