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Claude Opus 5.5 vs Nova 2 Sonic

Claude Opus 5.5 leads the LLM Stats Score 60.4 to 8.6. Nova 2 Sonic is 8.6x cheaper per token.

Anthropic · Amazon · Updated for 2026

Which is better?

Claude Opus 5.5 leads the overall LLM Stats Score 60.4 to 8.6, ranking #1 overall.

On price, Nova 2 Sonic is roughly 8.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

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 — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Nova 2 Sonic

  • cost matters — it's about 8.6x cheaper per token

At a glance

The differences that matter most.

Claude Opus 5.5
Anthropic
Nova 2 Sonic
Amazon
Core performance indexes
LLM Stats Score
60.4
#1
8.6
#296
Reasoning
59.5
#1
11.1
#279
Cost, coverage & limits
Benchmark wins
—
—
Input price
$4.00 / M
$0.33 / M
Output price
$20.00 / M
$2.75 / M
Context window
1,000,000
1,000,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Opus 5.5
Nova 2 Sonic
Tool use
34.3#3
12.3#123
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

31 reported for Claude Opus 5.5 · 4 for Nova 2 Sonic

No common benchmarks found

Claude Opus 5.5 and Nova 2 Sonicdon'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

Nova 2 Sonic costs less

For input processing, Claude Opus 5.5 ($4.00/1M tokens) is 12.1x more expensive than Nova 2 Sonic ($0.33/1M tokens).

For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 7.3x more expensive than Nova 2 Sonic ($2.75/1M tokens).

In conclusion, Claude Opus 5.5 is more expensive than Nova 2 Sonic.*

* 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
Amazon
Nova 2 Sonic
Input tokens$0.33
Output tokens$2.75
Best providerAWS Bedrock
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Both models have the same input context window of 1,000,000 tokens. Claude Opus 5.5 can generate longer responses up to 128,000 tokens, while Nova 2 Sonic is limited to 65,536 tokens.

Anthropic
Claude Opus 5.5
Input1,000,000 tokens
Output128,000 tokens
Amazon
Nova 2 Sonic
Input1,000,000 tokens
Output65,536 tokens
Sat Oct 24 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Opus 5.5 and Nova 2 Sonic 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

Nova 2 Sonic

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

Nova 2 Sonic

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 5.5 was released on 2026-09-22, while Nova 2 Sonic was released on 2025-12-02.

Claude Opus 5.5 is 10 months newer than Nova 2 Sonic.

Claude Opus 5.5

Sep 22, 2026

4 weeks ago

9mo newer
Nova 2 Sonic

Dec 2, 2025

10 months ago

Knowledge Cutoff

When training data ends

Claude Opus 5.5 has a documented knowledge cutoff of 2026-06-01, while Nova 2 Sonic'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 Nova 2 Sonic's cutoff date.

Claude Opus 5.5

Jun 2026

Nova 2 Sonic

—

Provider Availability

Claude Opus 5.5 is available from Anthropic. Nova 2 Sonic is available from Bedrock.

Claude Opus 5.5

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

Nova 2 Sonic

bedrock logo
AWS Bedrock
Input Price:Input: $0.33/1MOutput Price:Output: $2.75/1M
* 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 Nova 2 Sonic side-by-side, then vote on the output you prefer.

Claude Opus 5.5
✓ Preferred
Nova 2 Sonic
Open in Playground

FAQ

Common questions about Claude Opus 5.5 vs Nova 2 Sonic.

Which is better, Claude Opus 5.5 or Nova 2 Sonic?

Claude Opus 5.5 leads the LLM Stats Score 60.4 to 8.6. Claude Opus 5.5 is made by Anthropic and Nova 2 Sonic is made by Amazon. 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 Nova 2 Sonic 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%. Nova 2 Sonic scores Big Bench Audio: 87.0%, BFCL: 74.5%, ComplexFuncBench: 65.2%, IFBench: 37.5%.

Is Claude Opus 5.5 cheaper than Nova 2 Sonic?

Nova 2 Sonic is 12.1x cheaper for input tokens. Claude Opus 5.5 costs $4.00/M input and $20.00/M output via anthropic. Nova 2 Sonic costs $0.33/M input and $2.75/M output via bedrock.

What are the context window sizes for Claude Opus 5.5 and Nova 2 Sonic?

Claude Opus 5.5 supports 1.0M tokens and Nova 2 Sonic supports 1.0M 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 Nova 2 Sonic?

Key differences include LLM Stats Score (60.4 vs 8.6), input pricing ($4.00 vs $0.33/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 5.5 and Nova 2 Sonic?

Claude Opus 5.5 is developed by Anthropic and Nova 2 Sonic is developed by Amazon.

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