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Claude Opus 5.5 vs Nova Pro

Claude Opus 5.5 leads the LLM Stats Score 59.7 to 12.3. Nova Pro is 5.7x cheaper per token.

Anthropic · Amazon · Updated for 2026

Which is better?

Claude Opus 5.5 leads the overall LLM Stats Score 59.7 to 12.3, ranking #1 overall.

On price, Nova Pro is roughly 5.7x 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 59.7 and ranks #1 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • 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 Nova Pro

  • cost matters — it's about 5.7x cheaper per token

At a glance

The differences that matter most.

Claude Opus 5.5
Anthropic
Nova Pro
Amazon
Core performance indexes
LLM Stats Score
59.7
#1
12.3
#258
Reasoning
57.8
#1
12.0
#253
Coding
51.7
#1
10.1
#171
Agents
44.5
#2
10.2
#123
Cost, coverage & limits
Benchmark wins
—
—
Input price
$4.00 / M
$0.80 / M
Output price
$20.00 / M
$3.20 / M
Context window
1,000,000
300,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Claude Opus 5.5
Nova Pro
Math
42.5#5
18.9#174
Vision
42.8#1
5.6#155
Multimodal
42.5#1
8.4#131
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

31 reported for Claude Opus 5.5 · 27 for Nova Pro

No common benchmarks found

Claude Opus 5.5 and Nova Prodon'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 Pro costs less

For input processing, Claude Opus 5.5 ($4.00/1M tokens) is 5.0x more expensive than Nova Pro ($0.80/1M tokens).

For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 6.3x more expensive than Nova Pro ($3.20/1M tokens).

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

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

Lowest available price from all providers
Tue Sep 22 2026 • llm-stats.com
Anthropic
Claude Opus 5.5
Input tokens$4.00
Output tokens$20.00
Best providerAnthropic
Amazon
Nova Pro
Input tokens$0.80
Output tokens$3.20
Best providerAWS Bedrock
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Opus 5.5 accepts 1,000,000 input tokens compared to Nova Pro's 300,000 tokens. Nova Pro can generate longer responses up to 300,000 tokens, while Claude Opus 5.5 is limited to 128,000 tokens.

Anthropic
Claude Opus 5.5
Input1,000,000 tokens
Output128,000 tokens
Amazon
Nova Pro
Input300,000 tokens
Output300,000 tokens
Tue Sep 22 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Opus 5.5 and Nova Pro 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 Pro

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 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 5.5 was released on 2026-09-22, while Nova Pro was released on 2024-11-20.

Claude Opus 5.5 is 22 months newer than Nova Pro.

Claude Opus 5.5

Sep 22, 2026

0 days ago

1.8yr newer
Nova Pro

Nov 20, 2024

1.8 years ago

Knowledge Cutoff

When training data ends

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

Claude Opus 5.5

Jun 2026

Nova Pro

—

Provider Availability

Claude Opus 5.5 is available from Anthropic. Nova Pro is available from Bedrock.

Claude Opus 5.5

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

Nova Pro

bedrock logo
AWS Bedrock
Input Price:Input: $0.80/1MOutput Price:Output: $3.20/1M
* 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 5.5 and Nova Pro side-by-side, then vote on the output you prefer.

Claude Opus 5.5
✓ Preferred
Nova Pro
Open in Playground

FAQ

Common questions about Claude Opus 5.5 vs Nova Pro.

Which is better, Claude Opus 5.5 or Nova Pro?

Claude Opus 5.5 leads the LLM Stats Score 59.7 to 12.3. Claude Opus 5.5 is made by Anthropic and Nova Pro 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 Pro 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 Pro scores ARC-C: 94.8%, GSM8k: 94.8%, DocVQA: 93.5%, IFEval: 92.1%, ChartQA: 89.2%.

Is Claude Opus 5.5 cheaper than Nova Pro?

Nova Pro is 5.0x cheaper for input tokens. Claude Opus 5.5 costs $4.00/M input and $20.00/M output via anthropic. Nova Pro costs $0.80/M input and $3.20/M output via bedrock.

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

Claude Opus 5.5 supports 1.0M tokens and Nova Pro supports 300K 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 Pro?

Key differences include LLM Stats Score (59.7 vs 12.3), context window (1.0M vs 300K), input pricing ($4.00 vs $0.80/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 5.5 and Nova Pro?

Claude Opus 5.5 is developed by Anthropic and Nova Pro is developed by Amazon.

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