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Claude Opus 5.5 vs Nova Micro

Claude Opus 5.5 leads the LLM Stats Score 59.7 to 2.4. Nova Micro is 139.1x cheaper per token.

Anthropic · Amazon · Updated for 2026

Which is better?

Claude Opus 5.5 leads the overall LLM Stats Score 59.7 to 2.4, ranking #1 overall.

On price, Nova Micro is roughly 139.1x 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 Micro

  • cost matters — it's about 139.1x cheaper per token

At a glance

The differences that matter most.

Claude Opus 5.5
Anthropic
Nova Micro
Amazon
Core performance indexes
LLM Stats Score
59.7
#1
2.4
#320
Reasoning
57.8
#1
1.7
#315
Coding
51.7
#1
2.6
#229
Cost, coverage & limits
Benchmark wins
—
—
Input price
$4.00 / M
$0.03 / M
Output price
$20.00 / M
$0.14 / M
Context window
1,000,000
128,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Opus 5.5
Nova Micro
Math
42.5#5
9.2#255
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

31 reported for Claude Opus 5.5 · 17 for Nova Micro

No common benchmarks found

Claude Opus 5.5 and Nova Microdon'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 Micro costs less

For input processing, Claude Opus 5.5 ($4.00/1M tokens) is 133.3x more expensive than Nova Micro ($0.03/1M tokens).

For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 142.9x more expensive than Nova Micro ($0.14/1M tokens).

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

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

Lowest available price from all providers
Wed Sep 23 2026 • llm-stats.com
Anthropic
Claude Opus 5.5
Input tokens$4.00
Output tokens$20.00
Best providerAnthropic
Amazon
Nova Micro
Input tokens$0.03
Output tokens$0.14
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 Micro's 128,000 tokens. Both models can generate responses up to 128,000 tokens.

Anthropic
Claude Opus 5.5
Input1,000,000 tokens
Output128,000 tokens
Amazon
Nova Micro
Input128,000 tokens
Output128,000 tokens
Wed Sep 23 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Opus 5.5 supports multimodal inputs, whereas Nova Micro does not.

Claude Opus 5.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 5.5

Text
Images
Audio
Video

Nova Micro

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 Micro

Proprietary

Closed source

Release Timeline

When each model was launched

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

Claude Opus 5.5 is 22 months newer than Nova Micro.

Claude Opus 5.5

Sep 22, 2026

0 days ago

1.8yr newer
Nova Micro

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 Micro'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 Micro's cutoff date.

Claude Opus 5.5

Jun 2026

Nova Micro

—

Provider Availability

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

Claude Opus 5.5

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

Nova Micro

bedrock logo
AWS Bedrock
Input Price:Input: $0.03/1MOutput Price:Output: $0.14/1M
* 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 Micro side-by-side, then vote on the output you prefer.

Claude Opus 5.5
✓ Preferred
Nova Micro
Open in Playground

FAQ

Common questions about Claude Opus 5.5 vs Nova Micro.

Which is better, Claude Opus 5.5 or Nova Micro?

Claude Opus 5.5 leads the LLM Stats Score 59.7 to 2.4. Claude Opus 5.5 is made by Anthropic and Nova Micro 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 Micro 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 Micro scores GSM8k: 92.3%, ARC-C: 90.2%, Translation Set1→en COMET22: 88.7%, Translation en→Set1 COMET22: 88.5%, IFEval: 87.2%.

Is Claude Opus 5.5 cheaper than Nova Micro?

Nova Micro is 133.3x cheaper for input tokens. Claude Opus 5.5 costs $4.00/M input and $20.00/M output via anthropic. Nova Micro costs $0.03/M input and $0.14/M output via bedrock.

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

Claude Opus 5.5 supports 1.0M tokens and Nova Micro supports 128K 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 Micro?

Key differences include LLM Stats Score (59.7 vs 2.4), context window (1.0M vs 128K), input pricing ($4.00 vs $0.03/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 5.5 and Nova Micro?

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

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