Model Comparison
Claude Sonnet 4.5 vs Nova ProWhich is better in 2026?
Claude Sonnet 4.5 significantly outperforms across most benchmarks. Nova Pro is 4.3x cheaper per token.
Verdict: Claude Sonnet 4.5 vs Nova Pro — which is better?
Claude Sonnet 4.5 (by Anthropic) and Nova Pro (by Amazon) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
Claude Sonnet 4.5 outperforms in 1 benchmarks (GPQA), while Nova Pro is better at 0 benchmarks. Claude Sonnet 4.5 significantly outperforms across most benchmarks.
On price, Nova Pro is roughly 4.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Nova Pro also accepts a larger context window (300,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose Claude Sonnet 4.5 if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- you want the most recent training data — it shipped Sep 2025
Choose Nova Pro if…
- cost matters — it's about 4.3x cheaper per token
- you process long inputs — it offers a 300,000 token context window
Performance Benchmarks
Comparative analysis across standard metrics
Claude Sonnet 4.5 outperforms in 1 benchmarks (GPQA), while Nova Pro is better at 0 benchmarks.
Claude Sonnet 4.5 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Sonnet 4.5 ($3.00/1M tokens) is 3.8x more expensive than Nova Pro ($0.80/1M tokens).
For output processing, Claude Sonnet 4.5 ($15.00/1M tokens) is 4.7x more expensive than Nova Pro ($3.20/1M tokens).
In conclusion, Claude Sonnet 4.5 is more expensive than Nova Pro.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Nova Pro accepts 300,000 input tokens compared to Claude Sonnet 4.5's 200,000 tokens. Nova Pro can generate longer responses up to 300,000 tokens, while Claude Sonnet 4.5 is limited to 64,000 tokens.
Input Capabilities
Supported data types and modalities
Both Claude Sonnet 4.5 and Nova Pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Sonnet 4.5
Nova Pro
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude Sonnet 4.5 was released on 2025-09-29, while Nova Pro was released on 2024-11-20.
Claude Sonnet 4.5 is 10 months newer than Nova Pro.
Sep 29, 2025
9 months ago
10mo newerNov 20, 2024
1.7 years ago
Knowledge Cutoff
When training data ends
Claude Sonnet 4.5 has a documented knowledge cutoff of 2025-01-31, while Nova Pro's cutoff date is not specified.
We can confirm Claude Sonnet 4.5's training data extends to 2025-01-31, but cannot make a direct comparison without Nova Pro's cutoff date.
Jan 2025
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Provider Availability
Claude Sonnet 4.5 is available from Anthropic. Nova Pro is available from Bedrock.
Claude Sonnet 4.5
Nova Pro
Outputs Comparison
Key Takeaways
Claude Sonnet 4.5
View detailsAnthropic
Nova Pro
View detailsAmazon
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Claude Sonnet 4.5 and Nova Pro side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Claude Sonnet 4.5 vs Nova Pro.