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Claude Mythos 5.1 vs Nova Pro

Claude Mythos 5.1 leads the LLM Stats Score 45.1 to 12.3. Nova Pro is 14.3x cheaper per token.

Anthropic · Amazon · Updated for 2026

Which is better?

Claude Mythos 5.1 leads the overall LLM Stats Score 45.1 to 12.3, ranking #31 overall.

On price, Nova Pro is roughly 14.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Mythos 5.1 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 Mythos 5.1

  • overall performance matters — it scores 45.1 and ranks #31 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 14.3x cheaper per token

At a glance

The differences that matter most.

Claude Mythos 5.1
Anthropic
Nova Pro
Amazon
Core performance indexes
LLM Stats Score
45.1
#31
12.3
#250
Reasoning
44.4
#34
12.1
#245
Coding
37.5
#17
10.1
#163
Agents
34.5
#21
10.2
#116
Cost, coverage & limits
Benchmark wins
—
—
Input price
$10.00 / M
$0.80 / M
Output price
$50.00 / M
$3.20 / M
Context window
1,000,000
300,000

Individual benchmarks

1 reported for Claude Mythos 5.1 · 27 for Nova Pro

No common benchmarks found

Claude Mythos 5.1 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 Mythos 5.1 ($10.00/1M tokens) is 12.5x more expensive than Nova Pro ($0.80/1M tokens).

For output processing, Claude Mythos 5.1 ($50.00/1M tokens) is 15.6x more expensive than Nova Pro ($3.20/1M tokens).

In conclusion, Claude Mythos 5.1 is more expensive than Nova Pro.*

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

Lowest available price from all providers
Wed Sep 09 2026 • llm-stats.com
Anthropic
Claude Mythos 5.1
Input tokens$10.00
Output tokens$50.00
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 Mythos 5.1 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 Mythos 5.1 is limited to 128,000 tokens.

Anthropic
Claude Mythos 5.1
Input1,000,000 tokens
Output128,000 tokens
Amazon
Nova Pro
Input300,000 tokens
Output300,000 tokens
Wed Sep 09 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Mythos 5.1 and Nova Pro support multimodal inputs.

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

Claude Mythos 5.1

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 Mythos 5.1

Proprietary

Closed source

Nova Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Mythos 5.1 was released on 2026-09-01, while Nova Pro was released on 2024-11-20.

Claude Mythos 5.1 is 22 months newer than Nova Pro.

Claude Mythos 5.1

Sep 1, 2026

1 weeks ago

1.8yr newer
Nova Pro

Nov 20, 2024

1.8 years ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude Mythos 5.1 is available from Anthropic. Nova Pro is available from Bedrock.

Claude Mythos 5.1

anthropic logo
Anthropic
Input Price:Input: $10.00/1MOutput Price:Output: $50.00/1M

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 Mythos 5.1 and Nova Pro side-by-side, then vote on the output you prefer.

Claude Mythos 5.1
✓ Preferred
Nova Pro
Open in Playground

FAQ

Common questions about Claude Mythos 5.1 vs Nova Pro.

Which is better, Claude Mythos 5.1 or Nova Pro?

Claude Mythos 5.1 leads the LLM Stats Score 45.1 to 12.3. Claude Mythos 5.1 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 Mythos 5.1 compare to Nova Pro in benchmarks?

Claude Mythos 5.1 scores Terminal-Bench 4.0: 60.9%. Nova Pro scores ARC-C: 94.8%, GSM8k: 94.8%, DocVQA: 93.5%, IFEval: 92.1%, ChartQA: 89.2%.

Is Claude Mythos 5.1 cheaper than Nova Pro?

Nova Pro is 12.5x cheaper for input tokens. Claude Mythos 5.1 costs $10.00/M input and $50.00/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 Mythos 5.1 and Nova Pro?

Claude Mythos 5.1 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 Mythos 5.1 and Nova Pro?

Key differences include LLM Stats Score (45.1 vs 12.3), context window (1.0M vs 300K), input pricing ($10.00 vs $0.80/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos 5.1 and Nova Pro?

Claude Mythos 5.1 is developed by Anthropic and Nova Pro is developed by Amazon.

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