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Claude Mythos 5.1 vs Particle-1

Claude Mythos 5.1 leads the LLM Stats Score 44.1 to 32.0. Particle-1 is 45.7x cheaper per token.

Anthropic · Particle AI · Updated for 2026

Which is better?

Claude Mythos 5.1 leads the overall LLM Stats Score 44.1 to 32.0, ranking #53 overall.

On price, Particle-1 is roughly 45.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Particle-1 also accepts a larger context window (1,048,576 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 44.1 and ranks #53 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes

Choose Particle-1

  • cost matters — it's about 45.7x cheaper per token
  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Oct 2026

At a glance

The differences that matter most.

Claude Mythos 5.1
Anthropic
Particle-1
Particle AI
Core performance indexes
LLM Stats Score
44.1
#53
32.0
#135
Reasoning
42.8
#56
31.2
#137
Cost, coverage & limits
Benchmark wins
—
—
Input price
$10.00 / M
$0.25 / M
Output price
$50.00 / M
$1.00 / M
Context window
1,000,000
1,048,576

Individual benchmarks

1 reported for Claude Mythos 5.1 · 3 for Particle-1

No common benchmarks found

Claude Mythos 5.1 and Particle-1don'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

Particle-1 costs less

For input processing, Claude Mythos 5.1 ($10.00/1M tokens) is 40.0x more expensive than Particle-1 ($0.25/1M tokens).

For output processing, Claude Mythos 5.1 ($50.00/1M tokens) is 50.0x more expensive than Particle-1 ($1.00/1M tokens).

In conclusion, Claude Mythos 5.1 is more expensive than Particle-1.*

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

Lowest available price from all providers
Sun Nov 08 2026 • llm-stats.com
Anthropic
Claude Mythos 5.1
Input tokens$10.00
Output tokens$50.00
Best providerAnthropic
Particle AI
Particle-1
Input tokens$0.25
Output tokens$1.00
Best providerUnknown Organization
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Particle-1 accepts 1,048,576 input tokens compared to Claude Mythos 5.1's 1,000,000 tokens. Particle-1 can generate longer responses up to 131,072 tokens, while Claude Mythos 5.1 is limited to 128,000 tokens.

Anthropic
Claude Mythos 5.1
Input1,000,000 tokens
Output128,000 tokens
Particle AI
Particle-1
Input1,048,576 tokens
Output131,072 tokens
Sun Nov 08 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Mythos 5.1 and Particle-1 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

Particle-1

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

Particle-1

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Mythos 5.1 was released on 2026-09-01, while Particle-1 was released on 2026-10-28.

Particle-1 is 2 months newer than Claude Mythos 5.1.

Claude Mythos 5.1

Sep 1, 2026

2 months ago

Particle-1

Oct 28, 2026

1 weeks ago

1mo newer

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. Particle-1 is available from Particle AI.

Claude Mythos 5.1

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

Particle-1

particle-ai logo
Unknown Organization
Input Price:Input: $0.25/1MOutput Price:Output: $1.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Mythos 5.1 and Particle-1 side-by-side, then vote on the output you prefer.

Claude Mythos 5.1
✓ Preferred
Particle-1
Open in Playground

FAQ

Common questions about Claude Mythos 5.1 vs Particle-1.

Which is better, Claude Mythos 5.1 or Particle-1?

Claude Mythos 5.1 leads the LLM Stats Score 44.1 to 32.0. Claude Mythos 5.1 is made by Anthropic and Particle-1 is made by Particle AI. 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 Particle-1 in benchmarks?

Claude Mythos 5.1 scores Terminal-Bench 4.0: 60.9%. Particle-1 scores GPQA: 90.4%, BabyVision: 89.2%, MMLU: 86.1%.

Is Claude Mythos 5.1 cheaper than Particle-1?

Particle-1 is 40.0x cheaper for input tokens. Claude Mythos 5.1 costs $10.00/M input and $50.00/M output via anthropic. Particle-1 costs $0.25/M input and $1.00/M output via particle-ai.

What are the context window sizes for Claude Mythos 5.1 and Particle-1?

Claude Mythos 5.1 supports 1.0M tokens and Particle-1 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 Mythos 5.1 and Particle-1?

Key differences include LLM Stats Score (44.1 vs 32.0), context window (1.0M vs 1.0M), input pricing ($10.00 vs $0.25/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos 5.1 and Particle-1?

Claude Mythos 5.1 is developed by Anthropic and Particle-1 is developed by Particle AI.

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