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Claude Mythos Preview vs Grok-4.1 Thinking

Claude Mythos Preview leads the LLM Stats Score 54.5 to 16.0. Grok-4.1 Thinking is 8.3x cheaper per token.

Anthropic · xAI · Updated for 2026

Which is better?

Claude Mythos Preview leads the overall LLM Stats Score 54.5 to 16.0, ranking #5 overall.

In the 2 individual benchmarks reported for both models, Claude Mythos Preview wins 2; this is a narrower head-to-head signal than the composite indexes.

On price, Grok-4.1 Thinking is roughly 8.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Mythos Preview

  • overall performance matters — it scores 54.5 and ranks #5 on LLM Stats
  • your work emphasizes coding and agents — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 2 of 2 exact shared results

Choose Grok-4.1 Thinking

  • cost matters — it's about 8.3x cheaper per token

At a glance

The differences that matter most.

Claude Mythos Preview
Anthropic
Grok-4.1 Thinking
xAI
Core performance indexes
LLM Stats Score
54.5
#5
16.0
#241
Coding
44.1
#4
1.0
#250
Agents
36.5
#15
1.3
#184
Cost, coverage & limits
Benchmark wins
2 of 2
0 of 2
Input price
$25.00 / M
$3.00 / M
Output price
$125.00 / M
$15.00 / M
Context window
—
256,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Mythos Preview
Grok-4.1 Thinking
Safety
19.6#9
-0.4#37
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

16 reported for Claude Mythos Preview · 11 for Grok-4.1 Thinking

2 shared

Claude Mythos Preview outperforms in 2 benchmarks (CyBench, FigQA), while Grok-4.1 Thinking is better at 0 benchmarks.

Claude Mythos Preview significantly outperforms across most benchmarks.

Wed Oct 14 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Grok-4.1 Thinking costs less

For input processing, Claude Mythos Preview ($25.00/1M tokens) is 8.3x more expensive than Grok-4.1 Thinking ($3.00/1M tokens).

For output processing, Claude Mythos Preview ($125.00/1M tokens) is 8.3x more expensive than Grok-4.1 Thinking ($15.00/1M tokens).

In conclusion, Claude Mythos Preview is more expensive than Grok-4.1 Thinking.*

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

Lowest available price from all providers
Wed Oct 14 2026 • llm-stats.com
Anthropic
Claude Mythos Preview
Input tokens$25.00
Output tokens$125.00
Best providerAnthropic
xAI
Grok-4.1 Thinking
Input tokens$3.00
Output tokens$15.00
Best providerxAI
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Only Grok-4.1 Thinking specifies input context (256,000 tokens). Only Grok-4.1 Thinking specifies output context (8,000 tokens).

Anthropic
Claude Mythos Preview
Input- tokens
Output- tokens
xAI
Grok-4.1 Thinking
Input256,000 tokens
Output8,000 tokens
Wed Oct 14 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Mythos Preview and Grok-4.1 Thinking support multimodal inputs.

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

Claude Mythos Preview

Text
Images
Audio
Video

Grok-4.1 Thinking

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 Preview

Proprietary

Closed source

Grok-4.1 Thinking

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-4.1 Thinking was released on 2025-11-17, while Claude Mythos Preview's release date is not specified.

We can confirm Grok-4.1 Thinking's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.

Claude Mythos Preview

—

Grok-4.1 Thinking

Nov 17, 2025

11 months 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 Preview is available from Anthropic. Grok-4.1 Thinking is available from xAI.

Claude Mythos Preview

anthropic logo
Anthropic
Input Price:Input: $25.00/1MOutput Price:Output: $125.00/1M

Grok-4.1 Thinking

xai logo
xAI
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Mythos Preview and Grok-4.1 Thinking side-by-side, then vote on the output you prefer.

Claude Mythos Preview
✓ Preferred
Grok-4.1 Thinking
Open in Playground

FAQ

Common questions about Claude Mythos Preview vs Grok-4.1 Thinking.

Which is better, Claude Mythos Preview or Grok-4.1 Thinking?

Claude Mythos Preview leads the LLM Stats Score 54.5 to 16.0. Claude Mythos Preview is made by Anthropic and Grok-4.1 Thinking is made by xAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Mythos Preview compare to Grok-4.1 Thinking in benchmarks?

Claude Mythos Preview scores CyBench: 100.0%, USAMO25: 97.6%, GPQA: 94.6%, SWE-Bench Verified: 93.9%, CharXiv-R: 93.2%. Grok-4.1 Thinking scores Creative Writing v3: 86.1%, WMDP: 84.0%, EQ-Bench: 79.3%, ProtocolQA: 79.0%, LMArena Text Leaderboard: 74.2%.

Is Claude Mythos Preview cheaper than Grok-4.1 Thinking?

Grok-4.1 Thinking is 8.3x cheaper for input tokens. Claude Mythos Preview costs $25.00/M input and $125.00/M output via anthropic. Grok-4.1 Thinking costs $3.00/M input and $15.00/M output via xai.

What are the context window sizes for Claude Mythos Preview and Grok-4.1 Thinking?

Claude Mythos Preview supports an unknown number of tokens and Grok-4.1 Thinking supports 256K 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 Preview and Grok-4.1 Thinking?

Key differences include LLM Stats Score (54.5 vs 16.0), input pricing ($25.00 vs $3.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos Preview and Grok-4.1 Thinking?

Claude Mythos Preview is developed by Anthropic and Grok-4.1 Thinking is developed by xAI.

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