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Claude Mythos 5.1 vs Grok-2 Image 1212

Comparing Claude Mythos 5.1 and Grok-2 Image 1212 across benchmarks, pricing, and capabilities.

Anthropic · xAI · Updated for 2026

Which is better?

Claude Mythos 5.1 and Grok-2 Image 1212 trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

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

  • 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 Grok-2 Image 1212

  • you are already invested in the xAI ecosystem

At a glance

The differences that matter most.

Claude Mythos 5.1
Anthropic
Grok-2 Image 1212
xAI
Benchmark wins
—
—
Input price
$10.00 / M
— / M
Output price
$50.00 / M
— / M
Context window
1,000,000
131,072

Individual benchmarks

1 reported for Claude Mythos 5.1 · 0 for Grok-2 Image 1212

No common benchmarks found

Claude Mythos 5.1 and Grok-2 Image 1212don'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

Context Window

Maximum input and output token capacity

Claude Mythos 5.1 accepts 1,000,000 input tokens compared to Grok-2 Image 1212's 131,072 tokens. Only Claude Mythos 5.1 specifies output context (128,000 tokens).

Anthropic
Claude Mythos 5.1
Input1,000,000 tokens
Output128,000 tokens
xAI
Grok-2 Image 1212
Input131,072 tokens
Output- tokens
Mon Sep 21 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Mythos 5.1 supports multimodal inputs, whereas Grok-2 Image 1212 does not.

Claude Mythos 5.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Mythos 5.1

Text
Images
Audio
Video

Grok-2 Image 1212

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

Grok-2 Image 1212

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Mythos 5.1 was released on 2026-09-01, while Grok-2 Image 1212 was released on 2024-12-12.

Claude Mythos 5.1 is 21 months newer than Grok-2 Image 1212.

Claude Mythos 5.1

Sep 1, 2026

2 weeks ago

1.7yr newer
Grok-2 Image 1212

Dec 12, 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. Grok-2 Image 1212 is available from xAI.

Claude Mythos 5.1

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

Grok-2 Image 1212

xai logo
xAI
* 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 Grok-2 Image 1212 side-by-side, then vote on the output you prefer.

Claude Mythos 5.1
✓ Preferred
Grok-2 Image 1212
Open in Playground

FAQ

Common questions about Claude Mythos 5.1 vs Grok-2 Image 1212.

Which is better, Claude Mythos 5.1 or Grok-2 Image 1212?

Claude Mythos 5.1 (Anthropic) and Grok-2 Image 1212 (xAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Claude Mythos 5.1 compare to Grok-2 Image 1212 in benchmarks?

Claude Mythos 5.1 scores Terminal-Bench 4.0: 60.9%.

What are the context window sizes for Claude Mythos 5.1 and Grok-2 Image 1212?

Claude Mythos 5.1 supports 1.0M tokens and Grok-2 Image 1212 supports 131K 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 Grok-2 Image 1212?

Key differences include context window (1.0M vs 131K), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos 5.1 and Grok-2 Image 1212?

Claude Mythos 5.1 is developed by Anthropic and Grok-2 Image 1212 is developed by xAI.

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