Model Comparison

Claude Mythos Preview vs Kimi K3Which is better in 2026?

Claude Mythos Preview shows notably better performance in the majority of benchmarks. Kimi K3 is 8.3x cheaper per token.

Verdict: Claude Mythos Preview vs Kimi K3 — which is better?

Claude Mythos Preview (by Anthropic) and Kimi K3 (by Moonshot AI) 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 Mythos Preview outperforms in 3 benchmarks (CharXiv-R, GPQA, Humanity's Last Exam), while Kimi K3 is better at 1 benchmark (BrowseComp). Claude Mythos Preview shows notably better performance in the majority of benchmarks.

On price, Kimi K3 is roughly 8.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Choose Claude Mythos Preview if…

  • you want the strongest raw capability — it leads on 3 of 4 shared benchmarks

Choose Kimi K3 if…

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

Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Claude Mythos Preview outperforms in 3 benchmarks (CharXiv-R, GPQA, Humanity's Last Exam), while Kimi K3 is better at 1 benchmark (BrowseComp).

Claude Mythos Preview shows notably better performance in the majority of benchmarks.

Wed Jul 22 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K3 costs less

For input processing, Claude Mythos Preview ($25.00/1M tokens) is 8.3x more expensive than Kimi K3 ($3.00/1M tokens).

For output processing, Claude Mythos Preview ($125.00/1M tokens) is 8.3x more expensive than Kimi K3 ($15.00/1M tokens).

In conclusion, Claude Mythos Preview is more expensive than Kimi K3.*

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

Lowest available price from all providers
Wed Jul 22 2026 • llm-stats.com
Anthropic
Claude Mythos Preview
Input tokens$25.00
Output tokens$125.00
Best providerAnthropic
Moonshot AI
Kimi K3
Input tokens$3.00
Output tokens$15.00
Best providerUnknown Organization
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Only Kimi K3 specifies input context (1,048,576 tokens). Only Kimi K3 specifies output context (1,048,576 tokens).

Anthropic
Claude Mythos Preview
Input- tokens
Output- tokens
Moonshot AI
Kimi K3
Input1,048,576 tokens
Output1,048,576 tokens
Wed Jul 22 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Mythos Preview and Kimi K3 support multimodal inputs.

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

Claude Mythos Preview

Text
Images
Audio
Video

Kimi K3

Text
Images
Audio
Video

Release Timeline

When each model was launched

Kimi K3 was released on 2026-07-16, while Claude Mythos Preview's release date is not specified.

We can confirm Kimi K3's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.

Claude Mythos Preview

—

Kimi K3

Jul 16, 2026

5 days 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. Kimi K3 is available from Moonshot AI.

Claude Mythos Preview

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

Kimi K3

moonshot logo
Unknown Organization
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Higher CharXiv-R score (93.2% vs 91.3%)
Higher GPQA score (94.6% vs 93.5%)
Higher Humanity's Last Exam score (64.7% vs 56.0%)
Moonshot AI
Larger context window (1,048,576 tokens)
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher BrowseComp score (91.2% vs 86.9%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Mythos Preview and Kimi K3 side-by-side, then vote on the output you prefer.

Claude Mythos Preview
✓ Preferred
Kimi K3
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Mythos Preview
Moonshot AI
Kimi K3

FAQ

Common questions about Claude Mythos Preview vs Kimi K3.

Which is better, Claude Mythos Preview or Kimi K3?

Claude Mythos Preview shows notably better performance in the majority of benchmarks. Claude Mythos Preview is made by Anthropic and Kimi K3 is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Mythos Preview compare to Kimi K3 in benchmarks?

Claude Mythos Preview scores CyBench: 100.0%, USAMO25: 97.6%, GPQA: 94.6%, SWE-Bench Verified: 93.9%, CharXiv-R: 93.2%. Kimi K3 scores MathVision: 97.8%, DeepSearchQA: 95.0%, GPQA: 93.5%, CharXiv-R: 91.3%, BrowseComp: 91.2%.

Is Claude Mythos Preview cheaper than Kimi K3?

Kimi K3 is 8.3x cheaper for input tokens. Claude Mythos Preview costs $25.00/M input and $125.00/M output via anthropic. Kimi K3 costs $3.00/M input and $15.00/M output via moonshot.

What are the context window sizes for Claude Mythos Preview and Kimi K3?

Claude Mythos Preview supports an unknown number of tokens and Kimi K3 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 Preview and Kimi K3?

Key differences include input pricing ($25.00 vs $3.00/M), licensing (Proprietary vs Unknown). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos Preview and Kimi K3?

Claude Mythos Preview is developed by Anthropic and Kimi K3 is developed by Moonshot AI.

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