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Claude Mythos Preview vs Qwen3.8 Flash

Claude Mythos Preview leads the LLM Stats Score 55.7 to 49.6. Qwen3.8 Flash is 217.4x cheaper per token.

Anthropic · Alibaba Cloud / Qwen Team · Updated for 2026

Which is better?

Claude Mythos Preview leads the overall LLM Stats Score 55.7 to 49.6, ranking #3 overall.

In the 5 individual benchmarks reported for both models, Claude Mythos Preview wins 5; this is a narrower head-to-head signal than the composite indexes.

On price, Qwen3.8 Flash is roughly 217.4x 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 55.7 and ranks #3 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 5 of 5 exact shared results

Choose Qwen3.8 Flash

  • cost matters — it's about 217.4x cheaper per token

At a glance

The differences that matter most.

Claude Mythos Preview
Anthropic
Qwen3.8 Flash
Alibaba Cloud / Qwen Team
Core performance indexes
LLM Stats Score
55.7
#3
49.6
#16
Reasoning
56.5
#1
49.2
#16
Coding
45.3
#3
36.6
#20
Agents
36.8
#12
35.5
#14
Cost, coverage & limits
Benchmark wins
5 of 5
0 of 5
Input price
$25.00 / M
$0.15 / M
Output price
$125.00 / M
$0.47 / M
Context window
—
1,000,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Claude Mythos Preview
Qwen3.8 Flash
Math
47.4#1
32.6#55
Vision
39.6#1
34.4#13
Multimodal
37.0#6
36.2#8
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

16 reported for Claude Mythos Preview · 22 for Qwen3.8 Flash

5 shared

Claude Mythos Preview outperforms in 5 benchmarks (CharXiv-R, GPQA, Humanity's Last Exam, SWE-bench Multilingual, SWE-Bench Pro), while Qwen3.8 Flash is better at 0 benchmarks.

Claude Mythos Preview significantly outperforms across most benchmarks.

Mon Aug 31 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Qwen3.8 Flash costs less

For input processing, Claude Mythos Preview ($25.00/1M tokens) is 166.7x more expensive than Qwen3.8 Flash ($0.15/1M tokens).

For output processing, Claude Mythos Preview ($125.00/1M tokens) is 266.0x more expensive than Qwen3.8 Flash ($0.47/1M tokens).

In conclusion, Claude Mythos Preview is more expensive than Qwen3.8 Flash.*

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

Lowest available price from all providers
Mon Aug 31 2026 • llm-stats.com
Anthropic
Claude Mythos Preview
Input tokens$25.00
Output tokens$125.00
Best providerAnthropic
Alibaba Cloud / Qwen Team
Qwen3.8 Flash
Input tokens$0.15
Output tokens$0.47
Best providerNovita
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Only Qwen3.8 Flash specifies input context (1,000,000 tokens). Only Qwen3.8 Flash specifies output context (131,072 tokens).

Anthropic
Claude Mythos Preview
Input- tokens
Output- tokens
Alibaba Cloud / Qwen Team
Qwen3.8 Flash
Input1,000,000 tokens
Output131,072 tokens
Mon Aug 31 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Mythos Preview and Qwen3.8 Flash support multimodal inputs.

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

Claude Mythos Preview

Text
Images
Audio
Video

Qwen3.8 Flash

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

Qwen3.8 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Qwen3.8 Flash was released on 2026-08-26, while Claude Mythos Preview's release date is not specified.

We can confirm Qwen3.8 Flash's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.

Claude Mythos Preview

—

Qwen3.8 Flash

Aug 26, 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. Qwen3.8 Flash is available from Novita.

Claude Mythos Preview

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

Qwen3.8 Flash

novita logo
Novita
Input Price:Input: $0.15/1MOutput Price:Output: $0.47/1M
* 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 Preview and Qwen3.8 Flash side-by-side, then vote on the output you prefer.

Claude Mythos Preview
✓ Preferred
Qwen3.8 Flash
Open in Playground

FAQ

Common questions about Claude Mythos Preview vs Qwen3.8 Flash.

Which is better, Claude Mythos Preview or Qwen3.8 Flash?

Claude Mythos Preview leads the LLM Stats Score 55.7 to 49.6. Claude Mythos Preview is made by Anthropic and Qwen3.8 Flash is made by Alibaba Cloud / Qwen Team. 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 Qwen3.8 Flash in benchmarks?

Claude Mythos Preview scores CyBench: 100.0%, USAMO25: 97.6%, GPQA: 94.6%, SWE-Bench Verified: 93.9%, CharXiv-R: 93.2%. Qwen3.8 Flash scores MathVision: 95.7%, LiveCodeBench v6: 91.9%, GPQA: 91.7%, CharXiv-R: 90.6%, RealWorldQA: 88.5%.

Is Claude Mythos Preview cheaper than Qwen3.8 Flash?

Qwen3.8 Flash is 166.7x cheaper for input tokens. Claude Mythos Preview costs $25.00/M input and $125.00/M output via anthropic. Qwen3.8 Flash costs $0.15/M input and $0.47/M output via novita.

What are the context window sizes for Claude Mythos Preview and Qwen3.8 Flash?

Claude Mythos Preview supports an unknown number of tokens and Qwen3.8 Flash 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 Qwen3.8 Flash?

Key differences include LLM Stats Score (55.7 vs 49.6), input pricing ($25.00 vs $0.15/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos Preview and Qwen3.8 Flash?

Claude Mythos Preview is developed by Anthropic and Qwen3.8 Flash is developed by Alibaba Cloud / Qwen Team.

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