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Claude Mythos 5.2 vs SWE-2 Flash

Claude Mythos 5.2 leads the LLM Stats Score 59.6 to 43.8.

Anthropic · Cognition · Updated for 2026

Which is better?

Claude Mythos 5.2 leads the overall LLM Stats Score 59.6 to 43.8, ranking #2 overall.

In the 1 individual benchmarks reported for both models, Claude Mythos 5.2 wins 1; this is a narrower head-to-head signal than the composite indexes.

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

Choose Claude Mythos 5.2

  • overall performance matters — it scores 59.6 and ranks #2 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Nov 2026

Choose SWE-2 Flash

  • you are already invested in the Cognition ecosystem

At a glance

The differences that matter most.

Claude Mythos 5.2
Anthropic
SWE-2 Flash
Cognition
Core performance indexes
LLM Stats Score
59.6
#2
43.8
#59
Reasoning
53.6
#7
42.6
#61
Coding
44.6
#5
33.0
#44
Agents
44.1
#2
30.1
#50
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
$8.00 / M
— / M
Output price
$40.00 / M
— / M
Context window
1,000,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Mythos 5.2
SWE-2 Flash
Tool use
38.5#1
23.0#58
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

9 reported for Claude Mythos 5.2 · 7 for SWE-2 Flash

1 shared

Claude Mythos 5.2 outperforms in 1 benchmarks (Terminal-Bench 4.0), while SWE-2 Flash is better at 0 benchmarks.

Claude Mythos 5.2 significantly outperforms across most benchmarks.

Thu Nov 12 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Claude Mythos 5.2 specifies input context (1,000,000 tokens). Only Claude Mythos 5.2 specifies output context (128,000 tokens).

Anthropic
Claude Mythos 5.2
Input1,000,000 tokens
Output128,000 tokens
Cognition
SWE-2 Flash
Input- tokens
Output- tokens
Thu Nov 12 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Mythos 5.2 supports multimodal inputs, whereas SWE-2 Flash does not.

Claude Mythos 5.2 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Mythos 5.2

Text
Images
Audio
Video

SWE-2 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 5.2

Proprietary

Closed source

SWE-2 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Mythos 5.2 was released on 2026-11-09, while SWE-2 Flash was released on 2026-11-04.

Claude Mythos 5.2 is 0 month newer than SWE-2 Flash.

Claude Mythos 5.2

Nov 9, 2026

3 days ago

5d newer
SWE-2 Flash

Nov 4, 2026

1 weeks ago

Knowledge Cutoff

When training data ends

Claude Mythos 5.2 has a documented knowledge cutoff of 2026-06-01, while SWE-2 Flash's cutoff date is not specified.

We can confirm Claude Mythos 5.2's training data extends to 2026-06-01, but cannot make a direct comparison without SWE-2 Flash's cutoff date.

Claude Mythos 5.2

Jun 2026

SWE-2 Flash

—

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Mythos 5.2 and SWE-2 Flash side-by-side, then vote on the output you prefer.

Claude Mythos 5.2
✓ Preferred
SWE-2 Flash
Open in Playground

FAQ

Common questions about Claude Mythos 5.2 vs SWE-2 Flash.

Which is better, Claude Mythos 5.2 or SWE-2 Flash?

Claude Mythos 5.2 leads the LLM Stats Score 59.6 to 43.8. Claude Mythos 5.2 is made by Anthropic and SWE-2 Flash is made by Cognition. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Mythos 5.2 compare to SWE-2 Flash in benchmarks?

Claude Mythos 5.2 scores De novo protein binder design: 85.1%, Biomedical image analysis: 80.7%, Protocols Troubleshooting: 77.1%, Terminal-Bench-Science 0.1: 75.3%, Terminal-Bench 4.0: 70.5%. SWE-2 Flash scores Terminal-Bench 2.1: 89.2%, DeepSWE 1.1: 60.1%, SWE Atlas - Codebase QnA: 50.0%, FrontierCode 1.1: 45.5%, ExploitBench: 34.8%.

What are the context window sizes for Claude Mythos 5.2 and SWE-2 Flash?

Claude Mythos 5.2 supports 1.0M tokens and SWE-2 Flash supports an unknown number of 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 5.2 and SWE-2 Flash?

Key differences include LLM Stats Score (59.6 vs 43.8), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos 5.2 and SWE-2 Flash?

Claude Mythos 5.2 is developed by Anthropic and SWE-2 Flash is developed by Cognition.

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