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o1-preview vs SWE-2 Flash

SWE-2 Flash leads the LLM Stats Score 43.8 to 15.9.

OpenAI · Cognition · Updated for 2026

Which is better?

SWE-2 Flash leads the overall LLM Stats Score 43.8 to 15.9, ranking #59 overall.

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

Choose o1-preview

  • you want predictable pricing at $15.00/M input and $60.00/M output

Choose SWE-2 Flash

  • overall performance matters — it scores 43.8 and ranks #59 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you want the most recent training data — it shipped Nov 2026

At a glance

The differences that matter most.

o1-preview
OpenAI
SWE-2 Flash
Cognition
Core performance indexes
LLM Stats Score
15.9
#267
43.8
#59
Reasoning
16.1
#259
42.6
#61
Coding
-4.0
#297
33.0
#44
Cost, coverage & limits
Benchmark wins
—
—
Input price
$15.00 / M
— / M
Output price
$60.00 / M
— / M
Context window
128,000
—

Individual benchmarks

8 reported for o1-preview · 7 for SWE-2 Flash

No common benchmarks found

o1-preview and SWE-2 Flashdon'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

Only o1-preview specifies input context (128,000 tokens). Only o1-preview specifies output context (32,768 tokens).

OpenAI
o1-preview
Input128,000 tokens
Output32,768 tokens
Cognition
SWE-2 Flash
Input- tokens
Output- tokens
Thu Nov 12 2026 • llm-stats.com

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

o1-preview

Proprietary

Closed source

SWE-2 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

o1-preview was released on 2024-09-12, while SWE-2 Flash was released on 2026-11-04.

SWE-2 Flash is 26 months newer than o1-preview.

o1-preview

Sep 12, 2024

2.2 years ago

SWE-2 Flash

Nov 4, 2026

1 weeks ago

2.1yr newer

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

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against o1-preview and SWE-2 Flash side-by-side, then vote on the output you prefer.

o1-preview
✓ Preferred
SWE-2 Flash
Open in Playground

FAQ

Common questions about o1-preview vs SWE-2 Flash.

Which is better, o1-preview or SWE-2 Flash?

SWE-2 Flash leads the LLM Stats Score 43.8 to 15.9. o1-preview is made by OpenAI 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 o1-preview compare to SWE-2 Flash in benchmarks?

o1-preview scores MGSM: 90.8%, MMLU: 90.8%, MATH: 85.5%, GPQA: 73.3%, LiveBench: 52.3%. 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 o1-preview and SWE-2 Flash?

o1-preview supports 128K 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 o1-preview and SWE-2 Flash?

Key differences include LLM Stats Score (15.9 vs 43.8). See the full comparison above for benchmark-by-benchmark results.

Who makes o1-preview and SWE-2 Flash?

o1-preview is developed by OpenAI and SWE-2 Flash is developed by Cognition.

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