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GPT OSS 20B High vs LongCat-Flash-Thinking-2601

LongCat-Flash-Thinking-2601 significantly outperforms across most benchmarks. GPT OSS 20B High is 2.6x cheaper per token.

OpenAI · Meituan · Updated for 2026

Which is better?

GPT OSS 20B High outperforms in 0 benchmarks, while LongCat-Flash-Thinking-2601 is better at 2 benchmarks (AIME 2025, GPQA). LongCat-Flash-Thinking-2601 significantly outperforms across most benchmarks.

On price, GPT OSS 20B High is roughly 2.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT OSS 20B High also accepts a larger context window (131,072 input tokens), making it the stronger choice for long documents and large codebases.

Based on current benchmark, pricing, and model metadata for 2026.

Choose GPT OSS 20B High

  • cost matters — it's about 2.6x cheaper per token
  • you process long inputs — it offers a 131,072 token context window

Choose LongCat-Flash-Thinking-2601

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • you want the most recent training data — it shipped Jan 2026

At a glance

The differences that matter most.

GPT OSS 20B High
OpenAI
LongCat-Flash-Thinking-2601
Meituan
Benchmark wins
0 of 2
2 of 2
Input price
$0.10 / M
$0.30 / M
Output price
$0.50 / M
$1.20 / M
Context window
131,072
128,000
Released
Aug 2025
Jan 2026
License
Apache 2.0
MIT

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

GPT OSS 20B High outperforms in 0 benchmarks, while LongCat-Flash-Thinking-2601 is better at 2 benchmarks (AIME 2025, GPQA).

LongCat-Flash-Thinking-2601 significantly outperforms across most benchmarks.

Mon Aug 24 2026 • llm-stats.com

Arena Performance

Playground indexes and blind preference scores

Pricing Analysis

Price comparison per million tokens

GPT OSS 20B High costs less

For input processing, GPT OSS 20B High ($0.10/1M tokens) is 3.0x cheaper than LongCat-Flash-Thinking-2601 ($0.30/1M tokens).

For output processing, GPT OSS 20B High ($0.50/1M tokens) is 2.4x cheaper than LongCat-Flash-Thinking-2601 ($1.20/1M tokens).

In conclusion, LongCat-Flash-Thinking-2601 is more expensive than GPT OSS 20B High.*

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

Lowest available price from all providers
Mon Aug 24 2026 • llm-stats.com
OpenAI
GPT OSS 20B High
Input tokens$0.10
Output tokens$0.50
Best providerOpenAI
Meituan
LongCat-Flash-Thinking-2601
Input tokens$0.30
Output tokens$1.20
Best providerMeituan
Notice missing or incorrect data?Start an Issue→

Model Size

Parameter count comparison

539.1B diff

LongCat-Flash-Thinking-2601 has 539.1B more parameters than GPT OSS 20B High, making it 2579.4% larger.

OpenAI
GPT OSS 20B High
20.9Bparameters
Meituan
LongCat-Flash-Thinking-2601
560.0Bparameters
20.9B
GPT OSS 20B High
560.0B
LongCat-Flash-Thinking-2601

Context Window

Maximum input and output token capacity

GPT OSS 20B High accepts 131,072 input tokens compared to LongCat-Flash-Thinking-2601's 128,000 tokens. GPT OSS 20B High can generate longer responses up to 131,072 tokens, while LongCat-Flash-Thinking-2601 is limited to 128,000 tokens.

OpenAI
GPT OSS 20B High
Input131,072 tokens
Output131,072 tokens
Meituan
LongCat-Flash-Thinking-2601
Input128,000 tokens
Output128,000 tokens
Mon Aug 24 2026 • llm-stats.com

License

Usage and distribution terms

GPT OSS 20B High is licensed under Apache 2.0, while LongCat-Flash-Thinking-2601 uses MIT.

License differences may affect how you can use these models in commercial or open-source projects.

GPT OSS 20B High

Apache 2.0

Open weights

LongCat-Flash-Thinking-2601

MIT

Open weights

Release Timeline

When each model was launched

GPT OSS 20B High was released on 2025-08-05, while LongCat-Flash-Thinking-2601 was released on 2026-01-14.

LongCat-Flash-Thinking-2601 is 5 months newer than GPT OSS 20B High.

GPT OSS 20B High

Aug 5, 2025

1.1 years ago

LongCat-Flash-Thinking-2601

Jan 14, 2026

7 months ago

5mo 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

Provider Availability

GPT OSS 20B High is available from OpenAI. LongCat-Flash-Thinking-2601 is available from Meituan.

GPT OSS 20B High

openai logo
OpenAI
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M

LongCat-Flash-Thinking-2601

meituan logo
Meituan
Input Price:Input: $0.30/1MOutput Price:Output: $1.20/1M
* 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 GPT OSS 20B High and LongCat-Flash-Thinking-2601 side-by-side, then vote on the output you prefer.

GPT OSS 20B High
✓ Preferred
LongCat-Flash-Thinking-2601
Open in Playground

FAQ

Common questions about GPT OSS 20B High vs LongCat-Flash-Thinking-2601.

Which is better, GPT OSS 20B High or LongCat-Flash-Thinking-2601?

LongCat-Flash-Thinking-2601 significantly outperforms across most benchmarks. GPT OSS 20B High is made by OpenAI and LongCat-Flash-Thinking-2601 is made by Meituan. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT OSS 20B High compare to LongCat-Flash-Thinking-2601 in benchmarks?

GPT OSS 20B High scores AIME 2025: 98.7%, GPQA: 74.2%. LongCat-Flash-Thinking-2601 scores AIME 2025: 99.6%, Tau2 Telecom: 99.3%, Tau2 Retail: 88.6%, LiveCodeBench: 82.8%, GPQA: 80.5%.

Is GPT OSS 20B High cheaper than LongCat-Flash-Thinking-2601?

GPT OSS 20B High is 3.0x cheaper for input tokens. GPT OSS 20B High costs $0.10/M input and $0.50/M output via openai. LongCat-Flash-Thinking-2601 costs $0.30/M input and $1.20/M output via meituan.

What are the context window sizes for GPT OSS 20B High and LongCat-Flash-Thinking-2601?

GPT OSS 20B High supports 131K tokens and LongCat-Flash-Thinking-2601 supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT OSS 20B High and LongCat-Flash-Thinking-2601?

Key differences include context window (131K vs 128K), input pricing ($0.10 vs $0.30/M), licensing (Apache 2.0 vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT OSS 20B High and LongCat-Flash-Thinking-2601?

GPT OSS 20B High is developed by OpenAI and LongCat-Flash-Thinking-2601 is developed by Meituan.

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