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GPT OSS 20B vs LongCat-2.5

LongCat-2.5 leads the LLM Stats Score 50.0 to 17.4. GPT OSS 20B is 9.1x cheaper per token.

OpenAI · Meituan · Updated for 2026

Which is better?

LongCat-2.5 leads the overall LLM Stats Score 50.0 to 17.4, ranking #20 overall.

On price, GPT OSS 20B is roughly 9.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

LongCat-2.5 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

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

Choose GPT OSS 20B

  • cost matters — it's about 9.1x cheaper per token
  • you need open weights you can self-host or fine-tune

Choose LongCat-2.5

  • overall performance matters — it scores 50.0 and ranks #20 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Nov 2026

At a glance

The differences that matter most.

GPT OSS 20B
OpenAI
LongCat-2.5
Meituan
Core performance indexes
LLM Stats Score
17.4
#254
50.0
#20
Reasoning
14.9
#264
48.3
#21
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.03 / M
$0.30 / M
Output price
$0.14 / M
$1.20 / M
Context window
131,072
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
GPT OSS 20B
LongCat-2.5
Math
16.6#219
37.2#37
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for GPT OSS 20B · 23 for LongCat-2.5

No common benchmarks found

GPT OSS 20B and LongCat-2.5don'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

Pricing Analysis

Price comparison per million tokens

GPT OSS 20B costs less

For input processing, GPT OSS 20B ($0.03/1M tokens) is 10.0x cheaper than LongCat-2.5 ($0.30/1M tokens).

For output processing, GPT OSS 20B ($0.14/1M tokens) is 8.6x cheaper than LongCat-2.5 ($1.20/1M tokens).

In conclusion, LongCat-2.5 is more expensive than GPT OSS 20B.*

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

Lowest available price from all providers
Thu Nov 05 2026 • llm-stats.com
OpenAI
GPT OSS 20B
Input tokens$0.03
Output tokens$0.14
Best providerDeepinfra
Meituan
LongCat-2.5
Input tokens$0.30
Output tokens$1.20
Best providerMeituan
Notice missing or incorrect data?

Model Size

Parameter count comparison

1579.1B diff

LongCat-2.5 has 1579.1B more parameters than GPT OSS 20B, making it 7555.5% larger.

OpenAI
GPT OSS 20B
20.9Bparameters
Meituan
LongCat-2.5
1.6Tparameters
20.9B
GPT OSS 20B
1600.0B
LongCat-2.5

Context Window

Maximum input and output token capacity

LongCat-2.5 accepts 1,048,576 input tokens compared to GPT OSS 20B's 131,072 tokens. Both models can generate responses up to 131,072 tokens.

OpenAI
GPT OSS 20B
Input131,072 tokens
Output131,072 tokens
Meituan
LongCat-2.5
Input1,048,576 tokens
Output131,072 tokens
Thu Nov 05 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

LongCat-2.5 supports multimodal inputs, whereas GPT OSS 20B does not.

LongCat-2.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT OSS 20B

Text
Images
Audio
Video

LongCat-2.5

Text
Images
Audio
Video

Release Timeline

When each model was launched

GPT OSS 20B was released on 2025-08-05, while LongCat-2.5 was released on 2026-11-01.

LongCat-2.5 is 15 months newer than GPT OSS 20B.

GPT OSS 20B

Aug 5, 2025

1.3 years ago

LongCat-2.5

Nov 1, 2026

4 days ago

1.2yr 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 is available from DeepInfra, Novita, Fireworks, Groq, OpenAI. LongCat-2.5 is available from Meituan.

GPT OSS 20B

deepinfra logo
Deepinfra
Input Price:Input: $0.03/1MOutput Price:Output: $0.14/1M
novita logo
Novita
Input Price:Input: $0.05/1MOutput Price:Output: $0.20/1M
fireworks logo
Fireworks
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
groq logo
Groq
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
openai logo
OpenAI
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M

LongCat-2.5

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?

Judge for yourself.

Run your own prompts against GPT OSS 20B and LongCat-2.5 side-by-side, then vote on the output you prefer.

GPT OSS 20B
✓ Preferred
LongCat-2.5
Open in Playground

FAQ

Common questions about GPT OSS 20B vs LongCat-2.5.

Which is better, GPT OSS 20B or LongCat-2.5?

LongCat-2.5 leads the LLM Stats Score 50.0 to 17.4. GPT OSS 20B is made by OpenAI and LongCat-2.5 is made by Meituan. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT OSS 20B compare to LongCat-2.5 in benchmarks?

GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%. LongCat-2.5 scores MathVision: 96.5%, BrowseComp: 91.9%, CharXiv-R: 90.2%, Terminal-Bench 2.1: 88.4%, Video-MME: 85.2%.

Is GPT OSS 20B cheaper than LongCat-2.5?

GPT OSS 20B is 10.0x cheaper for input tokens. GPT OSS 20B costs $0.03/M input and $0.14/M output via deepinfra. LongCat-2.5 costs $0.30/M input and $1.20/M output via meituan.

What are the context window sizes for GPT OSS 20B and LongCat-2.5?

GPT OSS 20B supports 131K tokens and LongCat-2.5 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 GPT OSS 20B and LongCat-2.5?

Key differences include LLM Stats Score (17.4 vs 50.0), context window (131K vs 1.0M), input pricing ($0.03 vs $0.30/M), multimodal support (no vs yes), licensing (Apache 2.0 vs Unknown). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT OSS 20B and LongCat-2.5?

GPT OSS 20B is developed by OpenAI and LongCat-2.5 is developed by Meituan.

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