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GPT OSS 120B vs LongCat-Flash-Chat

GPT OSS 120B significantly outperforms across most benchmarks. GPT OSS 120B is 2.9x cheaper per token.

OpenAI · Meituan · Updated for 2026

Which is better?

GPT OSS 120B outperforms in 2 benchmarks (GPQA, MMLU), while LongCat-Flash-Chat is better at 0 benchmarks. GPT OSS 120B significantly outperforms across most benchmarks.

On price, GPT OSS 120B is roughly 2.9x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT OSS 120B 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 120B

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • cost matters — it's about 2.9x cheaper per token
  • you process long inputs — it offers a 131,072 token context window

Choose LongCat-Flash-Chat

  • you want the most recent training data — it shipped Aug 2025

At a glance

The differences that matter most.

GPT OSS 120B
OpenAI
LongCat-Flash-Chat
Meituan
Benchmark wins
2 of 2
0 of 2
Input price
$0.09 / M
$0.30 / M
Output price
$0.45 / M
$1.20 / M
Context window
131,072
128,000
Released
Aug 2025
Aug 2025
License
Apache 2.0
MIT

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

GPT OSS 120B outperforms in 2 benchmarks (GPQA, MMLU), while LongCat-Flash-Chat is better at 0 benchmarks.

GPT OSS 120B significantly outperforms across most benchmarks.

Tue Aug 25 2026 • llm-stats.com

Arena Performance

Playground indexes and blind preference scores

Pricing Analysis

Price comparison per million tokens

GPT OSS 120B costs less

For input processing, GPT OSS 120B ($0.09/1M tokens) is 3.3x cheaper than LongCat-Flash-Chat ($0.30/1M tokens).

For output processing, GPT OSS 120B ($0.45/1M tokens) is 2.7x cheaper than LongCat-Flash-Chat ($1.20/1M tokens).

In conclusion, LongCat-Flash-Chat is more expensive than GPT OSS 120B.*

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

Lowest available price from all providers
Tue Aug 25 2026 • llm-stats.com
OpenAI
GPT OSS 120B
Input tokens$0.09
Output tokens$0.45
Best providerDeepinfra
Meituan
LongCat-Flash-Chat
Input tokens$0.30
Output tokens$1.20
Best providerMeituan
Notice missing or incorrect data?Start an Issue→

Model Size

Parameter count comparison

443.2B diff

LongCat-Flash-Chat has 443.2B more parameters than GPT OSS 120B, making it 379.5% larger.

OpenAI
GPT OSS 120B
116.8Bparameters
Meituan
LongCat-Flash-Chat
560.0Bparameters
116.8B
GPT OSS 120B
560.0B
LongCat-Flash-Chat

Context Window

Maximum input and output token capacity

GPT OSS 120B accepts 131,072 input tokens compared to LongCat-Flash-Chat's 128,000 tokens. GPT OSS 120B can generate longer responses up to 131,072 tokens, while LongCat-Flash-Chat is limited to 128,000 tokens.

OpenAI
GPT OSS 120B
Input131,072 tokens
Output131,072 tokens
Meituan
LongCat-Flash-Chat
Input128,000 tokens
Output128,000 tokens
Tue Aug 25 2026 • llm-stats.com

License

Usage and distribution terms

GPT OSS 120B is licensed under Apache 2.0, while LongCat-Flash-Chat uses MIT.

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

GPT OSS 120B

Apache 2.0

Open weights

LongCat-Flash-Chat

MIT

Open weights

Release Timeline

When each model was launched

GPT OSS 120B was released on 2025-08-05, while LongCat-Flash-Chat was released on 2025-08-29.

LongCat-Flash-Chat is 1 month newer than GPT OSS 120B.

GPT OSS 120B

Aug 5, 2025

1.1 years ago

LongCat-Flash-Chat

Aug 29, 2025

12 months ago

3w 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 120B is available from DeepInfra, Novita, OpenAI, Fireworks, Groq. LongCat-Flash-Chat is available from Meituan.

GPT OSS 120B

deepinfra logo
Deepinfra
Input Price:Input: $0.09/1MOutput Price:Output: $0.45/1M
novita logo
Novita
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
fireworks logo
Fireworks
Input Price:Input: $0.15/1MOutput Price:Output: $0.60/1M
groq logo
Groq
Input Price:Input: $0.15/1MOutput Price:Output: $0.60/1M

LongCat-Flash-Chat

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 120B and LongCat-Flash-Chat side-by-side, then vote on the output you prefer.

GPT OSS 120B
✓ Preferred
LongCat-Flash-Chat
Open in Playground

FAQ

Common questions about GPT OSS 120B vs LongCat-Flash-Chat.

Which is better, GPT OSS 120B or LongCat-Flash-Chat?

GPT OSS 120B significantly outperforms across most benchmarks. GPT OSS 120B is made by OpenAI and LongCat-Flash-Chat is made by Meituan. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT OSS 120B compare to LongCat-Flash-Chat in benchmarks?

GPT OSS 120B scores MMLU: 90.0%, CodeForces: 82.1%, GPQA: 80.1%, TAU-bench Retail: 67.8%, HealthBench: 57.6%. LongCat-Flash-Chat scores MATH-500: 96.4%, MMLU: 89.7%, IFEval: 89.6%, ZebraLogic: 89.3%, HumanEval: 88.4%.

Is GPT OSS 120B cheaper than LongCat-Flash-Chat?

GPT OSS 120B is 3.3x cheaper for input tokens. GPT OSS 120B costs $0.09/M input and $0.45/M output via deepinfra. LongCat-Flash-Chat costs $0.30/M input and $1.20/M output via meituan.

What are the context window sizes for GPT OSS 120B and LongCat-Flash-Chat?

GPT OSS 120B supports 131K tokens and LongCat-Flash-Chat 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 120B and LongCat-Flash-Chat?

Key differences include context window (131K vs 128K), input pricing ($0.09 vs $0.30/M), licensing (Apache 2.0 vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT OSS 120B and LongCat-Flash-Chat?

GPT OSS 120B is developed by OpenAI and LongCat-Flash-Chat is developed by Meituan.

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