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GPT-5.1 Instant vs LongCat-2.5

LongCat-2.5 leads the LLM Stats Score 50.0 to 36.1. LongCat-2.5 is 6.5x cheaper per token.

OpenAI · Meituan · Updated for 2026

Which is better?

LongCat-2.5 leads the overall LLM Stats Score 50.0 to 36.1, ranking #20 overall.

On price, LongCat-2.5 is roughly 6.5x 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-5.1 Instant

  • you want predictable pricing at $1.25/M input and $10.00/M output

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
  • cost matters — it's about 6.5x cheaper per token
  • 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-5.1 Instant
OpenAI
LongCat-2.5
Meituan
Core performance indexes
LLM Stats Score
36.1
#102
50.0
#20
Reasoning
35.8
#101
48.3
#21
Coding
21.5
#112
38.6
#27
Cost, coverage & limits
Benchmark wins
—
—
Input price
$1.25 / M
$0.30 / M
Output price
$10.00 / M
$1.20 / M
Context window
400,000
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
GPT-5.1 Instant
LongCat-2.5
Math
29.9#87
37.2#37
Tool use
16.7#99
30.2#15
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

9 reported for GPT-5.1 Instant · 23 for LongCat-2.5

No common benchmarks found

GPT-5.1 Instant 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

LongCat-2.5 costs less

For input processing, GPT-5.1 Instant ($1.25/1M tokens) is 4.2x more expensive than LongCat-2.5 ($0.30/1M tokens).

For output processing, GPT-5.1 Instant ($10.00/1M tokens) is 8.3x more expensive than LongCat-2.5 ($1.20/1M tokens).

In conclusion, GPT-5.1 Instant is more expensive than LongCat-2.5.*

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

Lowest available price from all providers
Wed Nov 04 2026 • llm-stats.com
OpenAI
GPT-5.1 Instant
Input tokens$1.25
Output tokens$10.00
Best providerOpenAI
Meituan
LongCat-2.5
Input tokens$0.30
Output tokens$1.20
Best providerMeituan
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

LongCat-2.5 accepts 1,048,576 input tokens compared to GPT-5.1 Instant's 400,000 tokens. LongCat-2.5 can generate longer responses up to 131,072 tokens, while GPT-5.1 Instant is limited to 128,000 tokens.

OpenAI
GPT-5.1 Instant
Input400,000 tokens
Output128,000 tokens
Meituan
LongCat-2.5
Input1,048,576 tokens
Output131,072 tokens
Wed Nov 04 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-5.1 Instant and LongCat-2.5 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

GPT-5.1 Instant

Text
Images
Audio
Video

LongCat-2.5

Text
Images
Audio
Video

Release Timeline

When each model was launched

GPT-5.1 Instant was released on 2025-11-12, while LongCat-2.5 was released on 2026-11-01.

LongCat-2.5 is 12 months newer than GPT-5.1 Instant.

GPT-5.1 Instant

Nov 12, 2025

11 months ago

LongCat-2.5

Nov 1, 2026

3 days ago

11mo 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-5.1 Instant is available from OpenAI. LongCat-2.5 is available from Meituan.

GPT-5.1 Instant

openai logo
OpenAI
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M

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-5.1 Instant and LongCat-2.5 side-by-side, then vote on the output you prefer.

GPT-5.1 Instant
✓ Preferred
LongCat-2.5
Open in Playground

FAQ

Common questions about GPT-5.1 Instant vs LongCat-2.5.

Which is better, GPT-5.1 Instant or LongCat-2.5?

LongCat-2.5 leads the LLM Stats Score 50.0 to 36.1. GPT-5.1 Instant 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-5.1 Instant compare to LongCat-2.5 in benchmarks?

GPT-5.1 Instant scores Tau2 Telecom: 95.6%, AIME 2025: 94.0%, BrowseComp Long Context 128k: 90.0%, GPQA: 88.1%, MMMU: 85.4%. 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-5.1 Instant cheaper than LongCat-2.5?

LongCat-2.5 is 4.2x cheaper for input tokens. GPT-5.1 Instant costs $1.25/M input and $10.00/M output via openai. LongCat-2.5 costs $0.30/M input and $1.20/M output via meituan.

What are the context window sizes for GPT-5.1 Instant and LongCat-2.5?

GPT-5.1 Instant supports 400K 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-5.1 Instant and LongCat-2.5?

Key differences include LLM Stats Score (36.1 vs 50.0), context window (400K vs 1.0M), input pricing ($1.25 vs $0.30/M), licensing (Proprietary vs Unknown). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.1 Instant and LongCat-2.5?

GPT-5.1 Instant is developed by OpenAI and LongCat-2.5 is developed by Meituan.

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