The AI arena is free today

Open Superagent

GPT-5.1 Codex vs LongCat-2.5

LongCat-2.5 leads the LLM Stats Score 50.0 to 29.2. 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 29.2, 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 Codex

  • 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 and coding — 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 Codex
OpenAI
LongCat-2.5
Meituan
Core performance indexes
LLM Stats Score
29.2
#160
50.0
#20
Reasoning
29.4
#154
48.3
#21
Coding
21.1
#116
38.6
#27
Agents
10.2
#150
36.3
#23
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

Individual benchmarks

3 reported for GPT-5.1 Codex · 23 for LongCat-2.5

No common benchmarks found

GPT-5.1 Codex 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 Codex ($1.25/1M tokens) is 4.2x more expensive than LongCat-2.5 ($0.30/1M tokens).

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

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

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

Lowest available price from all providers
Mon Nov 02 2026 • llm-stats.com
OpenAI
GPT-5.1 Codex
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 Codex's 400,000 tokens. LongCat-2.5 can generate longer responses up to 131,072 tokens, while GPT-5.1 Codex is limited to 128,000 tokens.

OpenAI
GPT-5.1 Codex
Input400,000 tokens
Output128,000 tokens
Meituan
LongCat-2.5
Input1,048,576 tokens
Output131,072 tokens
Mon Nov 02 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

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

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

GPT-5.1 Codex

Text
Images
Audio
Video

LongCat-2.5

Text
Images
Audio
Video

Release Timeline

When each model was launched

GPT-5.1 Codex was released on 2025-11-19, while LongCat-2.5 was released on 2026-11-01.

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

GPT-5.1 Codex

Nov 19, 2025

11 months ago

LongCat-2.5

Nov 1, 2026

0 days ago

11mo newer

Knowledge Cutoff

When training data ends

GPT-5.1 Codex has a documented knowledge cutoff of 2024-09-30, while LongCat-2.5's cutoff date is not specified.

We can confirm GPT-5.1 Codex's training data extends to 2024-09-30, but cannot make a direct comparison without LongCat-2.5's cutoff date.

GPT-5.1 Codex

Sep 2024

LongCat-2.5

—

Provider Availability

GPT-5.1 Codex is available from OpenAI. LongCat-2.5 is available from Meituan.

GPT-5.1 Codex

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

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

FAQ

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

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

LongCat-2.5 leads the LLM Stats Score 50.0 to 29.2. GPT-5.1 Codex 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 Codex compare to LongCat-2.5 in benchmarks?

GPT-5.1 Codex scores SWE-Bench Verified: 73.7%, SWE-Lancer: 66.3%, Terminal-Bench 2.0: 52.8%. 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 Codex cheaper than LongCat-2.5?

LongCat-2.5 is 4.2x cheaper for input tokens. GPT-5.1 Codex 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 Codex and LongCat-2.5?

GPT-5.1 Codex 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 Codex and LongCat-2.5?

Key differences include LLM Stats Score (29.2 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 Codex and LongCat-2.5?

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

Related comparisons