LongCat-2.0 and DeepSeek-V4 Preview: Documented Access and Integration Differences
A source-based comparison of documented access methods, API formats, context windows, agent integrations, and license terms for LongCat-2.0 and DeepSeek-V4 Preview. Not a performance comparison.
Independent third-party resource. Not affiliated with or endorsed by LongCat, Meituan, DeepSeek, or any other publisher discussed on this page.
Published: 2026-07-21
Different publishers, different model families
LongCat-2.0 is a model published by the LongCat team and documented in the meituan-longcat GitHub organization. DeepSeek-V4 Preview is a model published by DeepSeek and documented on the DeepSeek API platform. They are products of different organizations with separate release timelines, API platforms, and documentation.
This page compares only what each publisher publicly documents about access methods, API formats, context windows, agent integrations, and license or weight availability. It is not an independent performance comparison, and it does not state which model is better, faster, or more capable.
Documented access and integration comparison
| Dimension | LongCat-2.0 | DeepSeek-V4 Preview |
|---|---|---|
| Publisher-documented model status | Stable | Preview |
| Model variants | One variant: LongCat-2.0 (1.6T total, ~48B active) | Two variants: V4-Pro (1.6T total, 49B active) and V4-Flash (284B total, 13B active) |
| Context window | 1,000,000 tokens; maximum output 128,000 tokens | 1,000,000 tokens, described as the default across all DeepSeek services |
| API formats documented | OpenAI-compatible (chat completions), Anthropic-compatible (messages) | OpenAI ChatCompletions, Anthropic API |
| Claude Code or agent integration mentioned by publisher | Claude Code, OpenClaw, Hermes (per GitHub README) | Claude Code, OpenClaw, OpenCode, GitHub Copilot (per API documentation and release notes) |
| Weight availability or license | Open weights under MIT License (per LICENSE file in GitHub repository) | Open weights available on Hugging Face; a technical report is published (per publisher release page) |
| What this site has not independently tested | This site has not run either model through any benchmark, agent task, or integration scenario. It has not measured latency, throughput, task success rate, code quality, or any other performance metric. All facts in this table are sourced from the cited publisher documentation and have not been independently verified. | |
Source basis for each dimension
The table above is compiled from two sets of publisher documentation, read on 2026-07-21:
- LongCat-2.0: GitHub README (meituan-longcat/LongCat-2.0) for architecture, license, and agent integration mentions. Publisher API documentation (API Overview) for endpoints, authentication, and context window limits.
- DeepSeek-V4 Preview: Publisher preview release page (April 24, 2026) for variants, parameters, context window, API formats, and agent integrations. Publisher API documentation (First API Call) for model IDs and base URLs.
Where the publisher documentation does not state a value, the corresponding table cell reads “Not documented in the cited source.” No information has been inferred from third-party sources.
What this page does not do
- It does not compare performance, benchmark scores, latency, cost efficiency, code quality, or user experience.
- It does not state which model is better, faster, cheaper, or recommended.
- It does not reproduce vendor-reported benchmark numbers or performance claims.
- It does not suggest that the two models are interchangeable or direct competitors.
This page is not an independent performance comparison. It reports what each publisher's documentation states about access methods, API formats, context windows, agent integrations, and license terms. No testing has been conducted by this site.
Related pages
- LongCat-2.0 model profile
Verified source links and documented access options for LongCat-2.0.
- How to Use LongCat-2.0 with Claude Code
Independent guide for pointing Claude Code at the LongCat API.
- LongCat-2.0 and Claude Code: Model, Tool, and Workflow Differences
An independent explainer on the different roles of LongCat-2.0 and Claude Code.
- About this site
Background on how this independent third-party site sources, verifies, and discloses its content.
Sources
- LongCat-2.0 GitHub Repository
Primary sourceAccessed 2026-07-21
Primary repository for LongCat-2.0 model card, MIT license, architecture description, and deployment instructions.
- LongCat API Overview
Publisher documentationAccessed 2026-07-21
Publisher documentation for the LongCat API base URL, authentication, endpoints, and SDK compatibility.
- DeepSeek-V4 Preview Release
Publisher documentationAccessed 2026-07-21
Publisher announcement for DeepSeek-V4 Preview, including model variants, parameters, context window, API formats, and legacy model retirement timeline.
- DeepSeek API Documentation
Publisher documentationAccessed 2026-07-21
Publisher API documentation listing current model IDs, base URLs, agent integrations, and the legacy model deprecation schedule.
Independent third-party disclosure
This page is published by an independent third-party site. It is not affiliated with, endorsed by, sponsored by, or operated by Meituan, LongCat, or any of their affiliates. The content summarizes publicly-available primary documentation and does not represent the views of any referenced organization.
Last reviewed: 2026-07-21