---
id: "2026-10-29-deepseek-v5-identifiers-harness-tests"
url: "https://postcutoff.com/e/2026-10-29-deepseek-v5-identifiers-harness-tests/"
as_of: "2026-11-02T13:31:00+01:00"
date: "2026-10-29"
date_precision: day
category: model-release
importance: 2
confidence: medium
status: [Partly confirmed]
sources: 3
editor: human editor
human_review: null
version: "2026-10-29"
---

As of: 2026-11-02 13:31 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2026-10-29-deepseek-v5-identifiers-harness-tests/

# DeepSeek V5 model identifiers appear in tests of DeepSeek's official Harness repository

Full title: DeepSeek V5 model identifiers (deepseek-v5, deepseek-v5-open, deepseek-v5-next) appear in tests of DeepSeek's official Harness repository

TechNode and Pandaily reported on Oct 29, 2026 that three DeepSeek V5 identifiers, deepseek-v5, deepseek-v5-open and deepseek-v5-next, appear in test scenarios for the DeepSeek-account integration of deepseek-ai/deepseek-harness, the company's open-source agent app. One test lets the deepseek-v5-open entry appear next to DeepSeek Flash; the others trigger client-upgrade responses. The tests contain no specifications, benchmarks or release dates, and DeepSeek has announced nothing.

## Key facts
- Where (TechNode): tests of how the Harness client handles model compatibility, i.e. which models appear in its model list and when an upgrade is required
- No specs, benchmark results or schedule are in the code (TechNode); DeepSeek V4.1 Pro, in gray testing since late September, is still not officially released (upcoming item [2026-10-01-deepseek-v4-1-pro-release](https://postcutoff.com/upcoming/#2026-10-01-deepseek-v4-1-pro-release))
- Pandaily's headline adds that V4.1-Flash (1017) leads open-weight models on FrontierCode 2.0 and Artificial Analysis Index v5 (article body not readable for us)
- Not checked by us in the repository itself (GitHub code search needs a login); repository activity is high (dozens of commits a day, ~265k stars)

## What happened

Placeholder names for a fifth-generation DeepSeek model showed up in public test code. Such strings often precede launches, but
they say nothing about timing or capability.

## Why it matters

A DeepSeek V5 would be one of the most watched Chinese releases. The "-open" suffix may point to separate open and hosted versions,
but nothing about the model is confirmed.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): 182 days after its cutoff
- Claude Opus 5.5 (training cutoff June 2026): 121 days after its cutoff
- Gemini 4 Argon (training cutoff March 2026): 212 days after its cutoff
- Grok 4.7 (training cutoff May 2026): 151 days after its cutoff

## Sources

1. [GitHub: deepseek-ai/deepseek-harness](https://github.com/deepseek-ai/deepseek-harness) (github.com, code)
2. [TechNode: DeepSeek V5 identifiers surface in official Harness code repository (Oct 29)](https://technode.com/2026/10/29/deepseek-v5-identifiers-surface-in-official-harness-code-repository/) (technode.com, press)
3. [Pandaily: DeepSeek V5 placeholder IDs show up in Harness code; V4.1-Flash leads open weights on FrontierCode (Oct 29)](https://pandaily.com/deepseek-v5-placeholder-identifiers-harness-code-v4-1-flash-1017-frontiercode-2-0-aa-index-v5) (pandaily.com, press)

## Changes

- 2026-10-29 (filed): Created (TechNode read directly; Pandaily body not readable; news agent)

## Related

- 2026-10-17: [DeepSeek-V4.1-Flash-1017 update: big agentic-coding gains, same price](https://postcutoff.com/e/2026-10-17-deepseek-v4-1-flash-1017/index.md)
- 2026-09-30: [DeepSeek releases Harness v0.2 preview with desktop apps for macOS and Windows](https://postcutoff.com/e/2026-09-30-deepseek-harness-desktop-v0-2/index.md)
- 2026-09-28: [DeepSeek V4.1 Pro enters gray testing as reports say DeepSeek is training a 2T model and planning an 8T one on Huawei chips](https://postcutoff.com/e/2026-09-28-deepseek-v4-1-pro-gray-test/index.md)