{
  "site": "Agentic Weekly",
  "dataset": "Agentic Weekly model facts",
  "as_of": "2026-10-26",
  "license": {
    "name": "CC BY 4.0",
    "url": "https://creativecommons.org/licenses/by/4.0/"
  },
  "attribution": "Data: Agentic Weekly (https://theagenticweekly.com), CC BY 4.0",
  "page": "https://theagenticweekly.com/models",
  "evidence_labels": {
    "Reported": "Read from the cited vendor page on the as-of date; not run by us.",
    "Tested": "We ran it ourselves; scope is stated in tested_note. No model is Tested yet."
  },
  "model": {
    "slug": "deepseek-v4-1-flash-1017",
    "name": "DeepSeek-V4.1-Flash-1017",
    "vendor": "DeepSeek",
    "family": "DeepSeek",
    "category": "llm",
    "status": "generally-available",
    "groups": [
      "open-weights",
      "small-fast",
      "coding"
    ],
    "short_answer": "DeepSeek-V4.1-Flash-1017 is DeepSeek's latest language model in our dataset, released Oct 17, 2026. Open weights (MIT). DeepSeek's Oct 17, 2026 update to V4.1 Flash: MIT-licensed open weights, now served behind the deepseek-flash API name, with shorter outputs and faster task completion than the Sep 10 version. Verified against vendor sources on Oct 26, 2026.",
    "summary": "DeepSeek's Oct 17, 2026 update to V4.1 Flash: MIT-licensed open weights, now served behind the deepseek-flash API name, with shorter outputs and faster task completion than the Sep 10 version.",
    "release_date": "2026-10-17",
    "latest_update": null,
    "api_id": "deepseek-flash",
    "context_tokens": 1000000,
    "max_output_tokens": 384000,
    "input_modalities": [
      "text",
      "image"
    ],
    "output_modalities": [
      "text"
    ],
    "parameters": null,
    "license": "MIT",
    "open_weights": true,
    "pricing": {
      "currency": "CNY",
      "unit": "per 1M tokens",
      "input": 1,
      "output": 4,
      "cachedInput": 0.02,
      "peak": {
        "input": 2,
        "output": 8,
        "cachedInput": 0.04
      },
      "text": "¥1 in / ¥4 out per 1M tokens; peak: ¥2 / ¥8"
    },
    "evidence": "Reported",
    "tested_note": null,
    "last_verified": "2026-10-26",
    "is_stale": false,
    "facts": {
      "release_date": {
        "value": "2026-10-17",
        "source_url": "https://api-docs.deepseek.com/news/news261017/",
        "as_of": "2026-10-26",
        "evidence": "Reported",
        "note": "DeepSeek's release post and changelog entry are dated 2026/10/17."
      },
      "api_id": {
        "value": "deepseek-flash",
        "source_url": "https://api-docs.deepseek.com/updates/",
        "as_of": "2026-10-26",
        "evidence": "Reported",
        "note": "The legacy names deepseek-v4-flash and deepseek-v4-flash-vision-exp are routed to this model."
      },
      "context_tokens": {
        "value": 1000000,
        "source_url": "https://api-docs.deepseek.com/zh-cn/quick_start/pricing",
        "as_of": "2026-10-26",
        "evidence": "Reported"
      },
      "max_output_tokens": {
        "value": 384000,
        "source_url": "https://api-docs.deepseek.com/zh-cn/quick_start/pricing",
        "as_of": "2026-10-26",
        "evidence": "Reported"
      },
      "input_modalities": {
        "value": [
          "text",
          "image"
        ],
        "source_url": "https://api-docs.deepseek.com/zh-cn/quick_start/pricing",
        "as_of": "2026-10-26",
        "evidence": "Reported",
        "note": "Native image understanding per DeepSeek's pricing page."
      },
      "output_modalities": {
        "value": [
          "text"
        ],
        "source_url": "https://api-docs.deepseek.com/zh-cn/quick_start/pricing",
        "as_of": "2026-10-26",
        "evidence": "Reported"
      },
      "license": {
        "value": {
          "type": "open-weights",
          "name": "MIT",
          "openWeights": true
        },
        "source_url": "https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash-1017",
        "as_of": "2026-10-26",
        "evidence": "Reported",
        "note": "License as listed on the Hugging Face model repository."
      },
      "pricing": {
        "value": {
          "currency": "CNY",
          "unit": "per 1M tokens",
          "input": 1,
          "output": 4,
          "cachedInput": 0.02,
          "peak": {
            "input": 2,
            "output": 8,
            "cachedInput": 0.04
          }
        },
        "source_url": "https://api-docs.deepseek.com/zh-cn/quick_start/pricing",
        "as_of": "2026-10-26",
        "evidence": "Reported",
        "note": "Official price list is in CNY. Off-peak shown; peak (Beijing time Mon-Fri 09-12 and 14-18) is double. DeepSeek's Oct 17 release post lists no price change. We do not convert currencies."
      }
    },
    "vendor_claims": [
      "Vendor-reported (DeepSeek, Hugging Face card): Terminal-Bench 4.0 42.3 and DeepSWE v1.1 77.0 for 1017, against 31.2 and 74.2 for the Sep 10 V4.1-Flash. These are vendor-run figures we did not verify."
    ],
    "notes": [
      "This is the same product line as DeepSeek-V4.1-Flash (Sep 10, 2026), which DeepSeek has replaced behind the deepseek-flash API name; we keep the earlier page for history."
    ],
    "not_verified": [
      "DeepSeek says the 1017 update did not change API pricing; we reuse the price list rather than a separate 1017 price page. The official list is in CNY and we do not convert currencies."
    ],
    "sources": [
      {
        "label": "DeepSeek-V4.1-Flash-1017 release post",
        "url": "https://api-docs.deepseek.com/news/news261017/"
      },
      {
        "label": "DeepSeek API updates",
        "url": "https://api-docs.deepseek.com/updates/"
      },
      {
        "label": "DeepSeek pricing (zh-CN)",
        "url": "https://api-docs.deepseek.com/zh-cn/quick_start/pricing"
      },
      {
        "label": "Hugging Face",
        "url": "https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash-1017"
      }
    ],
    "url": "https://theagenticweekly.com/models/deepseek-v4-1-flash-1017",
    "markdown": "https://theagenticweekly.com/models/deepseek-v4-1-flash-1017.md",
    "api": "https://theagenticweekly.com/api/models/deepseek-v4-1-flash-1017"
  }
}