Sources & verification notes

DeepSeek V4.1 Flash

• Exact identifier & access

  Identity and lifecycle apply to this exact identifier and serving surface.

  • Your First API Call ↗DeepSeek · provider-authored · checked Sep 13, 2026

• First availability

  Effective Sep 10, 2026. Checked Sep 23, 2026.

  The provider changelog documents V4.1 Flash on the API under this name on 2026-09-10.

  • Change Log ↗DeepSeek · provider-authored · checked Sep 23, 2026

• Availability status

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  • Your First API Call ↗DeepSeek · provider-authored · checked Sep 13, 2026

• Availability status

  Effective date not established; this is an observation. Checked Oct 20, 2026.

  Re-checked; the alias now serves DeepSeek-V4.1-Flash-1017 per the pricing page.

  • Models & Pricing ↗DeepSeek · provider-authored · checked Oct 20, 2026

• Capabilities & limits

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  • Models & Pricing ↗DeepSeek · provider-authored · checked Sep 23, 2026

• Capabilities & limits

  Effective date not established; this is an observation. Checked Oct 20, 2026.

  Re-checked against the cited page; unchanged.

  • Models & Pricing ↗DeepSeek · provider-authored · checked Oct 20, 2026

• Input price

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  Derived from the captured rate card's standard token row.

  • Models & Pricing ↗DeepSeek · provider-authored · checked Sep 23, 2026

• Input price

  Effective date not established; this is an observation. Checked Oct 20, 2026.

  Derived from the captured rate card's standard token row.

  • Models & Pricing ↗DeepSeek · provider-authored · checked Oct 20, 2026

• Output price

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  Derived from the captured rate card's standard token row.

  • Models & Pricing ↗DeepSeek · provider-authored · checked Sep 23, 2026

• Output price

  Effective date not established; this is an observation. Checked Oct 20, 2026.

  Derived from the captured rate card's standard token row.

  • Models & Pricing ↗DeepSeek · provider-authored · checked Oct 20, 2026

• Model card

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  Alias; DeepSeek's pricing page lists model version DeepSeek-V4.1-Flash for deepseek-flash on 2026-09-23.

  • DeepSeek-V4.1-Flash Release ↗DeepSeek · provider-authored · checked Sep 23, 2026
  • deepseek-ai/DeepSeek-V4.1-Flash model card ↗DeepSeek · provider-authored · checked Sep 23, 2026
  • Models & Pricing ↗DeepSeek · provider-authored · checked Sep 23, 2026

• Official announcement

  Effective Sep 10, 2026. Checked Sep 23, 2026.

  • Introducing DeepSeek-V4.1-Flash: smarter, faster, more efficient. ↗DeepSeek · provider-authored · checked Sep 23, 2026

• Provider description

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  • DeepSeek-V4.1-Flash Release ↗DeepSeek · provider-authored · checked Oct 1, 2026

• Provider comparison

  Effective date not established; this is an observation. Checked Oct 1, 2026.

  • DeepSeek-V4.1-Flash Release ↗DeepSeek · provider-authored · checked Oct 1, 2026

• Full rate card

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  • Models & Pricing ↗DeepSeek · provider-authored · checked Sep 23, 2026

• Full rate card

  Effective date not established; this is an observation. Checked Oct 20, 2026.

  Re-checked against the cited page; unchanged.

  • Models & Pricing ↗DeepSeek · provider-authored · checked Oct 20, 2026

• License

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  Not verified. These sources establish the identifier, not this missing fact.

  • Your First API Call ↗DeepSeek · provider-authored · checked Sep 13, 2026