References 884% CONFIDENCEOverall confidence: 84%How well the pin's source and references back up its dates.Weighted average of how firmly 8 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

• [1]90%
  deepseek.com/en/news/deepseek-v4-1-flash

  deepseek.com· Posted Sep 28, 2026· Starts Sep 10, 2026 ✓· 13% of score

  DeepSeek's^[3][4] announcement is dated "September 10, 2026" and says "V4.1-Flash is now live on the DeepSeek API"; its API-docs changelog lists "DeepSeek-V4.1-Flash Release 2026/09/10", and Reuters reports DeepSeek "today (10 September) launched DeepSeek-V4.1-Flash".

• [2]80%
  Artificial Analysis: DeepSeek V4.1 Flash (Reasoning, Max Effort), Wayback capture of 11 Sep 2026

  web.archive.org· Added Nov 10, 2026· 15% of score

  Wayback capture dated 2026-09-11 of the original Artificial Analysis page; it reads "It's also notably fast, however very verbose", index 40, 250M tokens generated against a 130M median. Archive capture date, not the review's own publication date.

• [3]90%
  Models & Pricing | DeepSeek API Docs

  api-docs.deepseek.com· Added Sep 28, 2026· 13% of score

  DeepSeek's^[1][4] pricing page gives DeepSeek-V4.1-Flash a 1M context length and 384K maximum output, and per-million-token prices of $0.15 input (cache miss) and $0.60 output off-peak, $0.30 and $1.20 at peak, with peak hours 01:00-04:00 and 06:00-10:00 UTC on weekdays.

• [4]90%
  DeepSeek-V4.1-Flash: Smarter, Faster, More Efficient | DeepSeek API Docs

  api-docs.deepseek.com· Published Sep 10, 2026· Starts Sep 10, 2026· 12% of score

  DeepSeek's^[1][3] developer-docs copy of the announcement, listed as "DeepSeek-V4.1-Flash Release 2026/09/10": the model name deepseek-flash, the retirement of V4-Flash and V4-Flash-Vision-Exp, and "Starting at 04:00 UTC on Sept 14, 2026, all deepseek-v4-pro requests will route to V4.1-Flash at V4.1-Flash rates".

• [5]90%
  deepseek-ai/DeepSeek-V4.1-Flash · Hugging Face

  huggingface.co· Published Sep 10, 2026· 12% of score

  The official model card: 552B backbone parameters, a Causal Encoder-Decoder that activates 8B parameters per token in prefill and 16B in decode, a KV cache of 890 bytes per token, 45T pre-training tokens, the MIT license, and the benchmark table against Opus 5.0, GPT-5.6 Sol, Kimi K3 and GLM-5.3.^[1]

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